02157+2503 COU  79 (21 Ari)

 
 
02H 15M 42.83S +25 02' 35.7" P.A. 39 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
Coord arcsec 2000
02 15 42.83 +25 02 35.7
Date first
1965
Date last
2014
Obs
218
Pa first
50
Pa last
39
P.A. Now (θ)
39°
Sep first
0.3
Sep last
0.2
Sep. Now (ρ)
0.2"
Mag pri
6.40
Mag sec
6.48
delta mag (ΔM)
0.08
Spectral class
F6V (yellow-white)
Pri motion ra
-088
Sec motion ra
Pri motion dec
-087
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
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
Distance
51.07
Distance ly
166.59
last precise pa
39.2
last precise sep
0.195
 
 
ORBITAL ELEMENTS SOLUTION #1
 
 
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)
Node (Ω)211°± 55 Note Grade9(1=Definitive, 9=Indet.)
Equinox2000 Last observation2008
label rho theta
2000-01-01
2001-01-01
2002-01-01
2003-01-01
2004-01-01
2005-01-01
2006-01-01
2007-01-01
2008-01-01
2009-01-01
2010-01-01
2011-01-01
2012-01-01
2013-01-01
2014-01-01
2015-01-01
2016-01-01
2017-01-01
2018-01-01
2019-01-01
2020-01-01
2021-01-01
2022-01-01
2023-01-01
2024-01-01
2025-01-01
2026-01-01
2027-01-01
2028-01-01
2029-01-01
2030-01-01

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

grafico orbita





 
 
ORBITAL ELEMENTS SOLUTION #2
 
 
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 Note Grade2(1=Definitive, 9=Indet.)
Equinox2000 Last observation2008
label rho theta
2000 0.097 317.9
2001 0.102 302.2
2002 0.111 288.6
2003 0.124 277.4
2004 0.137 268.4
2005 0.150 261.0
2006 0.158 254.5
2007 0.160 248.5
2008 0.146 242.1
2009 0.099 232.2
2010 0.029 95.9
2011 0.125 57.4
2012 0.170 50.5
2013 0.190 45.8
2014 0.195 41.7
2015 0.192 37.6
2016 0.183 33.3
2017 0.171 28.4
2018 0.157 22.7
2019 0.142 15.8
2020 0.127 7.3
2021 0.113 356.5
2022 0.103 343.2
2023 0.097 327.8
2024 0.098 311.6
2025 0.105 296.6
2026 0.116 283.9
2027 0.129 273.7
2028 0.142 265.3
2029 0.154 258.4
2030 0.160 252.2

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic