11 Orionis
Star in the constellation Orion
From Wikipedia, the free encyclopedia
11 Orionis is a solitary[10] Ap star in the equatorial constellation of Orion, near the border with Taurus. It is visible to the naked eye with an apparent visual magnitude of 4.65,[7] and it is located approximately 365 light years away from the Sun based on parallax.[1] The star is moving further from the Sun with a heliocentric radial velocity of +16.8 km/s.[6]
Right ascension05h 04m 34.14916s[1]
Declination+15° 24′ 14.7771″[1]
Apparentmagnitude(V)4.65 – 4.69[2]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 04m 34.14916s[1] |
| Declination | +15° 24′ 14.7771″[1] |
| Apparent magnitude (V) | 4.65 – 4.69[2] |
| Characteristics | |
| Spectral type | B9 IV[3] or A1 Vp SiCr[4] |
| U−B color index | −0.10[5] |
| B−V color index | −0.06[5] |
| Variable type | α² CVn[2] |
| Astrometry | |
| Radial velocity (Rv) | +16.80[6] km/s |
| Proper motion (μ) | RA: +17.80[1] mas/yr Dec.: −31.15[1] mas/yr |
| Parallax (π) | 8.93±0.24 mas[1] |
| Distance | 365 ± 10 ly (112 ± 3 pc) |
| Absolute magnitude (MV) | −0.59[7] |
| Details | |
| Mass | 2.7[8] M☉ |
| Radius | 4.3[8] R☉ |
| Luminosity | 220[7] L☉ |
| Surface gravity (log g) | 3.6[8] cgs |
| Temperature | 9,520[3] K |
| Rotational velocity (v sin i) | 63.3±3.6[8] km/s |
| Other designations | |
| 11 Ori, V1032 Ori, BD+15°732, FK5 1140, GC 6191, HD 32549, HIP 23607, HR 1638, SAO 94290[9] | |
| Database references | |
| SIMBAD | data |
This object is a chemically peculiar star, known as an Ap star, with enhanced silicon and chromium lines in its spectrum.[12] It is an α² CVn variable, ranging from 4.65 to 4.69 magnitude with a period of 4.64 days.[2] The magnetic field measured from metal lines has a strength of +160±390 G.[13]