02157+2503 COU 79 AB (21 Ari)
02h 15m 42.83s +25° 02' 35.7" P.A. 39.00 sep 0.2 mag 6.40,6.48 Sp F6V dist. 51.07 pc (166.59 l.y.)
| Coord 2000 |
02157+2503 |
|
Discov num |
COU 79 |
|
Comp |
AB |
|
Coord arcsec 2000 |
02 15 42.83 +25 02 35.7 |
|
| Date first |
1965 |
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Date last |
2014 |
|
Obs |
219 |
|
| Pa first |
50 |
|
Pa last |
39.2 |
|
P.A. Now (θ) |
39.2° |
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| Sep first |
0.3 |
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Sep last |
0.195 |
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Sep. Now (ρ) |
0.195" |
|
| Mag pri |
6.40 |
|
Mag sec |
6.48 |
|
delta mag (ΔM) |
0.08 |
|
Spectral class |
F6V (yellow-white) |
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| Pri motion ra |
-088 |
|
Sec motion ra |
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|
| Pri motion dec |
-087 |
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Sec motion dec |
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| Notes |
N
O
W
(See Notes, Orbital solution, ) |
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This double is physical.
02157+2503 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
21 Ari |
75238 |
02 15 43 +25 02 36 |
COU 79 AB |
2014 |
219 |
39 |
0.2 |
6.40 |
6.48 |
0.08 |
Y |
<=== |
| Show |
|
|
02 15 49 +24 58 50 |
RAO 635 Ca,Cb |
2019 |
1 |
150 |
0.7 |
12.20 |
13.90 |
1.70 |
|
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Quadruple system
2 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Name |
21 Ari |
|
Constellation |
Aries |
|
SAO |
75238 |
|
HIP |
10535 |
|
| Tycho2 |
1769-01309-1 |
|
HD |
13872 |
|
HR |
657 |
|
GC |
2706 |
|
| BD |
BD+24 329 |
|
Flamsteed |
21 Arietis |
|
Flamsteed name |
21 Ari |
|
FK5 |
1059 |
|
| Distance |
51.07 |
|
Distance ly |
166.59 |
|
SUSPECTED ORBITAL ELEMENTS
SUSPECTED ORBITAL ELEMENTS SOLUTION #1
| Identifier | 02157+2503 COU 79 A |
| coord_arcsec_2000 | 021542.83+250235.7 |
| Period (P) | 925d (2.53y) | ± 90 |
Periastron (T) | 54092m (2006.976y) | ± 62 |
Semi-major axis (a) | | |
| Eccentricity (e) | 0 | |
Inclination (i) | 71° | ± 45 |
Longitude of periastron (ω) | 0° | |
| Node (Ω) | 211° | ± 55 |
Notes | n | |
Reference | Mut2010e | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 9 | (1=Definitive, 9=Indet.) |
Not enought orbital data to create a graph.
SUSPECTED ORBITAL ELEMENTS
SUSPECTED ORBITAL ELEMENTS SOLUTION #2
| Identifier | 02157+2503 COU 79 |
| coord_arcsec_2000 | 021542.83+250235.7 |
| Period (P) | 8622.7d (23.61y) | ± 4.4 |
Periastron (T) | 46497.2m (1986.182y) | ± 4.3 |
Semi-major axis (a) | 0.2347a | ± 0.0017 |
| Eccentricity (e) | 0.68119 | ± 0.00096 |
Inclination (i) | 104.437° | ± 0.025 |
Longitude of periastron (ω) | 263.927° | ± 0.031 |
| Node (Ω) | 55.823° | ± 0.032 |
Notes | n | |
Reference | Mut2010e | |
| Equinox | 2000 | |
Last observation | 2008 | |
Grade | 2 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
317.9 |
0.097 |
| 2001 |
302.2 |
0.102 |
| 2002 |
288.6 |
0.111 |
| 2003 |
277.4 |
0.124 |
| 2004 |
268.4 |
0.137 |
| 2005 |
261.0 |
0.150 |
| 2006 |
254.5 |
0.158 |
| 2007 |
248.5 |
0.160 |
| 2008 |
242.1 |
0.146 |
| 2009 |
232.2 |
0.099 |
| 2010 |
95.9 |
0.029 |
| 2011 |
57.4 |
0.125 |
| 2012 |
50.5 |
0.170 |
| 2013 |
45.8 |
0.190 |
| 2014 |
41.7 |
0.195 |
| 2015 |
37.6 |
0.192 |
| 2016 |
33.3 |
0.183 |
| 2017 |
28.4 |
0.171 |
| 2018 |
22.7 |
0.157 |
| 2019 |
15.8 |
0.142 |
| 2020 |
7.3 |
0.127 |
| 2021 |
356.5 |
0.113 |
| 2022 |
343.2 |
0.103 |
| 2023 |
327.8 |
0.097 |
| 2024 |
311.6 |
0.098 |
| 2025 |
296.6 |
0.105 |
| 2026 |
283.9 |
0.116 |
| 2027 |
273.7 |
0.129 |
| 2028 |
265.3 |
0.142 |
| 2029 |
258.4 |
0.154 |
| 2030 |
252.2 |
0.160 |
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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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