94 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 19m 06.66907s[1] |
| Declination | –13° 27′ 30.8023″[1] |
| Apparent magnitude (V) | 5.19 / 7.52[2] |
| Characteristics | |
| 94 Aqr A | |
| Spectral type | G8.5 IV[3] + K V[4] |
| U−B color index | +0.42[2] |
| B−V color index | +0.79[2] |
| 94 Aqr B | |
| Spectral type | K2 V[3] |
| U−B color index | +0.60[2] |
| B−V color index | +0.88[2] |
| Astrometry | |
| Radial velocity (Rv) | +10.8[5] km/s |
| Proper motion (μ) | RA: +267.23[1] mas/yr Dec.: −46.21[1] mas/yr |
| Parallax (π) | 47.35 ± 2.47[1] mas |
| Distance | 69 ± 4 ly (21 ± 1 pc) |
| Orbit[5] | |
| Primary | 94 Aqr Aa |
| Companion | 94 Aqr Ab |
| Period (P) | 2323.6 ± 10.7 days |
| Eccentricity (e) | 0.082 ± 0.06 |
| Periastron epoch (T) | JD 2429308.4 ± 22 |
| Argument of periastron (ω) (secondary) | 225.7 ± 44.5° |
| Semi-amplitude (K1) (primary) | +5.9 ± 0.37 km/s |
| Details | |
| 94 Aqr Aa | |
| Mass | 1.29[4] M☉ |
| Surface gravity (log g) | 3.88[6] cgs |
| Temperature | 5,461[6] K |
| Metallicity [Fe/H] | +0.23[6] dex |
| Rotational velocity (v sin i) | 8[7] km/s |
| 94 Aqr Ab | |
| Mass | 0.85 or 0.91[4] M☉ |
| Temperature | 4,670 or 4,970[4] K |
| 94 Aqr B | |
| Surface gravity (log g) | 4.54[4] cgs |
| Temperature | 5,136[4] K |
| Metallicity [Fe/H] | +0.24[4] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
94 Aquarii (abbreviated 94 Aqr) is a triple star[5] system in the equatorial constellation of Aquarius. 94 Aquarii is the Flamsteed designation. The brightest member has an apparent visual magnitude of 5.19,[2] making it visible to the naked eye. An annual parallax shift of 47.35 milliarcseconds yields a distance estimate of around 69 light-years (21 parsecs) from Earth.[1]
The inner pair of this triple star system form a spectroscopic binary with an orbital period of 2323.6 days (6.36 years), a low orbital eccentricity of 0.08,[5] and a combined visual magnitude of 5.19.[1] The primary component of this pair has a stellar classification of G8.5 IV,[6] with the luminosity class of IV indicating this is a subgiant star. At an angular separation of 13.0 arcseconds from this pair is a magnitude 7.52[1] K-type main sequence star with a classification of K2 V.[3]
See also
References
- 1 2 3 4 5 6 7 8 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.
- 1 2 3 4 5 6 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
- 1 2 3 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.
- 1 2 3 4 5 6 7 Fuhrmann, Klaus (February 2008). "Nearby stars of the Galactic disc and halo - IV". Monthly Notices of the Royal Astronomical Society. 384 (1): 173–224. Bibcode:2008MNRAS.384..173F. doi:10.1111/j.1365-2966.2007.12671.x.
- 1 2 3 4 Sarma, M. B. K. (January 1962), "The Orbit of the Spectroscopic Binary 94 Aquarii", Astrophysical Journal, 135: 301, Bibcode:1962ApJ...135..301S, doi:10.1086/147268.
- 1 2 3 4 Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
- ↑ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B.
- ↑ "* 94 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-17.