16315+3331 BU  816 (31 Her)

 
 
16h 31m 30.59s +33 30' 49.3" P.A. 222 sep 4.6 mag 7.12,12.20 Sp A2V dist. 125.94 pc (410.82 l.y.)
 
 
Coord 2000
16315+3331
Discov num
BU  816
Comp
Coord arcsec 2000
16 31 30.59 +33 30 49.3
Date first
1881
Date last
1998
Obs
18
Pa first
224
Pa last
222
P.A. Now (θ)
222°
Sep first
5.0
Sep last
4.6
Sep. Now (ρ)
4.6"
Mag pri
7.12
Mag sec
12.20
delta mag (ΔM)
5.08
Spectral class
A2V (white)
Pri motion ra
-021
Sec motion ra
Pri motion dec
-014
Sec motion dec
Notes
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
221.9
Precise sep
4.63
Name
31 Her
Constellation
Hercules
SAO
65360
HIP
80927
Tycho2
2584-01679-1
HD
149141
GC
22235
BD
BD+33 2742
Flamsteed
31 Herculis
Flamsteed name
31 Her
Distance
125.94
Distance ly
410.82
last precise pa
221.9
last precise sep
4.63
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
16315+3331 BU 816 1998 17 222 4.6 6.70 12.20 A2V D 163130.59+333049.3
16315+3331 BU 816 2010 19 238 4.8 7.12 12.20 A2V 163130.59+333049.3

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