HD 77887

HD 77887

A light curve for HD 77887, plotted from Hipparcos data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Volans
Right ascension 09h 01m 08.5140s[2]
Declination −68° 41′ 02.1096″[2]
Apparent magnitude (V) 5.87±0.01[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type M1 III[5]
U−B color index +1.96[6]
B−V color index +1.63[6]
Variable type Lb[7]
Astrometry
Radial velocity (Rv)12.6±0.4[8] km/s
Proper motion (μ) RA: +16.413[2] mas/yr
Dec.: −0.069[2] mas/yr
Parallax (π)4.2938 ± 0.051 mas[2]
Distance760 ± 9 ly
(233 ± 3 pc)
Absolute magnitude (MV)−0.78[9]
Details[10]
Mass1.12[11] M☉
Radius56.73 R☉
Luminosity598 L☉
Surface gravity (log g)0.9 cgs
Temperature3,820 K
Other designations
45 G. Volantis, NSV 18118, CPD−68°879, GC 12510, HD 77887, HIP 44283, HR 3610, SAO 250421
Database references
SIMBADdata

HD 77887 (HR 3610) is a solitary star located in the southern circumpolar constellation Volans. It has an apparent magnitude of 5.87,[3] 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[2] but is receding with a heliocentric radial velocity of 12.6 km/s.[8]

HD 77887 is an ageing M-type giant[5] that is currently on the asymptotic giant branch.[4] At present it has 1.12 times the mass of the Sun[11] but has expanded to 56.73 times its girth.[10] It shines at 598 L☉ from its enlarged photosphere at an effective temperature of 3,820 K,[10] which gives it a red glow. HD 77887 is suspected to be a slow irregular variable[7] whose brightness fluctuates at a tenth of a magnitude.[12] 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.[13]

  1. ^ Cite error: The named reference HIPCurve was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Jayasinghe2018 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Waston2006 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Koen was invoked but never defined (see the help page).