18553-2618 SMY   4AB (Nunki)

 
 
18h 55m 15.92s -26 17' 48.2" P.A. 239 sep 349 mag 2.04,9.95 Sp B2.5V
 
 
Coord 2000
18553-2618
Discov num
SMY   4
Comp
AB
Coord arcsec 2000
18 55 15.92 -26 17 48.2
Date first
1837
Date last
1999
Obs
4
Pa first
244
Pa last
239
P.A. Now (θ)
239°
Sep first
309.0
Sep last
349.0
Sep. Now (ρ)
349"
Mag pri
2.04
Mag sec
9.95
delta mag (ΔM)
7.91
Spectral class
B2.5V (blue-white)
Pri motion ra
+013
Sec motion ra
+001
Pri motion dec
-054
Sec motion dec
-011
Notes
N U (See Notes, Proper motion indicates non-physical)
This double is not physical.
 
 
18553-2618 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 187448 18553-2618 BED 1 Aa,Ab 1991 1991 1 202 0.0 2.04
Show Nunki 187448 18553-2618 SMY 4 AB 1837 1999 4 239 349.0 2.04 9.95 7.91 <===
Triple system
2 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name
Nunki
Meaning
the Sumerian god of the waters 'Enki'
Other names
SADIRA
Constellation
Sagittarius
SAO
187448
HD
175191
HR
7121
Bayer
Sigma Sagittarii
Bayer name
Sig Sgr
Flamsteed
34 Sagittarii
Flamsteed name
34 Sgr
last precise pa
239.1
last precise sep
348.965
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18553-2618 SMY 4 AB 1837 1 244 309.0 2.02 9.50 B2.5V N 185515.92-261747.7
18553-2618 SMY 4 AB 1998 2 239 348.7 2.04 9.95 B2.5V N D 185515.92-261748.2
18553-2618 SMY 4 AB 1999 4 239 349.0 2.04 9.95 B2.5V NUD 185515.92-261748.2

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