18213-0254 STFB  8 (Eta Ser)

 
 
18h 21m 18.60s -02 53' 55.8" P.A. 54 sep 251.4 mag 3.34,10.87 Sp K2IIIab dist. 18.54 pc (60.48 l.y.)
 
 
Coord 2000
18213-0254
Discov num
STFB  8
Comp
Coord arcsec 2000
18 21 18.60 -02 53 55.8
Date first
1835
Date last
2010
Obs
25
Pa first
77
Pa last
54
P.A. Now (θ)
54°
Sep first
110.9
Sep last
251.4
Sep. Now (ρ)
251.4"
Mag pri
3.34
Mag sec
10.87
delta mag (ΔM)
7.53
Spectral class
K2IIIab (yellow-orange)
Pri motion ra
-548
Sec motion ra
+000
Pri motion dec
-701
Sec motion dec
-007
Notes
N L U (See Notes, Linear solution, Proper motion indicates non-physical)
rPM=0.994
This double is not physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
54.2
Precise sep
251.38
Name
Eta Ser
Constellation
Serpens
SAO
142241
HIP
89962
Tycho2
5102-00416-1
HD
168723
HR
6869
GC
25046
GL
Gl 711
BD
BD-02 4599
Bayer
Eta Serpentis
Bayer name
Eta Ser
Flamsteed
58 Serpentis
Flamsteed name
58 Ser
Distance
18.54
Distance ly
60.48
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
18213-0254 STFB 8 1999 21 55 242.9 3.34 10.87 K2IIIab NLD 182118.60-025355.8
18213-0254 STFB 8 2009 22 55 250.8 3.34 10.87 K2IIIab NLD 182118.60-025355.8
18213-0254 STFB 8 2010 25 54 251.4 3.34 10.87 K2IIIab NL U 182118.60-025355.8

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