00284-2020 B  1909

 
 
00h 28m 21.17s -20 20' 05.2" P.A. 248.7 sep 0.09 mag 7.23,7.40 Sp G0V dist. 32.2 pc (105.04 l.y.)
 
 
Coord 2000
00284-2020
Discov num
B  1909
Comp
Coord arcsec 2000
00 28 21.17 -20 20 05.2
Date first
1929
Date last
2015
Obs
88
Pa first
119
Pa last
137
P.A. Now (θ)
248.7°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.09"
Mag pri
7.23
Mag sec
7.40
delta mag (ΔM)
0.17
Spectral class
G0V (yellow)
Pri motion ra
-116
Sec motion ra
Pri motion dec
-114
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
137.2
Precise sep
0.156
Cdsa2 id
B 1909
Constellation
Cetus
SAO
166296
HIP
2237
Tycho2
5846-00959-1
HD
2475
HR
108
BD
BD-21 57
Ra deg
0.47254722222222223
De deg
-20.334777777777777
Distance
32.2
Distance ly
105.04
last precise pa
137.2
last precise sep
0.156
 
 
ORBITAL ELEMENTS
 
 
Period (P)11.35y Periastron (T)1995.09y Semi-major axis (a)0.202a
Eccentricity (e)0.005 Inclination (i)69.8° Longitude of periastron (ω)99°
Node (Ω)119.49° Note Grade1(1=Definitive, 9=Indet.)
Equinox2000 Last observation2009
label rho theta
2000 0.086 351.6
2001 0.088 69.9
2002 0.157 102.1
2003 0.199 115.8
2004 0.190 127.1
2005 0.133 144.0
2006 0.071 195.0
2007 0.110 265.3
2008 0.176 287.7
2009 0.202 299.8
2010 0.175 311.9
2011 0.109 334.7
2012 0.072 44.8
2013 0.134 94.7
2014 0.190 111.7
2015 0.199 123.0
2016 0.157 136.6
2017 0.087 169.2
2018 0.086 248.7
2019 0.156 282.1
2020 0.199 295.9
2021 0.190 307.2
2022 0.134 324.1
2023 0.073 13.6
2024 0.109 84.0
2025 0.175 107.0
2026 0.202 119.1
2027 0.177 131.0
2028 0.111 153.0
2029 0.071 222.4
2030 0.132 274.5

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

grafico orbita





wds00284-2020a.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
00284-2020 B 1909 1999 71 156 0.1 7.23 7.40 G0V NOD 002821.17-202005.2
00284-2020 B 1909 2008 77 297 0.2 7.23 7.40 G0V NOD 002821.17-202005.2
00284-2020 B 1909 2010 80 337 0.1 7.23 7.40 G0V NOD 002821.17-202005.2
00284-2020 B 1909 2014 83 301 0.2 7.23 7.40 G0V NO 002821.17-202005.2
00284-2020 B 1909 2015 84 137 0.2 7.23 7.40 G0V NO 002821.17-202005.2

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