Delta Piscium
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 00h 48m 40.9443s |
| Declination | +07° 35′ 06.295″ |
| Apparent magnitude (V) | +4.416 |
| Characteristics | |
| Evolutionary stage | red giant branch |
| Spectral type | K4 IIIb |
| U−B color index | +1.831 |
| B−V color index | +1.500 |
| Astrometry | |
| Radial velocity (Rv) | +32.45±0.18 km/s |
| Proper motion (μ) | RA: +81.994 mas/yr Dec.: −50.232 mas/yr |
| Parallax (π) | 10.8577±0.1787 mas |
| Distance | 300 ± 5 ly (92 ± 2 pc) |
| Absolute magnitude (MV) | −0.46 |
| Details | |
| Mass | 1.65 M☉ |
| Radius | 38.01+0.71 −0.73 R☉ |
| Luminosity | 291.7±13.3 L☉ |
| Surface gravity (log g) | 1.88 cgs |
| Temperature | 3868±35 K |
| Metallicity [Fe/H] | −0.19 dex |
| Rotational velocity (v sin i) | 5.5 km/s |
| Age | 2.98 Gyr |
| Other designations | |
| Waiping, δ Psc, 63 Piscium, BD+06°107, FK5 28, HD 4656, HIP 3786, HR 224, SAO 109474, WDS J00487+0735A | |
| Database references | |
| SIMBAD | data |
Delta Piscium, also named Waiping, is a solitary, orange-hued star in the zodiac constellation of Pisces. It has an apparent visual magnitude of +4.4, so it is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 10.86 mas, it is around 300 light-years (92 parsecs) from the Sun. The visual magnitude of the star is diminished by an interstellar absorption factor of 0.08 due to interstellar dust.
Naming
Delta Piscium (Latinized from δ Piscium) is the star's Bayer designation.
In Chinese astronomy, 外屏 (Wài Píng), meaning Outer Fence, refers to an asterism of stars, δ Piscium, ε Piscium, ζ Piscium, μ Piscium, ν Piscium, ξ Piscium and α Piscium. Consequently, the Chinese name for δ Piscium itself is 外屏一 (Wài Píng yī, English: the First Star of Outer Fence.) The IAU Working Group on Star Names approved the name Waiping for this star on 17 September 2026.
Properties
This is an evolved K-type giant star with a stellar classification of K4 IIIb. It has around 1.65 times the mass of the Sun and, at the age of three billion years, has expanded to 38 times the Sun's radius. The star is radiating 292 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,868 K.
Because Delta Piscium is positioned near the ecliptic, so it is subject to lunar occultations. It has a magnitude 13.99 visual companion at an angular separation of 135.0 arc seconds on a position angle of 12°, as of 2011.
References
- 1 2 3 4 5 6 7 8 9 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 3 4 Cousins, A. W. J. (1984), "Standardisation of broad band photometry of equatorial standards", South Africa Astronomical Observatory Circular, 8: 59–67, Bibcode:1984SAAOC...8...59C.
- 1 2 3 4 5 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
- 1 2 Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
- ↑ 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.
- 1 2 3 4 5 Baines, Ellyn K.; Thomas Armstrong, J.; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David; Nisley, Ishara; Sanborn, Jason; Schmitt, Henrique R. (November 2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 162 (5): 198. arXiv:2211.09030. Bibcode:2021AJ....162..198B. doi:10.3847/1538-3881/ac2431. ISSN 0004-6256. S2CID 238998021.
- ↑ "del Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-31.
{{cite web}}: CS1 maint: postscript (link) - 1 2 "IAU Catalog of Star Names". Retrieved 20 September 2026.
- ↑ 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.
- ↑ Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
- ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日 Archived 2016-03-03 at the Wayback Machine
- ↑ Meyer, C.; et al. (1995), "Observations of lunar occultations at Observatoire de la Cote d'Azur", Astronomy and Astrophysics Supplement, 110: 107, Bibcode:1995A&AS..110..107M.
- ↑ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
External links
- Kaler, James B. (January 6, 2012), "DELTA PSC (Delta Piscium)", STARS, University of Illinois, retrieved 2017-08-02.
