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  1. NASA project:
  2.  
  3.  Horizons On-Line System News
  4.  
  5.  Nov 10:
  6.  
  7.     -- Jovian satellites 2010J1 and 2010J2 have been updated to new trajectory
  8.  
  9.         solution JUP286 from R. Jacobson (JPL).
  10.  
  11.  
  12.  
  13.  Nov 09:
  14.  
  15.     -- Phobos-Soil_1 and Phobos-Soil_2 TLE-based trajectories have been added,
  16.  
  17.         replacing "Phobos-Soil". These two objects were found to be on
  18.  
  19.         trajectories similar to the Earth-orbiting parking trajectory of the
  20.  
  21.         original spacecraft. It is thought the engine firing did not occur.
  22.  
  23.  
  24.  
  25.        Efforts are underway to recover the spacecraft and reattempt the
  26.  
  27.         interplanetary injection phase if possible. However, battery power
  28.  
  29.         may be depleted in the next few days (~Nov 11-15).
  30.  
  31.  
  32.  
  33.        To obtain Earth shadow entrance/exit (eclipse) information for the
  34.  
  35.         objects from Horizons (as with Hubble & ISS), select an object as  
  36.  
  37.         the target, then the Moon as coordinate center ("@301"). Then
  38.  
  39.         request "observer table" quantity #12, "satellite angular separation
  40.  
  41.         and visibility".
  42.  
  43.  
  44.  
  45.        A marker code of "/u" will be displayed when the object is in umbral
  46.  
  47.         eclipse. You would probably want to use a fine time-step of 1 minute
  48.  
  49.         or less when generating such information.
  50.  
  51.  
  52.  
  53.  Nov 04:
  54.  
  55.     -- Daytime object 2005 YU55 was successfully acquired by Goldstone radar.
  56.  
  57.         The orbit solution has been updated to #72, based on the delay-Doppler
  58.  
  59.         measurements, and can be retrieved here. Trajectory uncertainties are
  60.  
  61.         reduced ~75% with these initial measurements.
  62.  
  63.  
  64.  
  65.        A 2nd orbit radar-update (prior to optical visibility) is expected to be
  66.  
  67.         available around Nov 7 00:00 UTC, reducing uncertainties further.
  68.  
  69.  
  70.  
  71.  Nov 03:
  72.  
  73.     -- We plan to have an orbit solution update for 2005 YU55 based on
  74.  
  75.         Goldstone radar astrometry by about Nov 4, 20:35 UTC. This daylight
  76.  
  77.         object won't be visible until after it's Nov 8 0.85 lunar-distance
  78.  
  79.         approach.
  80.  
  81.     -- Spektr-R was updated from an official trajectory (not TLEs) provided
  82.  
  83.         by Russia's IKI.
  84.  
  85.  
  86.  
  87.  Horizons On-Line System News
  88.  
  89.  Nov 10:
  90.  
  91.     -- Jovian satellites 2010J1 and 2010J2 have been updated to new trajectory
  92.  
  93.         solution JUP286 from R. Jacobson (JPL).
  94.  
  95.  
  96.  
  97.  Nov 09:
  98.  
  99.     -- Phobos-Soil_1 and Phobos-Soil_2 TLE-based trajectories have been added,
  100.  
  101.         replacing "Phobos-Soil". These two objects were found to be on
  102.  
  103.         trajectories similar to the Earth-orbiting parking trajectory of the
  104.  
  105.         original spacecraft. It is thought the engine firing did not occur.
  106.  
  107.  
  108.  
  109.        Efforts are underway to recover the spacecraft and reattempt the
  110.  
  111.         interplanetary injection phase if possible. However, battery power
  112.  
  113.         may be depleted in the next few days (~Nov 11-15).
  114.  
  115.  
  116.  
  117.        To obtain Earth shadow entrance/exit (eclipse) information for the
  118.  
  119.         objects from Horizons (as with Hubble & ISS), select an object as  
  120.  
  121.         the target, then the Moon as coordinate center ("@301"). Then
  122.  
  123.         request "observer table" quantity #12, "satellite angular separation
  124.  
  125.         and visibility".
  126.  
  127.  
  128.  
  129.        A marker code of "/u" will be displayed when the object is in umbral
  130.  
  131.         eclipse. You would probably want to use a fine time-step of 1 minute
  132.  
  133.         or less when generating such information.
