SeedRandom[36]
data = RandomReal[{-0.5, 1}, 10]

BarLegend[{"SolarColors", MinMax[data]}]

MinMax[data]
(* {-0.289979, 0.789597} *)

DensityPlot[y, {x, 0, 1}, {y, Min[data], Max[data]},
 PlotRangePadding -> None, ColorFunction -> "SolarColors",
 AspectRatio -> 15,
 ImageSize -> {Automatic, 250},
 FrameTicks -> {{None,
    Sort@Join[
      LinTicks[Min[data], Max[data], TickDirection -> Out,
       MajorTickLength -> 0.2,
       MinorTickLength ->
        0.1], ({#, NumberForm[#, 2], {0, 0.2}, {}} &) /@
       MinMax[data]]}, {None, None}}
 ]