Nu1 Sagittarii

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Nu1 Sagittarii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.86[2]
Characteristics
Spectral type G2/K1 Ib/II + B9.2p[3]
U−B Template:Engvar +1.34[2]
B−V Template:Engvar +1.43[2]
Astrometry
Radial velocity (Rv)−11.57[4] km/s
Proper motion (μ) RA: +4.291[4] mas/yr
Dec.: −7.786[4] mas/yr
Parallax (π)2.3170±0.2139 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−3.91[5]
Details
Radius101[4] Template:Solar radius
Luminosity3,464[4] Template:Solar luminosity
Temperature4,401[4] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[6]
Database references
SIMBADdata

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Nu1 Sagittarii (ν1 Sagittarii, abbreviated Nu1 Sgr, ν1 Sgr) is a triple star system[7] about 1,100 light-years from Earth. Its three components are designated Nu1 Sagittarii A (officially named Ainalrami Template:IPAc-en, the traditional name for the system),[8] B and C.[9] A and B themselves form a spectroscopic binary.[7] 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'.[10] In 2016, the IAU organized a Working Group on Star Names (WGSN)[11] to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[12] 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.[8]

Nu1 and Nu2 Sagittarii, together with Tau Sagittarii, Psi Sagittarii, Omega Sagittarii, 60 Sagittarii and Zeta Sagittarii were Al Udḥiyy, the Ostrich's Nest.[10]

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.[13] In 1982 it was found to have a hotter companion, Nu1 Sagittarii B, a rapidly rotating B9 type star.[14] The pair orbit with a period of around 370 days.[7] A magnitude +11.2 companion, component C,[9] is orbiting further out at an angular separation of 2.5 arcseconds from the primary.[7]

Observation

On 13 February 2008, it was occulted by Jupiter as viewed from East Asia and the Indian Ocean.[15]Template:Rp

References

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  6. ↑ Template:Cite simbad
  7. ↑ a b c d Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Sagittarius

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