2 Equulei
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Equuleus |
| A | |
| Right ascension | 21h 02m 12.50262s |
| Declination | +07° 10′ 47.1545″ |
| Apparent magnitude (V) | 7.41 |
| B | |
| Right ascension | 21h 02m 12.39375s |
| Declination | +07° 10′ 44.7957″ |
| Apparent magnitude (V) | 7.64 |
| Characteristics | |
| A | |
| Evolutionary stage | subgiant |
| Spectral type | F6V |
| B | |
| Evolutionary stage | subgiant |
| Spectral type | F3V |
| Astrometry | |
| Radial velocity (Rv) | −4.8±1.6 km/s |
| Absolute magnitude (MV) | 2.16±0.18 |
| A | |
| Proper motion (μ) | RA: −9.184 mas/yr Dec.: −12.915 mas/yr |
| Parallax (π) | 8.8125±0.2481 mas |
| Distance | 370 ± 10 ly (113 ± 3 pc) |
| B | |
| Proper motion (μ) | RA: −4.238 mas/yr Dec.: −17.934 mas/yr |
| Parallax (π) | 8.5577 ± 0.0298 mas |
| Distance | 381 ± 1 ly (116.9 ± 0.4 pc) |
| Details | |
| 2 Equ A | |
| Mass | 1.73 M☉ |
| Radius | 2.6 R☉ |
| Luminosity | 12.9 L☉ |
| Surface gravity (log g) | 3.84 cgs |
| Temperature | 6,127 K |
| Metallicity [Fe/H] | 0.17 dex |
| Age | 1.9 Gyr |
| 2 Equ B | |
| Mass | 1.61 M☉ |
| Radius | 2.8 R☉ |
| Luminosity | 10.9 L☉ |
| Surface gravity (log g) | 3.72 cgs |
| Temperature | 6,420 K |
| Age | 2.2 Gyr |
| Other designations | |
| λ Equ, 2 Equulei, BD+06°4731, HD 200256, HIP 103813, LTT 16227, SAO 126482 | |
| Database references | |
| SIMBAD | data |
2 Equulei is a double star system in the constellation of Equuleus.
The primary component of the 2 Equulei pair is an F-type star. As of 2015, the secondary had an angular separation of 2.90 arc seconds along a position angle of 213° from the primary. They form a common proper motion pair, two stars at approximately the same distance and moving in the same direction. Gaia DR3 gives them parallaxes of 8.8125±0.2471 mas and 8.5577±0.0298 mas respectively, although they are flagged as potentially unreliable. These parallaxes correspond to a distance of around 380 ly, in contrast to the Hipparcos distance of 260±20 ly for the two stars as a pair.
2 Equulei has been referred to in some sources as λ (Lambda) Equulei, although it was not given that designation by Bayer.