  134.  
  135.  
  136.  
  137.  Nov 04:
  138.  
  139.     -- Daytime object 2005 YU55 was successfully acquired by Goldstone radar.
  140.  
  141.         The orbit solution has been updated to #72, based on the delay-Doppler
  142.  
  143.         measurements, and can be retrieved here. Trajectory uncertainties are
  144.  
  145.         reduced ~75% with these initial measurements.
  146.  
  147.  
  148.  
  149.        A 2nd orbit radar-update (prior to optical visibility) is expected to be
  150.  
  151.         available around Nov 7 00:00 UTC, reducing uncertainties further.
  152.  
  153.  
  154.  
  155.  Nov 03:
  156.  
  157.     -- We plan to have an orbit solution update for 2005 YU55 based on
  158.  
  159.         Goldstone radar astrometry by about Nov 4, 20:35 UTC. This daylight
  160.  
  161.         object won't be visible until after it's Nov 8 0.85 lunar-distance
  162.  
  163.         approach.
  164.  
  165.     -- Spektr-R was updated from an official trajectory (not TLEs) provided
  166.  
  167.         by Russia's IKI.
  168.  
  169. Oct 12, 2011:
  170.  
  171.     -- The Phobos-Soil trajectory was extended to Mars encounter.
  172.  
  173.  
  174.  
  175.  Oct 10, 2011:
  176.  
  177.     -- The Phobos-Soil spacecraft's planning trajectory for Nov 8 launch from
  178.  
  179.         Baikonur (Russia) is now available. The Russian Space Research
  180.  
  181.         Institute has expressed interest in astrometry and imaging of Earth
  182.  
  183.         departure, especially engine burns to occur over South America.
  184.  
  185.  
  186.  
  187.  Oct 04, 2011:
  188.  
  189.     -- Spektr-R space telescope trajectory was added
  190.  
  191.     -- Hubble Space Telescope trajectory was updated
  192.  
  193.     -- GRAIL's second stage trajectory was updated
  194.  
  195.  
  196.  
  197.  Sep 14, 2011:
  198.  
  199.     -- GRAIL A & B trajectories been updated with post-launch data-fits.
  200.  
  201.  
  202.  
  203.  Sep 10, 2011:
  204.  
  205.     -- GRAIL launched at the second window of the day; the relevant trajectory
  206.  
  207.         prediction files are now in Horizons.
  208.  
  209.  
  210.  
  211.  Sep 08, 2011:
  212.  
  213.     -- Pre-launch trajectories for Moon-bound GRAIL-A, GRAIL-B and the second
  214.  
  215.         stage (GRAIL-SS) are now up on Horizons for the Saturday Sep 10 launch
  216.  
  217.         window #1.
  218.  
  219.  
  220.  
  221.         If launch is delayed, the on-line trajectories will be updated as soon
  222.  
  223.         as possible.
  224.  
  225. Sep 02, 2011:
  226.  
  227.     -- Saturnian satellite 2010J1 and 2010J2 trajectories have been updated
  228.  
  229.         to a new solution fit to data through Aug 2011 from M. Brozovic (JPL).
  230.  
  231.     -- Cassini reference trajectory has been updated.
  232.  
  233.     -- ARTEMIS trajectories are back and current as far as they go.
  234.  
  235.         A prediction interval will be added in a week or so.
  236.  
  237.     -- Hope to have GRAIL prior to launch, but it is still pending.
  238.  
  239.  
  240.  
  241.  Aug 15, 2011:
  242.  
  243.     -- Pluto system ephemerides (planet center and 4 satellites) have been
  244.  
  245.         updated to solution PLU021 (M. Brozovic, JPL)
  246.  
  247.  
  248.  
  249.  Aug 09, 2011
  250.  
  251.     -- Telnet screen sizing on the new server has been fixed. Horizons now also
  252.  
  253.         dynamically recognizes window size changes.
  254.  
  255.  
  256.  
  257.        For those accessing by script, the TERM= "no-resize-vt100" environment
  258.  
  259.         variable isn't used anymore. A subset of RFC 854 and 1073 standards
  260.  
  261.         has been implemented. This means an initial control-byte negotiation
  262.  
  263.         occurs. This should be invisible to your script, if you are letting
  264.  
  265.         telnet handle the connection.
  266.  
  267.  
  268.  
  269.  
  270.  
