20444+1945 CAR   2

 
 
20h 44m 21.94s +19 44' 57.9" P.A. 44 sep 0.3 mag 10.29,11.60 dist. 21.08 pc (68.76 l.y.)
 
 
Coord 2000
20444+1945
Discov num
CAR   2
Comp
Coord arcsec 2000
20 44 21.94 +19 44 57.9
Date first
2000
Date last
2009
Obs
6
Pa first
334
Pa last
44
P.A. Now (θ)
44°
Sep first
0.2
Sep last
0.3
Sep. Now (ρ)
0.3"
Mag pri
10.29
Mag sec
11.60
delta mag (ΔM)
1.31
Spectral class
Pri motion ra
-016
Sec motion ra
Pri motion dec
-600
Sec motion dec
Notes
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
44
Precise sep
0.334
Spectr
M2
Constellation
Delphinus
HIP
102357
Tycho2
1642-02848-1
HD
352860
GL
Gl 804
BD
BD+19 4499
Distance
21.08
Distance ly
68.76
last precise pa
44
last precise sep
0.334
 
 
ORBITAL ELEMENTS
 
 
Period (P)14.309y± 0.149 Periastron (T)2004.439y± 0.148 Semi-major axis (a)0.2781a± 0.0051
Eccentricity (e)0.587± 0.078 Inclination (i)129.4°± 2.9 Longitude of periastron (ω)247.6°± 8
Node (Ω)81.2°± 4 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2009
label rho theta
2000 0.250 349.2
2001 0.231 331.8
2002 0.213 311.5
2003 0.190 287.1
2004 0.126 248.4
2005 0.109 122.3
2006 0.225 83.4
2007 0.290 68.5
2008 0.322 57.9
2009 0.333 48.7
2010 0.331 39.6
2011 0.319 30.2
2012 0.301 19.8
2013 0.279 7.9
2014 0.257 354.0
2015 0.236 337.5
2016 0.219 318.1
2017 0.199 295.2
2018 0.154 264.1
2019 0.077 160.7
2020 0.195 90.4
2021 0.274 72.4
2022 0.315 61.0
2023 0.332 51.5
2024 0.333 42.5
2025 0.324 33.2
2026 0.307 23.2
2027 0.286 11.8
2028 0.264 358.6
2029 0.242 342.9
2030 0.224 324.4

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

grafico orbita





wds20444%2B1945a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20444+1945 CAR 2 2001 3 317 0.2 10.29 11.60 D 204421.95+194504.1
20444+1945 CAR 2 2004 4 140 0.1 10.29 11.60 D 204421.95+194504.1
20444+1945 CAR 2 2009 6 44 0.3 10.29 11.60 204421.95+194504.1

If you need more information about this double, apply for a data request form to the WDS.