HD 1185
HD 1185 is a double star in the northern constellation of Andromeda. The primary, with an apparent magnitude of 6.15, is a white main-sequence star of spectral type A2VpSi, indicating it has stronger silicon absorption lines than usual, thus making it also an Ap star. The secondary companion, which is 9.08 arcseconds away, is not visible to the naked eye at an apparent magnitude of 9.76. It shares common proper motion and parallax with the primary star but orbital parameters are still unknown.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| A | |
| Right ascension | 00h 16m 21.52890s |
| Declination | +43° 35′ 42.1834″ |
| Apparent magnitude (V) | 6.150 |
| B | |
| Right ascension | 00h 16m 22.33562s |
| Declination | +43° 35′ 44.5452″ |
| Apparent magnitude (V) | 9.76 |
| Characteristics | |
| A | |
| Evolutionary stage | main sequence |
| Spectral type | A2VpSi |
| U−B color index | 0.03 |
| B−V color index | 0.05 |
| Astrometry | |
| A | |
| Radial velocity (Rv) | 3.00±2.60 km/s |
| Proper motion (μ) | RA: +35.421 mas/yr Dec.: −23.037 mas/yr |
| Parallax (π) | 10.2349 ± 0.0329 mas |
| Distance | 319 ± 1 ly (97.7 ± 0.3 pc) |
| B | |
| Radial velocity (Rv) | 4.48±0.22 km/s |
| Proper motion (μ) | RA: +34.310 mas/yr Dec.: −21.927 mas/yr |
| Parallax (π) | 10.1971 ± 0.0157 mas |
| Distance | 319.9 ± 0.5 ly (98.1 ± 0.2 pc) |
| Details | |
| A | |
| Mass | 2.4 M☉ |
| Radius | 2.1 R☉ |
| Luminosity | 38 L☉ |
| Surface gravity (log g) | 4.02 cgs |
| Temperature | 9,103 K |
| Metallicity [Fe/H] | −0.11 dex |
| Rotational velocity (v sin i) | 128 km/s |
| Age | 311 Myr |
| B | |
| Mass | 1.0 M☉ |
| Radius | 0.90 R☉ |
| Luminosity | 0.76 L☉ |
| Surface gravity (log g) | 4.50 cgs |
| Temperature | 5,712 K |
| Metallicity [Fe/H] | −0.26 dex |
| Age | 224 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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