Triple star system in the constellation Sagittarius
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000.0
       Equinox J2000.0 (ICRS)
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! 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" | U−B 
! style="text-align:left" | B−V 
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Nu1 Sagittarii (ν1 Sagittarii, abbreviated Nu Sgr, ν1 Sgr) is a triple star system about 1,100 light-years from Earth. Its three components are designated Nu1 Sagittarii A (officially named Ainalrami , the traditional name for the system), B and C. A and B themselves form a spectroscopic binary. The system is 0.11 degree north of the ecliptic.
Nomenclature.
"ν1 Sagittarii" (Latinised to "Nu1 Sagittarii") is the system's Bayer designation.
Nu1 and Nu2 Sagittarii (together designated Nu Sagittarii) bore the traditional name "Ain al Rami", which is from the Arabic عين الرامي "ʽain al-rāmī" meaning 'eye of the archer'. In 2016, the IAU organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. It approved the name "Ainalrami" for the component Nu1 Sagittarii A on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.
Nu1 and Nu2 Sagittarii, together with Tau Sagittarii, Psi Sagittarii, Omega Sagittarii, 60 Sagittarii and Zeta Sagittarii were "Al Udḥiyy", the Ostrich's Nest.
Properties.
Nu1 Sagittarii A is a spectral type K1 bright giant which has an apparent magnitude of +4.86. It is a microvariable with a frequency of 0.43398 cycles per day and an amplitude of 0.0078 magnitude. In 1982 it was found to have a hotter companion, Nu1 Sagittarii B, a rapidly rotating B9 type star. The pair orbit with a period of around 370 days. A magnitude +11.2 companion, component C, is orbiting further out at an angular separation of 2.5 arcseconds from the primary.
References.
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