Binary star system in the constellation Hydra
! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Apparent magnitude (V)
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | B−V 
 ;/th ; ;/tr ;
 ;/th ; ;/tr ;
17 Crateris is a wide binary star 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. The system is traversing the celestial sphere with a relative proper motion of /y, and is moving away from the Earth with a heliocentric radial velocity of +5.8 km/s.
The dual nature of this system was discovered by W. Herschel in 1783, when they showed an angular separation of . As of 2015, the two components of this system had a separation of along a position angle of 210°. This is equivalent to a projected separation of ; wide enough that, thus far, their orbital track appears linear. They are nearly identical F-type main-sequence stars with a stellar classification of F8V. The primary is slightly brighter at magnitude 5.64, while the secondary is magnitude 5.76.
References.
 ;templatestyles src="Reflist/styles.css" / ;