HD 32188
Star in the constellation Auriga
From Wikipedia, the free encyclopedia
HD 32188 is suspected variable star[5] in the northern constellation of Auriga, and is positioned roughly in between Eta and Zeta Aurigae. It has a white hue and is just barely visible to the naked eye with an apparent visual magnitude that fluctuates around 6.08.[3] The distance to this star is approximately 3,240 light years, based on parallax.[2] It has an absolute magnitude of −2.87.[4]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 05h 03m 18.63s[2] |
| Declination | +41° 26′ 29.9″[2] |
| Apparent magnitude (V) | 6.08[3] |
| Characteristics | |
| Spectral type | A2IIIshe[4] |
| U−B color index | +0.22[3] |
| B−V color index | +0.21[3] |
| Variable type | Suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | −0.7[6] km/s |
| Proper motion (μ) | RA: −0.227[2] mas/yr Dec.: −1.820[2] mas/yr |
| Parallax (π) | 1.0065±0.0294 mas[2] |
| Distance | 3,240 ± 90 ly (990 ± 30 pc) |
| Absolute magnitude (MV) | −2.87[4] |
| Details | |
| Mass | 3.1[7] M☉ |
| Radius | 40[2] R☉ |
| Luminosity | 5,370[8] L☉ |
| Surface gravity (log g) | [7] cgs |
| Temperature | 8,665[7] K |
| Rotation | 0.41 days[8] |
| Rotational velocity (v sin i) | 23[9] km/s |
| Other designations | |
| NSV 1810, BD+41°1044, HD 32188, HIP 23511, HR 1615, SAO 39979[10] | |
| Database references | |
| SIMBAD | data |
This object is an A-type giant star with a stellar classification of A2IIIshe.[4] The suffix notation indicates this is a shell star,[11] which means it has a peculiar spectrum indicating there is a circumstellar disk of gas around the star's equator. While the spectral luminosity class is III, analysis of its colour and brightness suggest it more closely resembles a supergiant star.[4] HD 32188 has expanded to 40 times the radius of the Sun[2] and it is spinning with a projected rotational velocity of 23 km/s.[9] It is radiating 5,370 times the luminosity of the Sun[8] from its enlarged photosphere at an effective temperature of 8,665 K.[7]