- Nu Sagittarii
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The Bayer designation Nu Sagittarii (ν Sgr, ν Sagittarii) is shared by two star systems, ν¹ Sagittarii and ν² Sagittarii, in the constellation Sagittarius. The two stars are separated by 0.23° in the sky. Nu Sagittarii also has the traditional name Ain al Rami, from the Arabic عين الرامي cain ar-rāmī meaning eye of the archer[1].
Nu Sagittarii is often cited as one of the earliest identified double stars. In the Almagest, Ptolemy describes the star as "nebulous and double", referring to the double nature of the star, as well as the nearby globular cluster NGC 6717.[citation needed][clarification needed]
ν¹ Sagittarii
ν¹ Sagittarii Observation data
Epoch J2000.0 Equinox J2000.0Constellation Sagittarius Right ascension 18h 54m 10.2s Declination -22° 44' 42" Apparent magnitude (V) +4.86 Distance 1850 ± 900 ly
(570 ± 270 pc)Spectral type K2I+B9V: Other designations Nu-1 Sagittarii is a triple star system lying approximately 1850 light years from Earth. The primary component, Nu-1 Sagittarii A, is a spectral type K1 bright giant which has an apparent magnitude of +4.86. It is orbited by two magnitude +10.8 companions: Nu-1 Sagittarii B at a distance of 2.5 arcseconds from the primary, and Nu-1 Sagittarii C at a distance of 28.2 arcseconds.
ν² Sagittarii
ν² Sagittarii Observation data
Epoch J2000.0 Equinox J2000.0Constellation Sagittarius Right ascension 18h 55m 07.1s Declination -22° 40' 17" Apparent magnitude (V) +5.00 Distance 270 ± 21 ly
(83 ± 6 pc)Spectral type K1Ib/II Other designations Nu-2 Sagittarii A is a spectral type K1 supergiant which has an apparent magnitude of +5.00. It is approximately 270 light years from Earth.
References
Bayer - α (Rukbat)
- β¹ (Arkab Prior)
- β² (Arkab Posterior)
- γ¹
- γ² (Alnasl)
- δ (Kaus Media)
- ε (Kaus Australis)
- ζ (Ascella)
- η
- θ¹
- θ²
- ι
- κ¹
- κ²
- λ (Kaus Borealis)
- μ (Polis)
- ν¹ (Ain al Rami)
- ν²
- ξ¹
- ξ²
- ο
- π (Albaldah)
- ρ¹
- ρ²
- σ (Nunki)
- τ
- υ
- φ (Nanto)
- χ¹
- χ²
- χ³
- ψ
- ω
- b¹
- c
- d
- e¹
- e²
- f
- g
- h¹
- h²
- A
Flamsteed - 3
- 4
- 6
- 7
- 9
- 10 (γ², Alnasl)
- 11
- 13 (μ, Polis)
- 14
- 15
- 16
- 17
- 18
- 19 (δ, Kaus Media)
- 20 (ε, Kaus Australis)
- 21
- 22 (λ, Kaus Borealis)
- 24
- 25
- 26
- 27 (φ, Nanto)
- 28
- 29
- 30
- 32 (ν¹, Ain al Rami)
- 33
- 34 (σ, Nunki)
- 35 (ν²)
- 36 (ξ¹)
- 37 (ξ²)
- 38 (ζ, Ascella)
- 39 (ο)
- 40 (τ)
- 41 (π, Albaldah)
- 42 (ψ)
- 43 (d)
- 44 (ρ¹)
- 45 (ρ²)
- 46 (υ)
- 47 (χ¹)
- 48 (χ²)
- 49 (χ³)
- 50
- 51 (h¹)
- 52 (h²)
- 53
- 54 (e¹)
- 55 (e²)
- 56 (f)
- 57
- 58 (ω)
- 59 (b¹)
- 60 (A)
- 61 (g)
- 62 (c)
- 63
- 65
- 63 Oph
Nearby - Ross 154
- Gliese 783
- Gliese 745
Other - VX
- KW
- Peony Star
- Pistol Star
- QPM-241
- S2
- LBV 1806-20
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