17220+5638 ES 2657 AB (HD 157787)
17h 22m 02.03s +56° 37' 42.4" P.A. 97.00 sep 28.4 mag 8.60,11.20 Sp A3V dist. 271.74 pc (886.42 l.y.)
| Coord 2000 |
17220+5638 |
|
Discov num |
ES 2657 |
|
Comp |
AB |
|
Coord arcsec 2000 |
17 22 02.03 +56 37 42.4 |
|
| Date first |
1907 |
|
Date last |
2016 |
|
Obs |
12 |
|
| Pa first |
93 |
|
Pa last |
96.8 |
|
P.A. Now (θ) |
96.8° |
|
| Sep first |
30.5 |
|
Sep last |
28.396 |
|
Sep. Now (ρ) |
28.396" |
|
| Mag pri |
8.60 |
|
Mag sec |
11.20 |
|
delta mag (ΔM) |
2.6 |
|
Spectral class |
A3V (white) |
|
| Pri motion ra |
+004 |
|
Sec motion ra |
-019 |
|
| Pri motion dec |
-013 |
|
Sec motion dec |
-034 |
|
| Notes |
U
(Proper motion indicates non-physical) |
|
rPM=0.8
This double is not physical.
17220+5638 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
HD 157787 |
30359 |
17 22 02 +56 37 42 |
ES 2657 AB |
2016 |
12 |
97 |
28.4 |
8.60 |
11.20 |
2.60 |
|
<=== |
| Show |
|
30359 |
17 22 02 +56 37 42 |
ES 2657 AC |
2016 |
9 |
90 |
39.2 |
8.60 |
11.50 |
2.90 |
|
|
| Show |
|
30359 |
17 22 02 +56 37 42 |
ABH 90 AD |
2015 |
7 |
114 |
83.7 |
8.65 |
14.67 |
6.02 |
|
|
| Show |
|
|
17 22 05 +56 37 40 |
ES 2657 BC |
2016 |
13 |
73 |
11.7 |
11.20 |
11.50 |
0.30 |
|
|
Quadruple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 157787 |
|
Constellation |
Draco |
|
SAO |
30359 |
|
HIP |
84973 |
|
| Tycho2 |
3896-01299-1 |
|
Gaia DR2 |
1420829955235900928 |
|
HD |
157787 |
|
BD |
BD+56 1977 |
|
| Distance |
271.74 |
|
Distance ly |
886.42 |
|
