15328+1945 HU 577 (HD 138641)
15h 32m 48.18s +19° 44' 36.1" P.A. 25.00 sep 0.3 mag 8.91,8.94 Sp F5 dist. 88.03 pc (287.15 l.y.)
Coord 2000 |
15328+1945 |
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Discov num |
HU 577 |
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Comp |
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Coord arcsec 2000 |
15 32 48.18 +19 44 36.1 |
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Date first |
1902 |
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Date last |
2016 |
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Obs |
82 |
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Pa first |
24 |
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Pa last |
25.1 |
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P.A. Now (θ) |
30.9° |
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Sep first |
0.3 |
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Sep last |
0.347 |
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Sep. Now (ρ) |
0.345" |
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Mag pri |
8.91 |
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Mag sec |
8.94 |
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delta mag (ΔM) |
0.03 |
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Spectral class |
F5 (yellow-white) |
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Pri motion ra |
-029 |
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Sec motion ra |
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Pri motion dec |
+004 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 138641 |
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Constellation |
Serpens |
|
SAO |
101607 |
|
HIP |
76118 |
|
Tycho2 |
1497-00843-1 |
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HD |
138641 |
|
ADS |
9692 |
|
BD |
BD+20 3118 |
|
Distance |
88.03 |
|
Distance ly |
287.15 |
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ORBITAL ELEMENTS
Period (P) | 108.2y | |
Periastron (T) | 1944.45y | |
Semi-major axis (a) | 0.294a | |
Eccentricity (e) | 0.392 | |
Inclination (i) | 61.9° | |
Longitude of periastron (ω) | 127.1° | |
Node (Ω) | 35.6° | |
Notes | n | |
Reference | Sca2020d | |
Equinox | 2000 | |
Last observation | 2020 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
5.8 |
0.299 |
2001 |
7.1 |
0.305 |
2002 |
8.4 |
0.310 |
2003 |
9.7 |
0.315 |
2004 |
11.0 |
0.320 |
2005 |
12.2 |
0.325 |
2006 |
13.3 |
0.329 |
2007 |
14.5 |
0.333 |
2008 |
15.6 |
0.337 |
2009 |
16.7 |
0.340 |
2010 |
17.7 |
0.343 |
2011 |
18.8 |
0.346 |
2012 |
19.8 |
0.348 |
2013 |
20.8 |
0.350 |
2014 |
21.8 |
0.352 |
2015 |
22.8 |
0.353 |
2016 |
23.8 |
0.354 |
2017 |
24.8 |
0.354 |
2018 |
25.8 |
0.354 |
2019 |
26.8 |
0.353 |
2020 |
27.8 |
0.352 |
2021 |
28.8 |
0.350 |
2022 |
29.9 |
0.348 |
2023 |
30.9 |
0.345 |
2024 |
32.0 |
0.341 |
2025 |
33.0 |
0.337 |
2026 |
34.2 |
0.333 |
2027 |
35.3 |
0.327 |
2028 |
36.5 |
0.321 |
2029 |
37.7 |
0.315 |
2030 |
39.0 |
0.307 |
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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