17 Crateris

17 Crateris
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
17 Crt A
Right ascension 11h 32m 16.40436s[1]
Declination −29° 15′ 39.6740″[1]
Apparent magnitude (V) 5.64[2]
17 Crt B
Right ascension 11h 32m 16.03998s[1]
Declination −29° 15′ 47.8935″[1]
Apparent magnitude (V) 5.76[2]
Characteristics
Spectral type F8V + F8V[2]
B−V color index 0.540±0.004[3]
Astrometry
17 Crt A
Radial velocity (Rv)+5.8±0.4[4] km/s
Proper motion (μ) RA: −19.601[1] mas/yr
Dec.: +144.524[1] mas/yr
Parallax (π)36.0601 ± 0.1266 mas[1]
Distance90.4 ± 0.3 ly
(27.73 ± 0.10 pc)
17 Crt B
Proper motion (μ) RA: −22.025[1] mas/yr
Dec.: +139.982[1] mas/yr
Parallax (π)35.9838 ± 0.1320 mas[1]
Distance90.6 ± 0.3 ly
(27.8 ± 0.1 pc)
Details[5]
17 Crt A
Mass1.20 M☉
Luminosity3.2 L☉
Surface gravity (log g)4.17 cgs
Temperature6,240 K
Metallicity [Fe/H]0.04±0.15[6] dex
Rotational velocity (v sin i)10.0 km/s
Age3.95 Gyr
17 Crt B
Mass1.18 M☉
Luminosity2.8 L☉
Surface gravity (log g)4.20 cgs
Temperature6,269 K
Metallicity [Fe/H]−0.06±0.15[6] dex
Rotational velocity (v sin i)9.6 km/s
Age3.67 Gyr
Other designations
17 Crt, CD−28°8928, HIP 56280, ADS 8202, CCDM J11323-2916AB, WDS J11323-2916[7]
17 Crt A: HD 100287, HR 4444, SAO 179968
17 Crt B: HD 100286, HR 4443, SAO 179967
Database references
SIMBADdata

17 Crateris is a wide binary star[8] system in the equatorial constellation of Hydra, located 90.5 light years away from the Sun. It is visible to the naked eye as a faint, yellow-white hued star with a combined apparent visual magnitude of 4.93.[3] The system is traversing the celestial sphere with a relative proper motion of 24.9 mas/y,[9] and is moving away from the Earth with a heliocentric radial velocity of +5.8 km/s.[4]

The dual nature of this system was discovered by W. Herschel in 1783, when they showed an angular separation of 9.8″. As of 2015, the two components of this system had a separation of 9.60″ along a position angle of 210°.[10] This is equivalent to a projected separation of 241.3 AU; wide enough that, thus far, their orbital track appears linear.[9] They are nearly identical F-type main-sequence stars with a stellar classification of F8V.[2] The primary is slightly brighter at magnitude 5.64, while the secondary is magnitude 5.76.[2]

  1. ^ a b c d e f g h i j Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference gray2001 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Earle2017 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gáspár2016 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 Eggleton2008 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Tokovinin2016 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).