85 Pegasi
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Pegasus |
| Right ascension | 00h 02m 10s |
| Declination | +27° 04′ 56″ |
| Apparent magnitude (V) | 5.75 / 9.01 |
| Characteristics | |
| Spectral type | G5Vb / K7V |
| U-B color index | 0.05 / ? |
| B-V color index | 0.67 / ? |
| V-R color index | 0.37 / ? |
| R-I color index | 0.42 / ? |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | -36.2 km/s |
| Proper motion (μ) | RA: 778.62 mas/yr Dec.: -918.78 mas/yr |
| Parallax (π) | 80.63 ± 3.03 mas |
| Distance | 40.5 ly (12.4 pc) |
| Absolute magnitude (MV) | 5.28 / 8.54 |
| Visual binary orbit | |
| Companion | 85 Pegasi B |
| Period (P) | 26.28 yr |
| Semimajor axis (a) | 0.83" |
| Eccentricity (e) | 0.38 |
| Inclination (i) | 49° |
| Longitude of the node (Ω) | ?° |
| Periastron epoch (T) | ? |
| Argument of periastron (ω) | ?° |
| Details | |
| Mass | 0.88 / 0.55 M☉ |
| Radius | 0.91 / 0.67 R☉ |
| Surface gravity (log g) | 4.45 / 4.58 |
| Luminosity | 0.61 / 0.05 L☉ |
| Temperature | 5550 / 4200 K |
| Metallicity | 58–75% |
| Rotation | ? days |
| Age | 9.345±0.5 × 109 years |
| Other designations | |
85 Pegasi is a multiple star system 40.5 light years away in the constellation of Pegasus.
The primary component is a sixth magnitude 85 Pegasi A, which is a yellow dwarf like our Sun. The second component: 85 Pegasi B (ninth magnitude orange dwarf) takes 26.28 years to orbit at 10.3 AU around primary in an elliptical orbit. The orbital distance ranges from 6.4 AU at periastron to 14.2 AU at apastron. 85 Peg BA may have a close, faint red dwarf companion 85 Peg BB within 2 AU from BA. The mass would be 11% solar mass.
All components in the star system including Star A are smaller, cooler and less massive, luminous, and metallic than our Sun and 51 Pegasi.
[edit] References
- J. Fernandes, P. Morel, Y. Lebreton (2002). "A calibration of the 85 Peg binary system" 392: 529–533.
[edit] See also
[edit] External links
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