  271. Aug 01, 2011
  272.  
  273.     -- Welcome to the new server. The SunFire V250, in service since 2004,
  274.  
  275.         fades to black.
  276.  
  277.  
  278.  
  279.        One still-unresolved issue affects telnet users, preventing automatic
  280.  
  281.         initial screen sizing.
  282.  
  283.  
  284.  
  285.         Until fixed, you may have to manually tell the system your screen
  286.  
  287.         dimensions (if the 24 x 79 default isn't OK) by typing in the command:
  288.  
  289.  
  290.  
  291.                            tty {rows} {columns}
  292.  
  293.  
  294.  
  295.         ... at the main "Horizons>" prompt. For example, "tty 33 101" tells
  296.  
  297.         the system your window has 33 rows and 101 columns.
  298.  
  299.  
  300.  
  301.  Jul 27, 2011
  302.  
  303.     -- Hardware upgrade means HORIZONS will be unavailable for a short time
  304.  
  305.         early next week. When we come back, we should be >10x faster.
  306.  
  307.  
  308.  
  309.        Nominal planning is for downtime Monday Aug 1 within the span
  310.  
  311.        16:00-20:00 UTC (~ 9 am to 1 pm west coast Pasadena time in the US).
  312.  
  313.        Probably a sub-interval of that span, if no surprises.
  314.  
  315.  
  316.  
  317.        Addresses affected are "ssd.jpl.nasa.gov", "neo.jpl.nasa.gov", and
  318.  
  319.        "iau-comm4.jpl.nasa.gov". All functions they provide will be temporarily
  320.  
  321.        unavailable.
  322.  
  323.  
  324.  
  325.  Jul 21, 2011
  326.  
  327.     -- Newly discovered Pluto satellite, provisionally designated
  328.  
  329.         S/2011 (134340) 1 and reported in CBAT 2769 is now available based
  330.  
  331.         on orbit solution by M. Brozovic (JPL). Access on Horizons using
  332.  
  333.         ID code "904".
  334.  
  335.  
  336.  
  337.  Jul 18, 2011
  338.  
  339.     -- The pre-launch Juno spacecraft trajectory has been updated for the
  340.  
  341.         August 5 opening of the launch window.
  342.  
  343.     -- A post-capture trajectory for the Dawn spacecraft at Vesta is now
  344.  
  345.         available.
  346.  
  347.  
  348.  
  349.  
  350.  
  351.  Jun 17, 2011
  352.  
  353.     -- Version 3.40:
  354.  
  355.         Output-stepping based on angular motion (instead of time) can now
  356.  
  357.         handle cases with user-specified elevation angle limits (rise/set).
  358.  
  359.          
  360.  
  361.  May 28, 2011
  362.  
  363.     -- Jupiter satellite solution JUP282 (R. Jacobson, JPL) is now used for
  364.  
  365.         bodies 506-513,517-550, and 55060-55073.
  366.  
  367.  
  368.  
  369.         Satellites 2010 J1 and 2010 J2, two recently discovered Jovian
  370.  
  371.         irregulars, are now available with the temporary numbering of
  372.  
  373.         55072= 2010J1 and 55073= 2010J2.
  374.  
  375.  
  376.  
  377.  May 25, 2011
  378.  
  379.     -- System was down for ~5 minute fan replacement
  380.  
  381.  
  382.  
  383.  Mar 18, 2011:
  384.  
  385.     -- Saturnian satellite trajectories for 610-611, 615-618, 633-635, 649, and
  386.  
  387.         653 were updated to use the new SAT342 solution from R. Jacobson (JPL),
  388.  
  389.         reflecting Cassini spacecraft tracking data through November 2009.
  390.  
  391.     -- The Horizons telnet interface was altered to support name searches for
  392.  
  393.         small-bodies having an apostrophe in the name. E-mail requests can
  394.  
  395.         enclose the look-up command in double-quotes:
  396.  
  397.  
  398.  
  399.         COMMAND= "O'Connell;"
  400.  
  401.    
  402.  
  403.  Feb 15, 2011:
  404.  
  405.     -- WISE STATUS: No further updates to the Earth-orbiting WISE trajectory
  406.  
  407.         will be made on Horizons. The last communication pass will occur from
  408.  
  409.         11:35 a.m. to noon (PST) on 17 Feb 2011. During this pass, the s/c
  410.  
