19138+3909 STF 2487 AB (Aladfar)
19h 13m 45.49s +39° 08' 45.5" P.A. 81.00 sep 28.4 mag 4.38,8.58 Sp B2.5IV dist. 425.53 pc (1388.08 l.y.)
| Coord 2000 |
19138+3909 |
|
Discov num |
STF2487 |
|
Comp |
AB |
|
Coord arcsec 2000 |
19 13 45.49 +39 08 45.5 |
|
| Date first |
1777 |
|
Date last |
2017 |
|
Obs |
74 |
|
| Pa first |
90 |
|
Pa last |
80.9 |
|
P.A. Now (θ) |
80.9° |
|
| Sep first |
26.0 |
|
Sep last |
28.36 |
|
Sep. Now (ρ) |
28.36" |
|
| Mag pri |
4.38 |
|
Mag sec |
8.58 |
|
delta mag (ΔM) |
4.2 |
|
Spectral class |
B2.5IV (blue-white) |
|
| Pri motion ra |
-001 |
|
Sec motion ra |
+003 |
|
| Pri motion dec |
-001 |
|
Sec motion dec |
+007 |
|
| Notes |
N
(See Notes) |
|
rPM=1.174
This double is not physical.
19138+3909 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Aladfar |
68010 |
19 13 45 +39 08 46 |
STF 2487 AB |
2017 |
74 |
81 |
28.4 |
4.38 |
8.58 |
4.20 |
|
<=== |
| Show |
|
68010 |
19 13 45 +39 08 46 |
STF 2487 AC |
2014 |
10 |
151 |
161.5 |
4.38 |
11.42 |
7.04 |
|
|
Triple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Aladfar |
|
Var name |
NSV11839 Lyr |
|
Constellation |
Lyra |
|
SAO |
68010 |
|
| HIP |
94481 |
|
Tycho2 |
3121-02285-1 |
|
Gaia DR2 |
2099679223187100800 |
|
HD |
180163 |
|
| HR |
7298 |
|
GC |
26507 |
|
ADS |
12197 |
|
BD |
BD+38 3490 |
|
| Bayer |
Eta Lyrae |
|
Bayer name |
Eta Lyr |
|
Flamsteed |
20 Lyrae |
|
Flamsteed name |
20 Lyr |
|
| Distance |
425.53 |
|
Distance ly |
1388.08 |
|
Bayer greek |
η Lyr |
|
| Meaning |
claws (with? LYR) |
|
