HD 102776
Template:Short description Template:About-distinguish2
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 4.30[3] (+4.30 - 4.39)[4] |
| Characteristics | |
| Spectral type | B3V[5] |
| U−B Template:Engvar | −0.59 |
| B−V Template:Engvar | −0.15 |
| Variable type | γ Cas[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[3] km/s |
| Proper motion (μ) | RA: -20.76 ± 0.56[6] mas/yr Dec.: 4.30 ± 0.48[6] mas/yr |
| Parallax (π) | 5.4391±0.4369 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.98[3] |
| Details | |
| Mass | Script error: No such module "val".[7] Script error: No such module "val".[8] Template:Solar mass |
| Radius | Script error: No such module "val".[9] Template:Solar radius |
| Luminosity | 1,342[3] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[9] cgs |
| Temperature | Script error: No such module "val".[9] K |
| Rotational velocity (v sin i) | Script error: No such module "val".[9] km/s |
| Age | Script error: No such module "val".[8] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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HD 102776, also known by its Bayer designation j Centauri, is a suspected astrometric binary[11] 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.[3] The distance to this star is approximately 600 light years based on parallax, and it is drifting further away with a radial velocity of ~29 km/s.[3] It is a member of the Lower Centaurus Crux subgroup of the Sco OB2 association.[12] HD 102776 has a relatively large peculiar velocity of Script error: No such module "val". and is a candidate runaway star that was ejected from its association, most likely by a supernova explosion.[13]
The stellar classification of the visible component is B3V,[5] matching a B-type main-sequence star. It is around 32[8] million years old and is spinning rapidly with estimates of its projected rotational velocity ranging from 200[9] up to Script error: No such module "val"., giving it an equatorial bulge that is up to 11% larger than the polar radius.[14] This is a Be star showing emission features in its Balmer lines due to a circumstellar disk of decreated gas.[15] It is classified as a suspected Gamma Cassiopeiae type variable star with a visual magnitude varying from +4.30 down to +4.39.[4]
References
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- ↑ a b Script error: No such module "Citation/CS1". Vizier catalog entry
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- ↑ Template:Cite simbad
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- ↑ Script error: No such module "Citation/CS1".
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