  411.         transmitter will be turned off, ending mission operations and
  412.  
  413.         navigation support. TLEs may be obtained from USSTRATCOM or other
  414.  
  415.         public sites to derive future spacecraft location data.
  416.  
  417.     -- Constellation boundaries have been updated to use two more digits of
  418.  
  419.         precision for sub 0.1-arcsecond specification.
  420.  
  421.  
  422.  
  423.  Feb 10, 2011:
  424.  
  425.     -- The MESSENGER spacecraft trajectory was updated for the March 18
  426.  
  427.         Mercury orbit insertion.
  428.  
  429.  
  430.  
  431.  Jan 31, 2011:
  432.  
  433.     -- Both the NExT spacecraft (formerly Stardust Bus) and 9P/Tempel 1 comet
  434.  
  435.        trajectories have been updated for the 200 km Tempel 1 comet flyby on
  436.  
  437.        2011-Feb-15 04:39:16 UTC.
  438.  
  439.  
  440.  
  441.        To obtain an ephemeris relative to the comet Tempel 1 navigation
  442.  
  443.        solution (s11025p_s89g), set center as "@1000093".  Conversely, to
  444.  
  445.        obtain an ephemeris of the comet relative to NExT s/c, set target
  446.  
  447.        "1000093" and set center "@next".
  448.  
  449.  
  450.  
  451.        The above will access precomputed trajectories as released by the NExT
  452.  
  453.        navigation team.  If you aren't concerned with encounter details, you
  454.  
  455.        can request 9P/Tempel 1 from the comet database as usual for a
  456.  
  457.        numerically integrated version and predicts over longer time-spans.
  458.  
  459.  
  460.  
  461.        The current best global solution is K053/25, with an epoch of 2003.
  462.  
  463.        This, or follow-ons to come, should be used for non-spacecraft purposes.
  464.  
  465.  
  466.  
  467.        There is a solution #91 (epoch 2010) adequate for the 2011 NExT
  468.  
  469.        encounter, but less good than K053/25 for times away from that epoch.
  470.  
  471.        Also, FYI, earlier solution K051/22 has an epoch of 2006, and was a
  472.  
  473.        fit keyed to the 2005 Deep Impact ecnounter but is not as good for
  474.  
  475.        times away from that event as K053/25 or #91.
  476.  
  477.  
  478.  
  479.  
  480.  
  481. Dec 17, 2010:
  482.  
  483.     -- The Planet-C (Akatsuki) trajectory was updated to reflect the failure
  484.  
  485.         to achieve Venus orbit insertion Dec 7. No new trajectory updates
  486.  
  487.         are expected here, though they may resume in future years if there is
  488.  
  489.         further spacecraft activity.
  490.  
  491.  
  492.  
  493.  Dec 13, 2010:
  494.  
  495.     -- The Swift Earth-orbiting gamma-ray burst observatory has been added.
  496.  
  497.         Future trajectory updates will be at user request.
  498.  
  499.  
  500.  
  501.  Dec 06, 2010:      
  502.  
  503.     -- Most NEO orbits in Horizons were recomputed based on debiased optical
  504.  
  505.        astrometry as described Icarus 210 (2010) 158-181, "Treatment of star
  506.  
  507.        catalog biases in asteroid astrometric observations", Chesley SR,
  508.  
  509.        Baer J, Monet DB.
  510.  
  511.  
  512.  
  513.        The refinement aims to compensate astrometric measurements for small
  514.  
  515.        systematic errors (generally 10's of mas level) in background star
  516.  
  517.        catalog positions. This usually amounts to position changes for the
  518.  
  519.        new solutions well within the noise-level of prior orbit solution
  520.  
  521.        uncertainties.
  522.  
  523.  
  524.  
  525.  Oct 22, 2010:
  526.  
  527.     -- Uranian satellites 716-724 and planet center (799) have been updated to
  528.  
  529.         the latest satellite solution URA095 from M. Brozovic (JPL).
  530.  
  531.        Neptunian satellites 809-813 have also been updated to new solution
  532.  
  533.         NEP085 from M. Brozovic (JPL).
  534.  
  535.  
  536.  
  537.  Oct 16, 2010:
  538.  
  539.     -- Updated to latest Saturnian satellite solution SAT314 from R. Jacobson
  540.  
  541.         (JPL). Objects affected are: 619-631, 636-652, 2004S7, 2004S12,
  542.  
