HD 49933
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 50m 49.83180s |
| Declination | −00° 32′ 27.1701″ |
| Apparent magnitude (V) | 5.781 |
| Characteristics | |
| HD 49933 A | |
| Spectral type | F2 V |
| U−B color index | −0.07 |
| B−V color index | +0.39 |
| HD 49933 B | |
| Spectral type | M0 |
| Astrometry | |
| Radial velocity (Rv) | −14.7 km/s |
| Proper motion (μ) | RA: +22.09 mas/yr Dec.: −186.51 mas/yr |
| Parallax (π) | 33.69±0.42 mas |
| Distance | 97 ± 1 ly (29.7 ± 0.4 pc) |
| Absolute magnitude (MV) | 3.42 |
| Position (relative to HD 49933 A) | |
| Component | HD 49933 B |
| Epoch of observation | 2016 |
| Angular distance | 6.5″ |
| Position angle | 23° |
| Projected separation | 190 AU |
| Details | |
| Mass | 1.079±0.073 M☉ |
| Radius | 1.385±0.031 R☉ |
| Luminosity | 3.47±0.18 L☉ |
| Surface gravity (log g) | 4.08 cgs |
| Temperature | 6,598 K |
| Metallicity [Fe/H] | −0.29 dex |
| Rotational velocity (v sin i) | 10 km/s |
| Age | 2.4 Gyr |
| Other designations | |
| BD−00°1462, HD 49933, HIP 32851, HR 2530, SAO 133760 | |
| Database references | |
| SIMBAD | data |
HD 49933 (HR 2530) is a binary star system in the equatorial constellation of Monoceros, the unicorn. The HD designation indicates the identifier of the star found in the Henry Draper catalogue. At an apparent magnitude of 5.8, this star can just be seen with the naked eye under suitably dark conditions. Based upon parallax measurements from the Hipparcos mission, the distance to HD 49933 is about 97 light-years (30 parsecs) with a 1% margin of error.