18553-2618 SMY 4 AB (Nunki)
18h 55m 15.92s -26° 17' 48.2" P.A. 239.00 sep 349.0 mag 2.04,9.95 Sp B2.5V dist. 69.83 pc (227.79 l.y.)
| 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 |
239.1 |
|
P.A. Now (θ) |
239.1° |
|
| Sep first |
309.0 |
|
Sep last |
348.965 |
|
Sep. Now (ρ) |
348.965" |
|
| 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) |
|
rPM=0.804
This double is not physical.
18553-2618 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
187448 |
18 55 16 -26 17 48 |
BED 1 Aa,Ab |
1991 |
1 |
202 |
0.0 |
2.04 |
|
|
|
|
| Show |
Nunki |
187448 |
18 55 16 -26 17 48 |
SMY 4 AB |
1999 |
4 |
239 |
349.0 |
2.04 |
9.95 |
7.91 |
|
<=== |
Triple system
2 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Nunki |
|
Constellation |
Sagittarius |
|
SAO |
187448 |
|
HIP |
92855 |
|
| Tycho2 |
6868-01829-1 |
|
HD |
175191 |
|
HR |
7121 |
|
GC |
25941 |
|
| CD |
CD-2613595 |
|
CP |
CP-26 6590 |
|
Bayer |
Sigma Sagittarii |
|
Bayer name |
Sig Sgr |
|
| Flamsteed |
34 Sagittarii |
|
Flamsteed name |
34 Sgr |
|
FK5 |
706 |
|
Distance |
69.83 |
|
| Distance ly |
227.79 |
|
Bayer greek |
σ Sgr |
|
| Meaning |
the Sumerian god of the waters 'Enki' |
|