  543.         2004S13, 2004S17, 2006S1, 2006S3, 2007S2, 2007S3.
  544.  
  545.  
  546.  
  547.  Sep 09, 2010:
  548.  
  549.     -- Satellite solution JUP230 was extended to span 1600 to 2500 for objects
  550.  
  551.         Io (501), Europa (502), Ganymede (503), Callisto (504), Amalthea (505)
  552.  
  553.         and Jupiter planet center (599)
  554.  
  555.  
  556.  
  557. Aug 19, 2010:
  558.  
  559.     -- If you don't get a response from the e-mail batch system, it is likely
  560.  
  561.         your e-mail program isn't set to send "plain-text" ASCII (7-bit).
  562.  
  563.         A helpful guide to suitably configuring various mailers is here:
  564.  
  565.  
  566.  
  567.               http://stagecraft.theprices.net/nomime.html
  568.  
  569.  
  570.  
  571.        Modern e-mail sw increasingly assumes it is communicating with other
  572.  
  573.        systems like itself, so automatically encodes outgoing e-mail with font
  574.  
  575.        codes, formatting symbols, and MIME attachments.  An elaborate front-end
  576.  
  577.        is needed to interpret all this, which Horizons does not yet have. For
  578.  
  579.        example, it may seem that your command file clearly says
  580.  
  581.    
  582.  
  583.            EMAIL_ADDR= 'you@your.computer.com'
  584.  
  585.  
  586.  
  587.        ... but your e-mail software, if not set appropriately, reworks it such
  588.  
  589.        that it arrives here looking like
  590.  
  591.  
  592.  
  593.            EMAIL_ADDR =3D =E2=80=98you@your.computer.com=E2=80=99=20
  594.  
  595.  
  596.  
  597.        ... which Horizons can't interpret, hence can't send an error message
  598.  
  599.        back to, hence no response. The issue is being looked at, but for now
  600.  
  601.        the simplest fix is if users handle it on their end by setting their
  602.  
  603.        e-mail software to send ASCII 7-bit plain-text (no MIME).
  604.  
  605.  
  606.  
  607.  Aug 02, 2010:
  608.  
  609.     -- DAWN spacecraft trajectory has been updated. Chandra, Herschel, Planck,
  610.  
  611.         and WISE are updated regularly (weekly or monthly), the others as
  612.  
  613.         requested or necessary.
  614.  
  615.        
  616.  
  617.  Jul 12, 2010:
  618.  
  619.     -- Kepler spacecraft trajectory updated, including predicts to 2015.
  620.  
  621.        Uranian satellites Perdita, Mab, and Cupid were extended to 2050
  622.  
  623.         (same URA074 solution).
  624.  
  625.  
  626.  
  627. Jun 30, 2010:
  628.  
  629.     -- USAGE NOTE: to produce a close-approach table using the e-mail "batch"
  630.  
  631.         interface, set MAKE_EPHEM= 'YES' and TABLE_TYPE= 'APPROACH'.
  632.  
  633.  
  634.  
  635.               ftp://ssd.jpl.nasa.gov/pub/ssd/horizons_batch_example.long
  636.  
  637.  
  638.  
  639.         ... has been updated to indicate this.
  640.  
  641.  
  642.  
  643.  Jun 28, 2010:
  644.  
  645.     -- The Rosetta spacecraft trajectory was updated for the flyby of asteroid
  646.  
  647.         21 Lutetia on Saturday July 10 @ 15:44:45 UTC (event time), at a
  648.  
  649.         distance from Lutetia center of ~3230 km with a speed of 15 km/s.
  650.  
  651.  
  652.  
  653.  Jun 24, 2010:
  654.  
  655.     -- The final EPOXI trajectory release from JPL navigation prior to Earth
  656.  
  657.         flyby is now in Horizons. The closest approach will be 2010-Jun-27
  658.  
  659.         22:03:48 UTC, 36859 km over the mid South Atlantic Ocean, closer to
  660.  
  661.         Antarctica than South America or Africa.
  662.  
  663.  
  664.  
  665.  Jun 12, 2010:
  666.  
  667.     -- The final Hayabusa trajectory prediction is now available for the Jun 13
  668.  
  669.         return to Earth (Australia). Lighting is not favorable, but observers
  670.  
  671.         in the Maldives should have a good view just after sunset (and of the
  672.  
