HR 1887
 Location of HD 36960 (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Orion |
| Right ascension | 5h 35m 02.68074s |
| Declination | −06° 00′ 07.3036″ |
| Apparent magnitude (V) | 4.72 |
| Characteristics | |
| Spectral type | B0.5 V |
| U−B color index | −0.98 |
| B−V color index | −0.22 |
| Astrometry | |
| Radial velocity (Rv) | +27.7 km/s |
| Proper motion (μ) |
RA: −0.66 mas/yr Dec.: +0.01 mas/yr |
| Parallax (π) | 2.02 ± 0.31mas |
| Distance | approx. 1,600 ly (approx. 500 pc) |
| Absolute magnitude (MV) | −3.18 |
| Details | |
| Mass | 15.66 M☉ |
| Radius | 5.6 R☉ |
| Luminosity | 19,952 L☉ |
| Surface gravity (log g) | 4.10 cgs |
| Temperature | 29,000 K |
| Metallicity [Fe/H] | −0.20 dex |
| Rotational velocity (v sin i) | 28 km/s |
| Age | 6 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 36960 (HR 1887) is a B-type main-sequence star in the constellation Orion. At an apparent magnitude of +4.78 it is easily visible to the naked eye in many areas, though in most urban areas it cannot be seen due to light pollution. Although it does not have a Bayer or Flamsteed designation, it is brighter than over 30 Flamsteed stars in Orion]], as well as being brighter than any of the stars in the nearby Orion Nebula such as θ1 Orionis C and θ2 Orionis.
HD 36960 forms a close pair with the slightly fainter HD 36959 36" away. Multiple star catalogues also list the 9th magnitude BD-06°1233 as part of the system. HD 36959 is itself a very close binary with a 9th magnitude companion. All these stars are likely members of open cluster NGC 1980 which includes ι Orionis 7' away.
At over 15 solar masses, it shines with around 20,000 times the Sun's luminosity due to its high surface temperature of 29,000 K and radius over five times that of the sun. It is calculated to be around six million years old, consistent with other stars thought to be members of NGC 1980.
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