// Workers AI · dad joke modeWhat did 112 Piscium say to its friend? You're a star fish.
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| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Pisces[1] |
| Right ascension | 02h 00m 09.15955s[2] |
| Declination | +03° 05′ 49.2504″[2] |
| Apparent magnitude (V) | 5.89[1] |
| Characteristics | |
| Evolutionary stage | subgiant[2] |
| Spectral type | G2IV[3] or G0V[1] |
| B−V color index | 0.610[1] |
| Astrometry | |
| Radial velocity (Rv) | −18.50±0.14[2] km/s |
| Proper motion (μ) | RA: +230.826 mas/yr[2] Dec.: −256.471 mas/yr[2] |
| Parallax (π) | 31.4492±0.0566 mas[2] |
| Distance | 103.7 ± 0.2 ly (31.80 ± 0.06 pc) |
| Absolute magnitude (MV) | 3.27[1] |
| Details | |
| Mass | 1.100±0.134[4] M☉ |
| Radius | 1.80±0.06[5] R☉ |
| Luminosity | 3.74[2] L☉ |
| Surface gravity (log g) | 4.03±0.10[5] cgs |
| Temperature | 5967±70[5] K |
| Metallicity [Fe/H] | +0.21±0.07[5] dex |
| Rotational velocity (v sin i) | 4.8±0.6[5] km/s |
| Age | 5.9[2] Gyr |
| Other designations | |
| Zibbatu, 112 Psc, BD+02 311, GC 2416, GJ 83.2, HD 12235, HIP 9353, HR 582, SAO 110266, PPM 145195, LTT 10682, PLX 413[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
112 Piscium, also named Zibbatu,[7] is a star 103.7 light-years (31.8 parsecs) away in the constellation Pisces. With an apparent magnitude of 5.9, it is faintly visible to the naked eye under good viewing conditions. It appears near the brighter star Alpha Piscium (Alrescha) in the sky; the two are about 35′ apart.[6]
Nomenclature
[edit]112 Piscium is the star's Flamsteed designation; other designations include HD 12235 in the Henry Draper Catalogue.[6] The Akkadian zibbātu "tails" is a Babylonian name for the constellation Pisces, which was originally visualized as the tails of a swallow (SIM.MAḪ). The IAU Working Group on Star Names adopted the name Zibbatu for 112 Piscium on 17 September 2026.[7]
Properties
[edit]The stellar classification of 112 Piscium is G2IV,[3] indicating that it is a G-type subgiant star that has evolved off the main sequence. Other sources classify it as G0V,[1] matching a main-sequence star. Gaia DR3 supports a subgiant classification.[2][8] This star has about 1.1 times the mass[4] and 1.8 times the radius of the Sun,[5] and is radiating 3.7 times the Sun's luminosity[2] from its photosphere at an effective temperature of 5967 K. Classified as a population I star, it is older than the Sun and has a somewhat higher metallicity (abundance of elements heavier than helium).[5] It is thought to be a member of the HR 1614 group of stars that share a common motion through space.[9]
Planetary system
[edit]Two planetary companions to this star (HD 12235) were detected in 2022 using both radial velocity and astrometry.[4] A companion was previously suspected.[5] The inner planet has a minimum mass of about 10 Earth masses, making it a sub-Neptune; it orbits close to its star with a period of just 4.4 days. The outer planet is a super-Jupiter about 10 times the mass of Jupiter; it has a wide orbit with a period of about 100 years.[4][10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | ≥10+1 −2 M🜨 |
0.054±0.002 | 4.36305+0.00025 −0.00042 |
0.38+0.11 −0.25 |
— | — |
| c | 9.9+3.2 −1.8 MJ |
22.2+3.9 −2.8 |
36,337+9,732 −6,059 |
0.17+0.11 −0.15 |
47.7+12.7 −11.8 |
— |
References
[edit]- 1 2 3 4 5 6 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. XHIP record for this object at VizieR.
- 1 2 3 4 5 6 7 8 9 10 11 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 Cowley, A. P.; Bidelman, W. P. (February 1979). "MK spectral types for some F and G stars". Publications of the Astronomical Society of the Pacific. 91: 83. Bibcode:1979PASP...91...83C. doi:10.1086/130446. ISSN 0004-6280.
- 1 2 3 4 Feng, Fabo; Butler, R. Paul; et al. (September 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (1): 21. arXiv:2208.12720. Bibcode:2022ApJS..262...21F. doi:10.3847/1538-4365/ac7e57. ISSN 0067-0049.
- 1 2 3 4 5 6 7 8 Fuhrmann, Klaus; Chini, Rolf (March 2021). "On ancient solar-type stars – II". Monthly Notices of the Royal Astronomical Society. 501 (4): 4903–4916. Bibcode:2021MNRAS.501.4903F. doi:10.1093/mnras/staa3942. ISSN 0035-8711.
- 1 2 3 "* 112 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 September 2026.
- 1 2 "IAU Catalog of Star Names". Retrieved 20 September 2026.
- ↑ "Astrophysical parameter tables [Gaia DR3 documentation]". ESA. Retrieved 17 September 2026.
- ↑ Eggen, O. J. (November 1992). "HR 1614 and the dissolution of a supercluster". The Astronomical Journal. 104: 1906. Bibcode:1992AJ....104.1906E. doi:10.1086/116366.
- 1 2 "HD 12235 Overview". NASA Exoplanet Archive.