  673.         spacecraft too).
  674.  
  675.  
  676.  
  677.  May 28, 2010:
  678.  
  679.     -- Spacecraft trajectories have been added for Planet-C (Venus Climate
  680.  
  681.         Orbiter, VCO), and the ARTEMIS-P1 and ARTEMIS-P2 spacecraft headed
  682.  
  683.         to Earth-Moon L1/L2.
  684.  
  685.  
  686.  
  687.  Mar 18, 2010:
  688.  
  689.     -- The Mercury rotation model was update to use the published version of
  690.  
  691.          Margot, J.L., (2009). "A new orientation model for Mercury,"
  692.  
  693.          Celestial Mechanics and Dynamical Astronomy, v.105, no.4, pp. 329-336.
  694.  
  695.  
  696.  
  697.  Feb 23, 2010:
  698.  
  699.     -- A trajectory for Lunar Reconnaissance Orbiter (LRO) spacecraft is now
  700.  
  701.         available. Spacecraft ID is -85.
  702.  
  703.  
  704.  
  705.  
  706.  
  707.  Feb 03, 2010:
  708.  
  709.     -- The interplanetary planning trajectory for spacecraft Hayabusa's return
  710.  
  711.         to Earth (June 2010) is now available. Entry/descent/landing trajectory
  712.  
  713.         is not available at this time.
  714.  
  715.  
  716.  
  717.  Jan 20, 2010:
  718.  
  719.     -- Pluto system (901-903,999) has been extended to cover 1900-2051
  720.  
  721.         with the same PLU017 solution.
  722.  
  723.        Jovian satellites and planet center (501-505,514,599) have been
  724.  
  725.         extended to cover 1900-2100 with the same JUP230 solution.
  726.  
  727.  
  728.  
  729.  Jan 15, 2010:
  730.  
  731.     -- Mars system (401,402,499) ephemerides have been updated to new solution
  732.  
  733.         MAR085 (R. Jacobson, JPL) as described in Astronomical Journal (AJ),
  734.  
  735.         139 (2010) 668-679.
  736.  
  737.  
  738.  
  739.  Jan 13, 2010:
  740.  
  741.     -- The Pluto ephemeris is currently PLU017 (indicated on output) -- since
  742.  
  743.         the 2007-Jun-20 announcement for Nix and Hydra satellite updates.
  744.  
  745.  
  746.  
  747.  Dec 17, 2009:
  748.  
  749.     -- Jupiter planet (599) and satellites 528-538 were updated to orbit
  750.  
  751.         solution JUP269; satellites 539-549 were updated to JUP268, and
  752.  
  753.         provisional objects 55060-55071 updated to JUP270. "Herse" (550),
  754.  
  755.         formerly known only as S/2003 J14, was newly numbered and named under
  756.  
  757.         JUP270. All solutions are from R. Jacobson (JPL) who comments
  758.  
  759.         "Merry Christmas" [ed.: indeed]; some provisional (5-digit) number
  760.  
  761.         assignments were switched around, so it is best to access using the
  762.  
  763.         object designation.
  764.  
  765.  
  766.  
  767.  Dec 16, 2009:
  768.  
  769.     -- The initial post-launch WISE spacecraft trajectory is now available
  770.  
  771.         (Earth orbiting).
  772.  
  773.  
  774.  
  775.  Dec 14, 2009:
  776.  
  777.     -- The SOHO spacecraft trajectory (near L1) is now available, beginning
  778.  
  779.         with 2008-Jun-1. Spacecraft ID is "-21". Select it as target using
  780.  
  781.         that number or its unique name ("SOHO").
  782.  
  783.  
  784.  
  785.         SOHO can also be used as an observing site by picking a target
  786.  
  787.         (i.e., "Sun") and then a coordinate center of "@-21" (or "@SOHO").
  788.  
  789.  
  790.  
  791.  
  792.  
  793.  Nov 24, 2009:
  794.  
  795.     -- Unidentified object 9U01FF6 has been added to Horizons. It may be
  796.  
  797.         accessed under that designation or the unofficial SPK ID 9901885.
  798.  
  799.         The object is thought to be artificial and a piece of debris, based
  800.  
  801.         on trajectory response to solar radiation pressure.
  802.  
  803.  
  804.  
  805.  Nov 07, 2009:
  806.  
  807.     -- Version 3.35a
  808.  
