HD 77887

{{Starbox begin

| name = HD 77887

}}

{{Starbox image

| image = 250px

| caption = A light curve for HD 77887, plotted from Hipparcos data

}}

{{Starbox observe

| epoch = J2000.0 (ICRS)

| constell = Volans

| ra = {{RA|09|01|08.5140}}

| dec = {{DEC|-68|41|02.1096}}

| appmag_v = {{val|5.87|0.01}}

}}

{{Starbox character

| type = AGB

| class = M1 III

| b-v = +1.63

| u-b = +1.96

| variable = Lb

}}

{{Starbox astrometry

| radial_v = {{val|12.6|0.4}}

| parallax = 4.2938

| p_error = 0.051

| parallax_footnote =

| prop_mo_ra = +16.413

| prop_mo_dec = −0.069

| absmag_v = −0.78

}}

{{Starbox detail

| source =

| mass = 1.12

| radius = 56.73

| luminosity = 598

| temperature = 3,820

| gravity = 0.9

| metal_fe =

| rotational_velocity =

| age_gyr =

}}

{{Starbox catalog

| names = {{odlist|Gould = 45 G. Volantis|HD = 77887|HR = 3610|HIP = 44283|CPD = −68°879|GC = 12510|SAO = 250421|NSV = 18118}}

}}

{{Starbox reference

| Simbad = HR+3610

}}

HD 77887 (HR 3610) is a solitary star located in the southern circumpolar constellation Volans. It has an apparent magnitude of 5.87, making it faintly visible to the naked eye if viewed under ideal conditions. The star is situated at a distance of about 760 light years but is receding with a heliocentric radial velocity of {{val|12.6|ul=km/s}}.

HD 77887 is an ageing M-type giant that is currently on the asymptotic giant branch. At present it has 1.12 times the mass of the Sun but has expanded to 56.73 times its girth. It shines at {{solar_luminosity|598|link=y}} from its enlarged photosphere at an effective temperature of {{val|3,820|ul=K|fmt=commas}}, which gives it a red glow. HD 77887 is suspected to be a slow irregular variable whose brightness fluctuates at a tenth of a magnitude. Koen and Eyer examined the Hipparcos data for the star, and found that it varied periodically, with an amplitude of 0.012 magnitudes, and a period of 4.4649 days.

References

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}}

Category:M-type giants

077887

044283

Category:Durchmusterung objects

Category:Suspected variables

3610

Category:Volans

Category:Asymptotic-giant-branch stars