Back 85 Pegasi AST 85 Pegasi Spanish ۸۵ پگاسوس Persian 85 Pegasi Italian ペガスス座85番星 Japanese 페가수스자리 85 Korean 85 Pegasi Dutch 85 Пегаса Russian 85 Pegasi Slovak 85 Pegasi Swedish
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 00h 02m 10.16s[1] |
| Declination | +27° 04′ 56.1″[1] |
| Apparent magnitude (V) | 5.75 / 8.89 |
| Characteristics | |
| Spectral type | G5Vb / K7V |
| Apparent magnitude (B) | 6.42 / 11.0 |
| Apparent magnitude (R) | 5.38 |
| Apparent magnitude (I) | 4.96 |
| Apparent magnitude (J) | 4.702 |
| Apparent magnitude (H) | 4.179 |
| Apparent magnitude (K) | 4.068 |
| 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: 780.22 ± 2.01[1] mas/yr Dec.: -917.75 ± 1.20[1] mas/yr |
| Parallax (π) | 82.5 ± 0.8 mas[2] |
| Distance | 39.5 ± 0.4 ly (12.1 ± 0.1 pc) |
| Absolute magnitude (MV) | 5.32[3] |
| Orbit | |
| Companion | 85 Pegasi B |
| Period (P) | 26.28 yr |
| Semi-major axis (a) | 0.83″ |
| Eccentricity (e) | 0.38 |
| Inclination (i) | 49° |
| Details | |
| Mass | 0.88 / 0.55 M☉ |
| Radius | 0.91 / 0.67 R☉ |
| Luminosity | 0.61 / 0.05 L☉ |
| Surface gravity (log g) | 4.45 / 4.58 cgs |
| Temperature | 5550 / 4200 K |
| Metallicity | 58–75% |
| Age | 3.8–4.4[4] Gyr |
| Other designations | |
| 85 Pegasi A: ADS 17175 A, GJ 914 A, BD +26°4734 A, BU 733 A. | |
| 85 Pegasi B: ADS 17175 B, GJ 914 B, BD +26°4734 B, BU 733 B. | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
85 Pegasi is a multiple star system 39.5 light years away[2] in the constellation of Pegasus. The primary component is sixth magnitude 85 Pegasi A, which is a yellow dwarf like the Sun. The secondary component, 85 Pegasi B, is a ninth magnitude orange dwarf that takes 26.28 years to orbit at 10.3 AU around the primary in an elliptical orbit. The orbital distance ranges from 6.4 AU at periastron to 14.2 AU at apastron. 85 Pegasi B may itself be a binary, with a close, faint red dwarf companion (designated 85 Pegasi Bb) separated by 2 AU from the primary (designated 85 Pegasi Ba). The mass would be 11% solar mass (M☉). All components in the star system including Star A are smaller, cooler and less massive, luminous, and metallic than the Sun and 51 Pegasi.
An infrared excess has been detected around the primary, most likely indicating the presence of a circumstellar disk at a radius of more than 97 AU. The temperature of this dust is below 25 K.[5]
- ^ a b c d Cite error: The named reference
van Leeuwen2007was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Soederhjelm1999was invoked but never defined (see the help page). - ^ Cite error: The named reference
Holmberg2009was invoked but never defined (see the help page). - ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal. 687 (2): 1264–1293. arXiv:0807.1686. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785. S2CID 27151456.
- ^ Cite error: The named reference
aa555_A11was invoked but never defined (see the help page).