  809.         Fixed a bug that caused no output when using calendrical output
  810.  
  811.         stepping to step by month into a non-existent range of date labels
  812.  
  813.         (i.e., the Gregorian calendar switch-over point in October 1582).
  814.  
  815.  
  816.  
  817.  Oct 28, 2009:
  818.  
  819.     -- Rosetta spacecraft trajectory update for Nov 13 Earth flyby.
  820.  
  821.  
  822.  
  823.  Oct 19, 2009:
  824.  
  825.     -- Kepler trajectory updated to reflect last several months of tracking
  826.  
  827.         data, with predicts to 2013.
  828.  
  829.  
  830.  
  831.  Oct 07, 2009:
  832.  
  833.     -- Final LCROSS pre-impact update for Horizons.
  834.  
  835.     -- Cassini reference trajectory updated.
  836.  
  837.  
  838.  
  839.  Sep 29, 2009:
  840.  
  841.     -- LCROSS spacecraft trajectory has been updated to model the impact
  842.  
  843.         targeting maneuver TCM-8 planned for tomorrow, Sep 30, 2009 @15:00 UTC.
  844.  
  845.         Further trajectory update(s) are expected in the days ahead.
  846.  
  847.  
  848.  
  849.  Sep 28, 2009:
  850.  
  851.     -- MESSENGER trajectory update from APL for tomorrow's Mercury flyby and
  852.  
  853.         gravity-assist: 2009-Sep-29 21:56 UTC at 228 km altitude.
  854.  
  855.  
  856.  
  857.  Sep 25, 2009:
  858.  
  859.     -- Jupiter planet-center (599) and satellites 539-549, 55050-55053,
  860.  
  861.         55055-55061, and 55063-55064 have been updated to new solutions
  862.  
  863.         JUP266 and JUP267 (JPL, R. Jacobson) and extended in time (1900-2099).
  864.  
  865.  
  866.  
  867.  
  868.  
  869.  Sep 09, 2009:
  870.  
  871.     -- Recent monthly and since-inception usage counts:
  872.  
  873.           Horizons usage summary 2009-Jul-15 to 2009-Aug-15
  874.  
  875.           Connections:                 Products:
  876.  
  877.             Telnet          13073         Telnet          32056
  878.  
  879.             WWW             49664         WWW             93226
  880.  
  881.             E-mail           4400         E-mail           8683
  882.  
  883.                                           SPK obj/fil       119/118
  884.  
  885.             ---------------------         ---------------------
  886.  
  887.             Total(month)    67137         Total(month)   134084
  888.  
  889.            >TOTAL(Oct96)  8453875        >TOTAL(Oct96) 13264926
  890.  
  891.  
  892.  
  893.  Sep 04, 2009:
  894.  
  895.     -- LCROSS, WISE, Chandra, MEX, VEX, Herschel & Planck spacecraft - updated.
  896.  
  897.  
  898.  
  899.  Sep 02, 2009:
  900.  
  901.     -- MEX and VEX spacecraft trajectories have been updated ... and should be
  902.  
  903.         more routinely now, thanks to Jose Luis Vazquez-Garcia at ESA.
  904.  
  905.  
  906.  
  907.  Aug 17, 2009:
  908.  
  909.     -- Saturnian satellites 601-609, 612-614, 632-634, 649, 653, and
  910.  
  911.         barycentric shift vector 699 for planet center have new solutions
  912.  
  913.         SAT317XL, SAT321, and SAT323 (R. Jacobson, JPL) which also cover
  914.  
  915.         an extended interval from 1600-2600 A.D.
  916.  
  917.  
  918.  
  919.  Aug 14, 2009:
  920.  
  921.     -- The Ulysses spacecraft trajectory has been updated to reflect all
  922.  
  923.         tracking data through the final pass 2009-Jun-29.  A predicted segment
  924.  
  925.         extends thereafter to 2050. Thanks to Mark Ryne (JPL Navigation)
  926.  
  927.         for putting this together. Way to go Ulysses!  What a trip.
  928.  
  929.  
  930.  
  931.  Aug 10, 2009:
  932.  
  933.     -- Trajectories for Chandra, HST, GALEX, and the ISS were updated today.
  934.  
  935.  
  936.  
  937.  Aug 04, 2009:
  938.  
  939.     -- Cassini (-82) reference trajectory has been updated through 2017.