107 Aquarii (abbreviated 107 Aqr) is a double star in the equatorial constellation of Aquarius. 107 Aquarii is the Flamsteed designation, although it also bears the Bayer designation i2 Aquarii. The pair have an angular separation of 6.787 arcseconds.[3] They have a combined apparent visual magnitude of 5.305,[2] with individual magnitudes of 5.72 and 6.72.[3] The annual parallax shift measured for the two components is 16.1 mas and 20.0 mas respectively, although with significant statistical margins of error and flags for potential unreliability of both values. This indicates the system may be at a distance of 160–200 light-years (49–61 parsecs) from Earth.
| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 46m 00.92254s[1] |
| Declination | –18° 40′ 42.0313″[1] |
| Apparent magnitude (V) | 5.305[2] (5.72/6.72)[3] |
| Characteristics | |
| Spectral type | F2 III F2 V[3] |
| U−B color index | 0.141[2] |
| B−V color index | 0.287[2] |
| Astrometry | |
| Radial velocity (Rv) | –0.70[4] km/s |
| Absolute magnitude (MV) | 0.97[4] |
| A | |
| Proper motion (μ) | RA: 132.908[5] mas/yr Dec.: 16.011[5] mas/yr |
| Parallax (π) | 16.1378 ± 0.2169 mas[5] |
| Distance | 202 ± 3 ly (62.0 ± 0.8 pc) |
| B | |
| Proper motion (μ) | RA: 139.256[6] mas/yr Dec.: 10.050[6] mas/yr |
| Parallax (π) | 20.0193 ± 0.3991 mas[6] |
| Distance | 163 ± 3 ly (50.0 ± 1.0 pc) |
| Details | |
| A | |
| Radius | 2.43[5] R☉ |
| Luminosity | 16.647[5] L☉ |
| Temperature | 7,482[5] K |
| Rotational velocity (v sin i) | 70[7] km/s |
| B | |
| Radius | 1.47[6] R☉ |
| Luminosity | 4.421[6] L☉ |
| Temperature | 6,889[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
edit- ^ a b van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Rakos, K. D.; et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series, 47: 221–235, Bibcode:1982A&AS...47..221R
- ^ a b c d Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- ^ "* i02 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2007-07-14.