Gamma Crateris

γ Crateris
Location of γ Crateris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Crater
Right ascension 11h 24m 52.92362s[1]
Declination −17° 41′ 02.4300″[1]
Apparent magnitude (V) 4.06[2]
Characteristics
Spectral type A9 V[3]
U−B color index +0.09[2]
B−V color index +0.22[2]
Astrometry
Radial velocity (Rv)+1.0±4.1[4] km/s
Proper motion (μ) RA: −97.42[1] mas/yr
Dec.: +3.65[1] mas/yr
Parallax (π)38.0906 ± 0.3570 mas[5]
Distance85.6 ± 0.8 ly
(26.3 ± 0.2 pc)
Absolute magnitude (MV)+2.05[6]
Details
γ Crt A
Mass1.81[7] M☉
Radius1.3[8] R☉
Luminosity18.8[9] L☉
Surface gravity (log g)4.21±0.14[10] cgs
Temperature8,020±273[10] K
Metallicity [Fe/H]−0.01[11] dex
Rotational velocity (v sin i)144[12] km/s
Age757[10] Myr
γ Crt B
Mass0.75[7] M☉
Other designations
γ Crt, 15 Crateris, BD−16° 3244, FK5 431, HD 99211, HIP 55705, HR 4405, SAO 156661.,[13] NT 2, NGCA-V97
Database references
SIMBADdata

Gamma Crateris is a binary star[7] system, divisible with a small amateur telescope,[14] and located at the center of the southern constellation of Crater. It is visible to the naked eye with an apparent visual magnitude of 4.06.[2] With an annual parallax shift of 39.62 mas as seen from Earth, this star is located 82.3 light years from the Sun. Based upon the motion of this system through space, it is a potential member of the Castor Moving Group.[15]

The star was confirmed by Gabriel Cristian Neagu and Jan Ovidiu Tercu as a variable of DSCT type. The variability has an amplitude of 0.001 magnitudes and a main period of 0.03647 d  (52.52 min). The variability was discovered during the datamining activity with the goal of increasing the student's investigative competences.[16]

The primary, component A, is a white-hued A-type main sequence star of apparent visual magnitude 4.08 with a stellar classification of A9 V.[3] The star has an estimated 1.81[7] times the mass of the Sun and around 1.3[8] times the Sun's radius. It is about 757[10] million years old and is spinning with a projected rotational velocity of 144 km/s.[12] The primary is radiating 18.8[9] times the solar luminosity from its outer atmosphere at an effective temperature of 8,020 K.[10] Based upon the detection of an infrared excess, the star may host an orbiting debris disk.[9] However, this finding remains in doubt.[17]

The companion, component B, is a magnitude 9.6 star with an estimated mass 75% that of the Sun. As of 2010, the companion was located at an angular separation of 4.98 arc seconds along a position angle of 93.1° relative to the primary. This is equivalent to a projected separation of 125.6 AU.[7] This star may be the source of the X-ray emission detected coming from this system.[18]

  1. ^ a b c d 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 houk1978 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. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference DeRosa2014 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Hales2017 was invoked but never defined (see the help page).
  10. ^ a b c d e Cite error: The named reference David2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Saffe2008 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Monsk2010 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Nakajima2010 was invoked but never defined (see the help page).
  16. ^ "VSX : Detail for gam Crt". www.aavso.org. Retrieved 2021-03-31.
  17. ^ Cite error: The named reference Ertel2014 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).