Epsilon Pavonis
Star in the constellation Pavo
From Wikipedia, the free encyclopedia
Epsilon Pavonis is a single,[9] white-hued star in the constellation Pavo. Its name is a Bayer designation that is Latinized from ε Pavonis, and abbreviated Epsilon Pav or ε Pav. It can be viewed with the naked eye, having an apparent visual magnitude of 3.97.[2] The annual parallax shift of 31.04 mas[1] provides a distance estimate of 105 light years from the Sun.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pavo |
| Right ascension | 20h 00m 35.55558s[1] |
| Declination | −72° 54′ 37.8198″[1] |
| Apparent magnitude (V) | 3.97[2] |
| Characteristics | |
| Spectral type | A0 Va[2] |
| U−B color index | −0.05[3] |
| B−V color index | −0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | −6.7±0.7[4] km/s |
| Proper motion (μ) | RA: +81.78[1] mas/yr Dec.: −132.16[1] mas/yr |
| Parallax (π) | 31.04±0.17 mas[1] |
| Distance | 105.1 ± 0.6 ly (32.2 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.43[2] |
| Details | |
| Mass | 2.2[5] M☉ |
| Radius | 1.74[6] R☉ |
| Luminosity | 32[7] L☉ |
| Surface gravity (log g) | 4.32±0.02[6] cgs |
| Temperature | 10,440[8] K |
| Rotational velocity (v sin i) | 85[7] km/s |
| Age | 27[6] Myr |
| Other designations | |
| ε Pav, CPD−73°2086, FK5 748, GC 27631, HD 188228, HIP 98495, HR 7590, SAO 257757 | |
| Database references | |
| SIMBAD | data |
With a stellar classification of A0 Va,[2] Epsilon Pavonis is an ordinary A-type main-sequence star that is generating energy through hydrogen fusion at its core. It is just 27 million years old[6] with a projected rotational velocity of 85 km/s.[7] The star has 2.2 times the mass of the Sun[5] and 1.74 times the Sun's radius.[6] It is radiating 32 times the Sun's luminosity from its photosphere[7] at an effective temperature of 10,440 K.[8]
This star is a member of the proposed Argus Association, a young moving group of more than 60 stars associated with the IC 2391 cluster.[10] Epsilon Pavonis is moving closer to the Sun with a radial velocity of −6.7 km/s.[4]