nu1 Sagittarii
{{short description|Triple star system in the constellation Sagittarius}}
{{DISPLAYTITLE:Nu1 Sagittarii}}
{{other stars by Bayer designation|Nu Sagittarii{{!}}ν Sagittarii}}
{{Starbox begin
| name = Nu1 Sagittarii
}}
{{Starbox image
| image =
| caption = Location of ν1 Sagittarii (circled)
}}
{{Starbox observe
| epoch = J2000.0
| constell = Sagittarius
| dec = {{DEC|−22|44|41.4247}}
}}
{{Starbox character
| class = {{nowrap|G2/K1 Ib/II + B9.2p}}
| variable =
}}
{{Starbox astrometry
| parallax = 2.3170
| p_error = 0.2139
}}
{{Starbox detail
| source =
| mass =
| gravity =
| metal_fe =
| rotational_velocity =
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist | name=Ainalrami | B=ν1 Sgr | F=32 Sgr | BD=−22°4907 | HD=174974 | HIP=92761 | HR=7116 | SAO=187426 | WDS=J18542-2245 }}
}}
{{Starbox reference
| Simbad = nu.01+Sgr
}}
{{Starbox end}}
Nu1 Sagittarii (ν1 Sagittarii, abbreviated Nu1 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 {{IPAc-en|E|n|@l|'|r|ei|m|i}}, the traditional name for the system),{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=16 December 2017}} 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){{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|access-date=22 May 2016}} to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.{{cite web | url=https://www.iau.org/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf | page=5 | title=WG Triennial Report (2015-2018) - Star Names |access-date=2018-07-14}} 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.
Observation
On 13 February 2008, it was occulted by Jupiter as viewed from East Asia and the Indian Ocean.{{cite book |date=2002 |first=Jan |last=Meeus |chapter=Mutual occultations of planets |pages=174–185 |title=More Mathematical Astronomy Morsels |isbn=0943396743 |url=https://falakmu.id/khgt/dokumen/More%20mathematical%20astronomy%20morsels%20(Jean%20Meeus)%20(Z-Library).pdf}}{{rp|164}}
References
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}}
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| title=nu01 Sgr | access-date=2017-07-06 | postscript=. }}
{{cite DR2|4075705783885296640}}
}}
{{Stars of Sagittarius|state=collapsed}}
{{DEFAULTSORT:Nu1 Sagittarii}}
Category:Sagittarius (constellation)