20591+0418 STF 2737 AB
20h 59m 04.54s +04° 17' 37.8" P.A. 109.00 sep 0.1 mag 5.96,6.31 Sp F6IV dist. 204.5 pc (667.08 l.y.)
| Coord 2000 |
20591+0418 |
|
Discov num |
STF2737 |
|
Comp |
AB |
|
Coord arcsec 2000 |
20 59 04.54 +04 17 37.8 |
|
| Date first |
1835 |
|
Date last |
2023 |
|
Obs |
517 |
|
| Pa first |
294 |
|
Pa last |
108.7 |
|
P.A. Now (θ) |
105.7° |
|
| Sep first |
0.4 |
|
Sep last |
0.123 |
|
Sep. Now (ρ) |
0.185" |
|
| Mag pri |
5.96 |
|
Mag sec |
6.31 |
|
delta mag (ΔM) |
0.35 |
|
Spectral class |
F6IV (yellow-white) |
|
| Pri motion ra |
-102 |
|
Sec motion ra |
-102 |
|
| Pri motion dec |
-152 |
|
Sec motion dec |
-152 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
20591+0418 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
126428 |
20 59 05 +04 17 38 |
STF 2737 AB |
2023 |
517 |
109 |
0.1 |
5.96 |
6.31 |
0.35 |
Y |
<=== |
| Show |
Eps Equ |
126428 |
20 59 05 +04 17 38 |
STF 2737 AB,C |
2023 |
308 |
67 |
10.6 |
5.30 |
7.05 |
1.75 |
|
|
| Show |
|
126428 |
20 59 05 +04 17 38 |
STF 2737 AD |
2013 |
4 |
293 |
69.3 |
5.96 |
13.10 |
7.14 |
|
|
| Show |
|
126428 |
20 59 04 +04 17 37 |
STF 2737 BC |
2019 |
19 |
66 |
10.6 |
6.31 |
7.05 |
0.74 |
|
|
Quadruple system
5 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Constellation |
Equuleus |
|
SAO |
126428 |
|
HIP |
103579 |
|
Tycho2 |
0521-02814-1 |
|
| HD |
199766 |
|
HR |
8034 |
|
GC |
29276 |
|
ADS |
14499 |
|
| BD |
BD+03 4473 |
|
Bayer |
Epsilon Equulei |
|
Bayer name |
Eps Equ |
|
Flamsteed |
1 Equulei |
|
| Flamsteed name |
1 Equ |
|
Distance |
204.5 |
|
Distance ly |
667.08 |
|
Bayer greek |
ε Equ |
|
ORBITAL ELEMENTS
| Period (P) | 98y | ± 1.1 |
Periastron (T) | 60608m (2024.816y) | ± 13 |
Semi-major axis (a) | 590.6m | ± 2.2 |
| Eccentricity (e) | 0.712 | ± 0.003 |
Inclination (i) | 92.286° | ± 0.019 |
Longitude of periastron (ω) | 350.7° | ± 0.9 |
| Node (Ω) | 106.024° | ± 0.023 |
Notes | n | |
Reference | CIA2022f | |
| Equinox | | |
Last observation | | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
285.4 |
0.802 |
| 2001 |
285.4 |
0.781 |
| 2002 |
285.3 |
0.759 |
| 2003 |
285.2 |
0.736 |
| 2004 |
285.2 |
0.712 |
| 2005 |
285.1 |
0.686 |
| 2006 |
285.0 |
0.658 |
| 2007 |
284.9 |
0.629 |
| 2008 |
284.8 |
0.599 |
| 2009 |
284.7 |
0.567 |
| 2010 |
284.6 |
0.533 |
| 2011 |
284.5 |
0.498 |
| 2012 |
284.3 |
0.460 |
| 2013 |
284.1 |
0.421 |
| 2014 |
283.9 |
0.379 |
| 2015 |
283.6 |
0.335 |
| 2016 |
283.2 |
0.288 |
| 2017 |
282.7 |
0.239 |
| 2018 |
281.9 |
0.187 |
| 2019 |
280.5 |
0.133 |
| 2020 |
276.9 |
0.076 |
| 2021 |
251.2 |
0.019 |
| 2022 |
117.7 |
0.045 |
| 2023 |
109.9 |
0.101 |
| 2024 |
107.6 |
0.147 |
| 2025 |
106.2 |
0.170 |
| 2026 |
104.9 |
0.166 |
| 2027 |
103.4 |
0.139 |
| 2028 |
100.9 |
0.100 |
| 2029 |
94.5 |
0.056 |
| 2030 |
45.2 |
0.015 |
| 2031 |
305.5 |
0.043 |
| 2032 |
296.1 |
0.089 |
| 2033 |
293.0 |
0.134 |
| 2034 |
291.5 |
0.178 |
| 2035 |
290.6 |
0.221 |
| 2036 |
290.0 |
0.262 |
| 2037 |
289.6 |
0.302 |
| 2038 |
289.2 |
0.341 |
| 2039 |
288.9 |
0.377 |
| 2040 |
288.7 |
0.413 |
| 2041 |
288.5 |
0.447 |
| 2042 |
288.3 |
0.480 |
| 2043 |
288.2 |
0.512 |
| 2044 |
288.1 |
0.542 |
| 2045 |
288.0 |
0.571 |
| 2046 |
287.9 |
0.599 |
| 2047 |
287.8 |
0.626 |
| 2048 |
287.7 |
0.652 |
| 2049 |
287.6 |
0.677 |
| 2050 |
287.5 |
0.701 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
Measures: green=micrometric, blue=interferometric, purple=photographic
|
|
