20591+0418 STF 2737 AB
20h 59m 04.54s +04° 17' 37.8" P.A. 125.00 sep 0.0 mag 5.96,6.31 Sp F6IV dist. 54.08 pc (176.41 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 |
2021 |
|
Obs |
487 |
|
| Pa first |
294 |
|
Pa last |
124.7 |
|
P.A. Now (θ) |
109.3° |
|
| Sep first |
0.4 |
|
Sep last |
0.031 |
|
Sep. Now (ρ) |
0.108" |
|
| 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 |
2021 |
487 |
125 |
0.0 |
5.96 |
6.31 |
0.35 |
Y |
<=== |
| Show |
Eps Equ |
126428 |
20 59 05 +04 17 38 |
STF 2737 AB,C |
2019 |
306 |
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 |
103569 |
|
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 |
54.08 |
|
Distance ly |
176.41 |
|
Bayer greek |
ε Equ |
|
ORBITAL ELEMENTS
| Period (P) | 104y | |
Periastron (T) | 1920.75y | |
Semi-major axis (a) | 0.609a | |
| Eccentricity (e) | 0.692 | |
Inclination (i) | 92.4° | |
Longitude of periastron (ω) | 343.3° | |
| Node (Ω) | 105.3° | |
Notes | n | |
Reference | Tok2017c | |
| Equinox | 2000 | |
Last observation | 2017 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
284.8 |
0.805 |
| 2001 |
284.8 |
0.784 |
| 2002 |
284.7 |
0.763 |
| 2003 |
284.6 |
0.740 |
| 2004 |
284.6 |
0.715 |
| 2005 |
284.5 |
0.690 |
| 2006 |
284.4 |
0.662 |
| 2007 |
284.3 |
0.634 |
| 2008 |
284.2 |
0.603 |
| 2009 |
284.1 |
0.571 |
| 2010 |
284.0 |
0.537 |
| 2011 |
283.8 |
0.501 |
| 2012 |
283.7 |
0.464 |
| 2013 |
283.5 |
0.424 |
| 2014 |
283.2 |
0.381 |
| 2015 |
282.9 |
0.337 |
| 2016 |
282.5 |
0.289 |
| 2017 |
282.0 |
0.239 |
| 2018 |
281.1 |
0.186 |
| 2019 |
279.5 |
0.131 |
| 2020 |
275.4 |
0.073 |
| 2021 |
239.5 |
0.016 |
| 2022 |
116.4 |
0.051 |
| 2023 |
109.3 |
0.108 |
| 2024 |
107.1 |
0.155 |
| 2025 |
105.7 |
0.185 |
| 2026 |
104.7 |
0.193 |
| 2027 |
103.6 |
0.181 |
| 2028 |
102.2 |
0.156 |
| 2029 |
100.2 |
0.123 |
| 2030 |
96.5 |
0.086 |
|
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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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