18176-3646 BU 760 AB (Eta Sgr)

 
 
18h 17m 37.73s -36° 45' 40.6" P.A. 110.00 sep 3.5 mag 3.30,8.00 Sp M3.5III dist. 44.74 pc (145.94 l.y.)
 
 
Coord 2000 18176-3646 Discov num BU  760 Comp AB Coord arcsec 2000 18 17 37.73 -36 45 40.6
Date first 1879 Date last 2016 Obs 28
Pa first 100 Pa last 110.3 P.A. Now (θ) 110.3°
Sep first 2.8 Sep last 3.46 Sep. Now (ρ) 3.46"
Mag pri 3.30 Mag sec 8.00 delta mag (ΔM) 4.7 Spectral class M3.5III (red)
Pri motion ra -128 Sec motion ra
Pri motion dec -167 Sec motion dec
Notes N (See Notes)
Nature of this double is uncertain.
 
 
18176-3646 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Eta Sgr 209957 18 17 38 -36 45 41 BU 760 AB 2016 28 110 3.5 3.30 8.00 4.70 <===
Show 209957 18 17 38 -36 45 41 BU 760 AC 2008 4 320 28.3 3.30 13.10 9.80
Show 209957 18 17 38 -36 45 41 BU 760 AD 2010 15 318 93.8 3.30 10.04 6.74
Quadruple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Eta Sgr Constellation Sagittarius SAO 209957 HIP 89642
Tycho2 7404-07057-1 HD 167618 HR 6832 GC 24944
CD CD-3612423 CP CP-36 8128 Bayer Eta Sagittarii Bayer name Eta Sgr
FK5 683 Distance 44.74 Distance ly 145.94 Bayer greek η Sgr