Pi Geminorum

π Geminorum
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Gemini
Right ascension 07h 47m 30.32300s[1]
Declination +33° 24′ 56.5034″[1]
Apparent magnitude (V) 5.14[2]
Characteristics
Spectral type M1 IIIa[3]
U−B color index +1.90[2]
B−V color index +1.59[2]
Astrometry
Radial velocity (Rv)−13.36±0.34[4] km/s
Proper motion (μ) RA: -19.59[1] mas/yr
Dec.: -29.33[1] mas/yr
Parallax (π)4.93 ± 0.32 mas[1]
Distance660 ± 40 ly
(200 ± 10 pc)
Absolute magnitude (MV)−1.04[5]
Details
Radius56[6] R☉
Luminosity1,007[7] L☉
Temperature3,900[7] K
Other designations
π Gem, 80 Geminorum, BD+33° 1585, FK5 296, HD 62898, HIP 38016, HR 3013, SAO 60340.[8]
Database references
SIMBADdata

π Geminorum (Latinised as Pi Geminorum, abbreviated to π Gem or pi Gem) is a star located in the constellation Gemini, to the north of Castor. With an apparent visual magnitude of 5.14,[2] it is faintly visible to the naked eye on a dark night. Based upon an annual parallax|shift of 4.93 mas,[1] Pi Geminorum is located roughly 660 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an interstellar absorption factor of 0.033 due to interstellar dust.[5]

This is an evolved red giant star with a stellar classification of M1 IIIa.[3] The measured angular diameter of this star is 2.58±0.20 mas.[9] At the estimated distance of this star, this yields a physical size of about 56 times the radius of the Sun.[6] It is radiating roughly a thousand times the luminosity of the Sun from its outer atmosphere at an effective temperature of 3,900 K.[7]

Unexpectedly for a red giant, Pi Geminorum was found to be an X-ray source during the ROSAT all-sky survey. The most likely source for this emission is an 11.4 magnitude companion star located at an angular separation of 21 arcseconds along a position angle of 214°.[10] This star is suspected to be an astrometric companion of the primary component.[3]

  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 Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Famaey2009 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Ryon2009 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Lang2006 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Hunsch1998 was invoked but never defined (see the help page).