Pi Serpentis

Pi Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension 16h 02m 17.69166s[1]
Declination +22° 48′ 16.0302″[1]
Apparent magnitude (V) 4.82[2]
Characteristics
Spectral type A3 V[3]
U−B color index +0.10[2]
B−V color index +0.06[2]
Astrometry
Radial velocity (Rv)−28.2±4.2[4] km/s
Proper motion (μ) RA: +4.03[1] mas/yr
Dec.: +23.60[1] mas/yr
Parallax (π)18.22 ± 0.26 mas[1]
Distance179 ± 3 ly
(54.9 ± 0.8 pc)
Absolute magnitude (MV)1.12[5]
Details
Mass2.50[6] M☉
Radius2.27[7] R☉
Luminosity27[8] L☉
Surface gravity (log g)4.040[9] cgs
Temperature7,566±12[10] K
Metallicity [Fe/H]0.380[9] dex
Rotational velocity (v sin i)128[11] km/s
Age320[6] Myr
Other designations
π Ser, 44 Serpentis, BD+23° 2886, FK5 3268, HD 143894, HIP 78554, HR 5972, SAO 84155[12]
Database references
SIMBADdata

Pi Serpentis, Latinized from π Serpentis, is a solitary[13] white-hued star in the constellation Serpens, located in its head, Serpens Caput. Based upon an annual parallax shift of 18.22 mas as seen from Earth, it is located around 179 light years from the Sun. It is visible to the naked eye with an apparent visual magnitude of 4.82.[2]

This is an A-type main sequence star with a stellar classification of A3 V.[3] It is about 320[6] million years old with a high rate of spin, measured at a 128[11] km/s projected rotational velocity. The star has an estimated 2.50[6] times the mass of the Sun and 2.27[7] times the Sun's radius. It is radiating 27[8] times the solar luminosity from its photosphere at an effective temperature of 7,566 K.[10]

In 1992, an infrared excess was detected from this system at a wavelength of 60μm.[14] The data suggests a dusty debris disk with a temperature of 45 K is orbiting 211 AU from the host star.[7]

  1. ^ a b c d e 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 Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference DeRosa2014 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Rhee2007 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Soubiran2010 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference aa453_A95 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Rodriguez2012 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Cheng1992 was invoked but never defined (see the help page).