03307-1926 HDS 441 (HD 21841)
03h 30m 40.06s -19° 26' 08.0" P.A. 34.00 sep 0.2 mag 8.22,8.47 Sp G5V dist. 44.4 pc (144.83 l.y.)
Coord 2000 |
03307-1926 |
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Discov num |
HDS 441 |
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Comp |
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Coord arcsec 2000 |
03 30 40.06 -19 26 08.0 |
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Date first |
1991 |
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Date last |
2021 |
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Obs |
25 |
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Pa first |
195 |
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Pa last |
33.5 |
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P.A. Now (θ) |
26.8° |
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Sep first |
0.2 |
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Sep last |
0.156 |
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Sep. Now (ρ) |
0.179" |
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Mag pri |
8.22 |
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Mag sec |
8.47 |
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delta mag (ΔM) |
0.25 |
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Spectral class |
G5V (yellow) |
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Pri motion ra |
+000 |
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Sec motion ra |
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Pri motion dec |
-007 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 21841 |
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Constellation |
Eridanus |
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SAO |
149001 |
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HIP |
16348 |
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Tycho2 |
5876-00918-1 |
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Gaia DR2 |
5101676365959144832 |
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HD |
21841 |
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BD |
BD-19 694 |
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Distance |
44.4 |
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Distance ly |
144.83 |
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ORBITAL ELEMENTS
Period (P) | 18.964y | ± 0.125 |
Periastron (T) | 2007.281y | ± 0.149 |
Semi-major axis (a) | 0.2181a | ± 0.0097 |
Eccentricity (e) | 0.5 | ± 0.059 |
Inclination (i) | 102.7° | ± 1.1 |
Longitude of periastron (ω) | 84.4° | ± 9.8 |
Node (Ω) | 17.8° | ± 0.9 |
Notes | | |
Reference | Cve2016b | |
Equinox | 2000 | |
Last observation | 2014 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
66.5 |
0.090 |
2001 |
50.1 |
0.117 |
2002 |
39.8 |
0.144 |
2003 |
32.7 |
0.167 |
2004 |
27.0 |
0.179 |
2005 |
21.6 |
0.174 |
2006 |
14.7 |
0.136 |
2007 |
351.4 |
0.050 |
2008 |
213.2 |
0.078 |
2009 |
199.9 |
0.156 |
2010 |
194.4 |
0.192 |
2011 |
190.0 |
0.201 |
2012 |
185.7 |
0.194 |
2013 |
180.7 |
0.175 |
2014 |
174.2 |
0.150 |
2015 |
164.8 |
0.122 |
2016 |
149.8 |
0.094 |
2017 |
124.9 |
0.075 |
2018 |
92.2 |
0.074 |
2019 |
65.8 |
0.091 |
2020 |
49.6 |
0.118 |
2021 |
39.5 |
0.145 |
2022 |
32.5 |
0.167 |
2023 |
26.8 |
0.179 |
2024 |
21.4 |
0.173 |
2025 |
14.3 |
0.134 |
2026 |
348.7 |
0.046 |
2027 |
212.2 |
0.081 |
2028 |
199.7 |
0.158 |
2029 |
194.2 |
0.193 |
2030 |
189.9 |
0.201 |
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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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