| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Puppis |
| Right ascension | 07h08m 51.06814s[1] |
| Declination | −39° 39′ 20.3590″[1] |
| Apparent magnitude (V) | 4.83[2] |
| Characteristics | |
| Spectral type | B2IV-V[3] |
| U−B color index | −0.69[2] |
| B−V color index | −0.18[2] |
| Variable type | suspected β Cep[4] |
| Astrometry | |
| Radial velocity (Rv) | +19.50[5] km/s |
| Proper motion (μ) | RA: −10.577[1] mas/yr Dec.: +7.785[1] mas/yr |
| Parallax (π) | 3.7743 ± 0.0894 mas[1] |
| Distance | 860 ± 20 ly (265 ± 6 pc) |
| Absolute magnitude (MV) | −2.05[6] |
| Details | |
| Mass | 6.3[1] M☉ |
| Radius | 7.0[1] R☉ |
| Luminosity | 2,389[1] L☉ |
| Surface gravity (log g) | 3.56[1] cgs |
| Temperature | 15,974[1] K |
| Metallicity [Fe/H] | +0.20[1] dex |
| Rotational velocity (v sin i) | 42.8[7] km/s |
| Age | 21.6[8] Myr |
| Other designations | |
A Puppis, 67 G. Puppis[9], NSV 3431, CD−39°3105, FK5 2551, GC 9463, HD 54893, HIP 34495, HR 2702, SAO 197632 | |
| Database references | |
| SIMBAD | data |
HD 54893, often called A Puppis is a suspected variable star in the constellation Puppis. Its apparent magnitude is 4.83 and is approximately 860 light years away based on parallax.
With a mass over six times that of the Sun, HD 54893 is a hot luminous star with an effective temperature of about 16,000 K and a bolometric luminosity of 2,400 L☉. The spectral class of B2IV/V suggest it is on the border between the main sequence and the subgiant branch. Evolutionary models show it is towards the end of the main sequence at an age of about 22 million years.
In a 1971 paper, HD 54893 is mentioned as being a confirmed β Cephei variable, but with no explanation of when it was discovered.[11] A 1971 thesis dedicated to β Cephei variables only mentions HD 54893 as a non-variable early B star.[12] In a 1977 search for β Cephei stars, it is listed as possibly being variable.[13] It is catalogued as a suspected variable star, but not confirmed.[4]
