Eta Crateris

η Crateris
Location of η Crateris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Crater
Right ascension 11h 56m 00.95323s[1]
Declination −17° 09′ 02.9781″[1]
Apparent magnitude (V) 5.17[2]
Characteristics
Spectral type A0 V[3]
U−B color index −0.06[2]
B−V color index −0.03[2]
Astrometry
Radial velocity (Rv)+15.0±4.2[4] km/s
Proper motion (μ) RA: −49.74[1] mas/yr
Dec.: −7.58[1] mas/yr
Parallax (π)12.97 ± 0.23 mas[1]
Distance251 ± 4 ly
(77 ± 1 pc)
Absolute magnitude (MV)+1.00[5]
Details
Radius2.7[6] R☉
Luminosity48.5[7] L☉
Temperature9,687[7] K
Rotational velocity (v sin i)65[3] km/s
Age350[5] Myr
Other designations
η Crt, 30 Crateris, BD−16°3358, FK5 1309, HD 103632, HIP 58188, HR 4567, SAO 156988[8]
Database references
SIMBADdata

Eta Crateris, Latinized from η Crateris, is a solitary[9] star in the southern constellation of Crater. It marks the lip of the tilted bowl on the left side in the constellation. Eta Crateris lies in the sky NE of Zeta Crateris and NNW of 31 Crateris, the three stars forming an almost perfect right triangle with Eta at the right angle and 31 and Zeta the ends of the hypotenuse. Eta Crateris also lies to the right (west) of the bright star Gamma Corvi.

This star is faintly visible to the naked eye with an apparent visual magnitude of 5.17.[2] With an annual parallax shift of 12.97 mas as seen from Earth,[1] it is located around 280 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.08 due to interstellar dust.[5] The star is receding from the Sun with a radial velocity of +15 km/s.[4]

Eta Crateris is an ordinary A-type main sequence star with a stellar classification of A0 V.[3] It is about 2.7[6] times the radius of the Sun and radiates 48.5 times the solar luminosity from its outer atmosphere at an effective temperature of 9,687 K.[7] It 350[5] million years old and is spinning with a projected rotational velocity of 65 km/s.[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 d Cite error: The named reference Royer2007 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference PasinettiFracassini2001 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 Eggleton2008 was invoked but never defined (see the help page).