03363-1728 HDS 456 (20 Eri)
03h 36m 17.39s -17° 28' 01.3" P.A. 100.00 sep 0.1 mag 5.48,6.84 Sp B8/B9III dist. 149.25 pc (486.85 l.y.)
Coord 2000 |
03363-1728 |
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Discov num |
HDS 456 |
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Comp |
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Coord arcsec 2000 |
03 36 17.39 -17 28 01.3 |
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Date first |
1991 |
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Date last |
2020 |
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Obs |
20 |
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Pa first |
65 |
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Pa last |
99.5 |
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P.A. Now (θ) |
92.6° |
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Sep first |
0.2 |
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Sep last |
0.113 |
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Sep. Now (ρ) |
0.158" |
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Mag pri |
5.48 |
|
Mag sec |
6.84 |
|
delta mag (ΔM) |
1.36 |
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Spectral class |
B8/B9III (blue-white) |
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Pri motion ra |
+033 |
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Sec motion ra |
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Pri motion dec |
-010 |
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Sec motion dec |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
20 Eri |
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Var name |
EG Eri |
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Constellation |
Eridanus |
|
SAO |
149063 |
|
HIP |
16803 |
|
Tycho2 |
5874-01098-1 |
|
Gaia DR2 |
5108493960822714752 |
|
HD |
22470 |
|
HR |
1100 |
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GC |
4305 |
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BD |
BD-17 699 |
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Flamsteed |
20 Eridani |
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Flamsteed name |
20 Eri |
|
FK5 |
1100 |
|
Distance |
149.25 |
|
Distance ly |
486.85 |
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ORBITAL ELEMENTS
Period (P) | 21y | ± 0.27 |
Periastron (T) | 2018.05y | ± 0.08 |
Semi-major axis (a) | 0.107a | ± 0.003 |
Eccentricity (e) | 0.841 | ± 0.008 |
Inclination (i) | 134.3° | ± 2.4 |
Longitude of periastron (ω) | 197.9° | ± 8.2 |
Node (Ω) | 92.8° | ± 5.9 |
Notes | | |
Reference | Tok2019c | |
Equinox | | |
Last observation | 2018 | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
100.3 |
0.119 |
2001 |
95.9 |
0.141 |
2002 |
92.6 |
0.158 |
2003 |
89.8 |
0.171 |
2004 |
87.4 |
0.181 |
2005 |
85.3 |
0.187 |
2006 |
83.2 |
0.191 |
2007 |
81.2 |
0.193 |
2008 |
79.2 |
0.191 |
2009 |
77.1 |
0.187 |
2010 |
74.9 |
0.181 |
2011 |
72.6 |
0.172 |
2012 |
69.9 |
0.160 |
2013 |
66.7 |
0.145 |
2014 |
62.7 |
0.127 |
2015 |
57.2 |
0.105 |
2016 |
48.2 |
0.078 |
2017 |
27.4 |
0.045 |
2018 |
272.9 |
0.017 |
2019 |
122.7 |
0.051 |
2020 |
107.1 |
0.090 |
2021 |
100.3 |
0.119 |
2022 |
95.9 |
0.141 |
2023 |
92.6 |
0.158 |
2024 |
89.8 |
0.171 |
2025 |
87.4 |
0.181 |
2026 |
85.3 |
0.187 |
2027 |
83.2 |
0.191 |
2028 |
81.2 |
0.193 |
2029 |
79.2 |
0.191 |
2030 |
77.1 |
0.187 |
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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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