21051+0757 HDS 3004 AB
21h 05m 07.95s +07° 56' 44.4" P.A. 252.00 sep 0.3 mag 7.98,11.81 Sp G5 dist. 50.35 pc (164.24 l.y.)
| Coord 2000 |
21051+0757 |
|
Discov num |
HDS3004 |
|
Comp |
AB |
|
Coord arcsec 2000 |
21 05 07.95 +07 56 44.4 |
|
| Date first |
1991 |
|
Date last |
2021 |
|
Obs |
22 |
|
| Pa first |
309 |
|
Pa last |
252 |
|
P.A. Now (θ) |
252° |
|
| Sep first |
0.4 |
|
Sep last |
0.264 |
|
Sep. Now (ρ) |
0.264" |
|
| Mag pri |
7.98 |
|
Mag sec |
11.81 |
|
delta mag (ΔM) |
3.83 |
|
Spectral class |
G5 (yellow) |
|
| Pri motion ra |
+005 |
|
Sec motion ra |
|
|
| Pri motion dec |
-089 |
|
Sec motion dec |
|
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
21051+0757 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
126530 |
21 05 08 +07 56 44 |
HDS 3004 AB |
2021 |
22 |
252 |
0.3 |
7.98 |
11.81 |
3.83 |
Y |
<=== |
| Show |
TV Equ |
126530 |
21 05 08 +07 56 44 |
MET 90 AC |
2003 |
1 |
354 |
4.3 |
6.39 |
17.59 |
11.20 |
|
|
| Show |
|
126530 |
21 05 08 +07 56 44 |
MET 90 AD |
2003 |
1 |
166 |
9.8 |
6.39 |
18.09 |
11.70 |
|
|
Quadruple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Var name |
TV Equ |
|
Constellation |
Equuleus |
|
SAO |
126530 |
|
HIP |
104075 |
|
| Tycho2 |
1104-01779-1 |
|
Gaia DR2 |
1737234316120828800 |
|
HD |
200746 |
|
BD |
BD+07 4621 |
|
| Distance |
50.35 |
|
Distance ly |
164.24 |
|
ORBITAL ELEMENTS
| Period (P) | 80.42y | ± 163.73 |
Periastron (T) | 2016.78y | ± 1.39 |
Semi-major axis (a) | 0.463a | ± 0.326 |
| Eccentricity (e) | 0.691 | ± 0.062 |
Inclination (i) | 58° | ± 21.2 |
Longitude of periastron (ω) | 48.7° | ± 63.5 |
| Node (Ω) | 88.1° | ± 32.2 |
Notes | | |
Reference | Tok2015c | |
| Equinox | 2000 | |
Last observation | 2014 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
341.4 |
0.318 |
| 2001 |
345.2 |
0.304 |
| 2002 |
349.3 |
0.290 |
| 2003 |
353.9 |
0.277 |
| 2004 |
358.9 |
0.265 |
| 2005 |
4.4 |
0.253 |
| 2006 |
10.4 |
0.243 |
| 2007 |
16.9 |
0.234 |
| 2008 |
23.8 |
0.226 |
| 2009 |
31.2 |
0.220 |
| 2010 |
39.0 |
0.215 |
| 2011 |
47.2 |
0.210 |
| 2012 |
55.7 |
0.205 |
| 2013 |
64.7 |
0.199 |
| 2014 |
74.4 |
0.189 |
| 2015 |
85.7 |
0.171 |
| 2016 |
100.8 |
0.141 |
| 2017 |
126.4 |
0.102 |
| 2018 |
173.3 |
0.084 |
| 2019 |
214.9 |
0.113 |
| 2020 |
235.0 |
0.163 |
| 2021 |
245.5 |
0.214 |
| 2022 |
252.0 |
0.261 |
| 2023 |
256.7 |
0.304 |
| 2024 |
260.2 |
0.342 |
| 2025 |
263.0 |
0.377 |
| 2026 |
265.4 |
0.408 |
| 2027 |
267.5 |
0.436 |
| 2028 |
269.3 |
0.462 |
| 2029 |
270.9 |
0.485 |
| 2030 |
272.4 |
0.506 |
| 2031 |
273.8 |
0.525 |
| 2032 |
275.1 |
0.542 |
| 2033 |
276.3 |
0.557 |
| 2034 |
277.5 |
0.571 |
| 2035 |
278.6 |
0.583 |
| 2036 |
279.7 |
0.594 |
| 2037 |
280.7 |
0.604 |
| 2038 |
281.7 |
0.613 |
| 2039 |
282.6 |
0.620 |
| 2040 |
283.6 |
0.626 |
| 2041 |
284.5 |
0.631 |
| 2042 |
285.4 |
0.636 |
| 2043 |
286.3 |
0.639 |
| 2044 |
287.2 |
0.641 |
| 2045 |
288.1 |
0.643 |
| 2046 |
289.0 |
0.643 |
| 2047 |
289.9 |
0.643 |
| 2048 |
290.8 |
0.642 |
| 2049 |
291.7 |
0.641 |
| 2050 |
292.6 |
0.638 |
|
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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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