HD 54475
B-type main-sequence star in the constellation Puppis
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HD 54475, also known as D Puppis, is a B-type star and a pulsating variable in the constellation of Puppis. It has an apparent magnitude of 5.783, which is enough to be visible to the unaided eye.[a] The distance to D Puppis, based on a parallax of 4.53±0.06 mas from the Gaia satellite, is 720 light-years.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Puppis[2] |
| Right ascension | 07h 07m 07.078s[3] |
| Declination | −40° 53′ 35.77″[3] |
| Apparent magnitude (V) | 5.783±0.009[4] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B3V[5] |
| Variable type | SPB[6] |
| Astrometry | |
| Radial velocity (Rv) | 6±3.2[3] km/s |
| Proper motion (μ) | RA: −10.554 mas/yr[3] Dec.: +11.163 mas/yr[3] |
| Parallax (π) | 4.5288±0.0584 mas[3] |
| Distance | 720 ± 9 ly (221 ± 3 pc) |
| Absolute magnitude (MV) | −1.08[2] |
| Details | |
| Mass | 5.4[7] M☉ |
| Radius | 3.4[3] R☉ |
| Luminosity | 2,609[7] L☉ |
| Surface gravity (log g) | 3.62[7] cgs |
| Temperature | 24,260[7] K |
| Rotational velocity (v sin i) | 200[8] km/s |
| Age | 15.8±0.3[9] Myr |
| Other designations | |
| CD−40 2930, HD 54475, HIP 34339, HR 2691, SAO 218465, TIC 157533670, TYC 7633-2698-1, WISE J070707.07-405335.6[10] | |
| Database references | |
| SIMBAD | data |
Characteristics
This is a B-type main-sequence star with a spectral type of B3V.[5] It has times the mass of the Sun and 3.4 times the Sun's radius.[7] It radiates 2,609 times the solar luminosity from its outer atmosphere at a temperature of 24,360 K. Its age is estimated to be of about 15 million years.[9]
HD 54475 has been classified as a slowly pulsating B-type star,[6] but it has not been formally named as a variable star. The General Catalogue of Variable Stars lists it as a suspected variable with an amplitude of less than a tenth of a magnitude.[11]
Notes
- According to the Bortle scale