HD 102776
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 11h 49m 41.06733s[2] |
| Declination | −63° 47′ 18.5007″[2] |
| Apparent magnitude (V) | 4.30[1] (+4.30 - 4.39)[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | B3V[4] |
| U−B color index | −0.59 |
| B−V color index | −0.15 |
| Variable type | γ Cas[3] |
| Astrometry | |
| Radial velocity (Rv) | +29.0±4.1[1] km/s |
| Proper motion (μ) | RA: −22.022[2] mas/yr Dec.: +2.755[2] mas/yr |
| Parallax (π) | 4.5957±0.3290 mas[2] |
| Distance | 710 ± 50 ly (220 ± 20 pc) |
| Absolute magnitude (MV) | −1.98[1] |
| Details | |
| Mass | 5.955 M☉[5] 7.2±0.1[6] M☉ |
| Radius | 5.00±0.10[7] R☉ |
| Luminosity | 1,342[1] L☉ |
| Surface gravity (log g) | 3.20±0.03[7] cgs |
| Temperature | 20,000±200[7] K |
| Rotational velocity (v sin i) | 200±4[7] km/s |
| Age | 31.6±0.6[6] Myr |
| Other designations | |
| j Cen, NSV 5357, CPD−63°1988, FK5 2944, GC 16201, HD 102776, HIP 57669, HR 4537, SAO 251602[8] | |
| Database references | |
| SIMBAD | data |
HD 102776, also known by its Bayer designation j Centauri, is a suspected astrometric binary[9] star system in the southern constellation of Centaurus. It has a blue-white hue and is faintly visible to the naked eye with a typical apparent visual magnitude of 4.30.[1] The distance to this star is approximately 710 light years based on parallax,[2] and it is drifting further away with a radial velocity of ~29 km/s.[1] It is a member of the Lower Centaurus Crux subgroup of the Sco OB2 association.[10] HD 102776 has a relatively large peculiar velocity of 31.1 km/s and is a candidate runaway star that was ejected from its association, most likely by a supernova explosion.[11]
The stellar classification of the visible component is B3V,[4] matching a B-type main-sequence star. It is around 32[6] million years old and is spinning rapidly with estimates of its projected rotational velocity ranging from 200[7] up to 270 km/s, giving it an equatorial bulge that is up to 11% larger than the polar radius.[13] This is a Be star showing emission features in its Balmer lines due to a circumstellar disk of decreated gas.[14] It is classified as a suspected Gamma Cassiopeiae type variable star with a visual magnitude varying from +4.30 down to +4.39.[3]
References
[edit | edit source]- ^ a b c d e f g Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). XHIP record for this object at VizieR.
- ^ a b c d e f g Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
