Omicron Piscium

Omicron Piscium
Location of ο Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 01h 45m 23.63185s[1]
Declination +09° 09′ 27.8530″[1]
Apparent magnitude (V) 4.27[2]
Characteristics
Evolutionary stage Horizontal branch[3]
Spectral type K0 III[2]
U−B color index +0.736[4]
B−V color index +0.959[4]
Astrometry
Proper motion (μ) RA: +72.98[1] mas/yr
Dec.: +39.30[1] mas/yr
Parallax (π)11.67 ± 0.67 mas[1]
Distance280 ± 20 ly
(86 ± 5 pc)
Absolute magnitude (MV)−0.22[2]
Details[5]
Mass3.03 M☉
Radius14.38±0.21[6] R☉
Luminosity132 L☉
Surface gravity (log g)2.57 cgs
Temperature5,004 K
Metallicity [Fe/H]0.10 dex
Rotational velocity (v sin i)2.88 km/s
Age390 Myr
Other designations
Torcular, Torcularis Septentrionalis, ο Psc, 110 Piscium, BD+08° 273, FK5 60, GC 2139, HD 10761, HIP 8198, HR 510, SAO 110110, PPM 144950[7]
Database references
SIMBADdata

Omicron Piscium (ο Piscium, abbreviated Omi Psc, ο Psc) is a binary star in the constellation of Pisces. It is visible to the naked eye, having an apparent visual magnitude of 4.27.[2] Based upon an annual parallax shift of 11.67 mas as seen from the Earth,[1] the system is located roughly 280 light-years from the Sun. It is positioned near the ecliptic, so is subject to occultation by the Moon.[8] It is a member of the thin disk population of the Milky Way.[5]

The two components are designated Omicron Piscium A (formally named Torcular /ˈtɔːrkjʊlər/)[9] and B.

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Setaiwan2004 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Jennens1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Jofre2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Baines2023 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Richichi2016a was invoked but never defined (see the help page).
  9. ^ "Naming Stars". IAU.org. Retrieved 16 December 2017.