HD 85725
Star in the constellation Antlia
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HD 85725, also known as HR 3916, is a yellow hued star located in the southern constellation Antlia. It has an apparent magnitude of 6.29,[1] placing it near the limit for naked eye visibility. The object is relatively close at a distance of 176 light-years,[2] but is receding with a heliocentric radial velocity of 61.6 km/s.[5]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Antlia[1] |
| Right ascension | 09h 52m 58.02763s[2] |
| Declination | −27° 19′ 55.8219″[2] |
| Apparent magnitude (V) | 6.28[1] |
| Characteristics | |
| Evolutionary stage | subgiant[2] |
| Spectral type | G1 V[3] |
| B−V color index | +0.62[4] |
| Astrometry | |
| Radial velocity (Rv) | 61.6±0.1[5] km/s |
| Proper motion (μ) | RA: −278.245 mas/yr[2] Dec.: +95.043 mas/yr[2] |
| Parallax (π) | 18.5634±0.0256 mas[2] |
| Distance | 175.7 ± 0.2 ly (53.87 ± 0.07 pc) |
| Absolute magnitude (MV) | +2.68[1] |
| Details | |
| Mass | 1.42[6] M☉ |
| Radius | 2.59±0.11[7] R☉ |
| Luminosity | 7.58[8] L☉ |
| Surface gravity (log g) | 3.86[9] cgs |
| Temperature | 5,940±110[7] K |
| Metallicity [Fe/H] | +0.15[10] dex |
| Rotational velocity (v sin i) | 5.9±0.3[11] km/s |
| Age | 2.75[6] Gyr |
| Other designations | |
| 33 G. Antliae, CD−26°7505, CPD−26°4079, HIP 48468, HR 3916, SAO 178130, WDS J09530-2720A[12] | |
| Database references | |
| SIMBAD | data |
HD 85725 has a stellar classification of G1 V,[3] which suggests that it is an ordinary G-type main-sequence star that is fusing hydrogen at its core. However, a low surface gravity of 7,244 cm/s2[9] and evolutionary models indicate that is an evolved subgiant.[2]
At present it has 143%[6] the mass of the Sun but is 2.59 times larger,[7] which is not characteristic of a yellow dwarf. It shines at 7.6[8] times the luminosity of the Sun from its photosphere at a surface temperature of 5,940 K,[7] which gives it a yellow glow. At an age of 2.75 billion years,[6] HD 85725 is spinning leisurely with a projected rotational velocity of 5.9 km/s.[11]
There is a 10th magnitude companion located 1.5″ away along a position angle of 25°. It appears to have a common proper motion with the star, suggesting physical relation.[13]