17577-2143 HDS 2530
17h 57m 40.96s -21° 43' 09.5" P.A. 179.00 sep 0.6 mag 10.21,12.68 Sp K3/K4V dist. 31.81 pc (103.76 l.y.)
Coord 2000 |
17577-2143 |
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Discov num |
HDS2530 |
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Comp |
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Coord arcsec 2000 |
17 57 40.96 -21 43 09.5 |
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Date first |
1991 |
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Date last |
2019 |
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Obs |
8 |
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Pa first |
297 |
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Pa last |
179.4 |
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P.A. Now (θ) |
179.4° |
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Sep first |
0.4 |
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Sep last |
0.558 |
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Sep. Now (ρ) |
0.558" |
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Mag pri |
10.21 |
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Mag sec |
12.68 |
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delta mag (ΔM) |
2.47 |
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Spectral class |
K3/K4V (yellow-orange) |
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Pri motion ra |
+024 |
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Sec motion ra |
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Pri motion dec |
-162 |
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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
Constellation |
Sagittarius |
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HIP |
87925 |
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Tycho2 |
6262-00252-3 |
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Gaia DR2 |
4070388266455534720 |
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HD |
163573 |
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BD |
BD-21 4791 |
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Distance |
31.81 |
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Distance ly |
103.76 |
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ORBITAL ELEMENTS
Period (P) | 59.9y | ± 2.1 |
Periastron (T) | 1998.25y | ± 0.56 |
Semi-major axis (a) | 0.514a | ± 0.013 |
Eccentricity (e) | 0.608 | ± 0.019 |
Inclination (i) | 58.9° | ± 1.6 |
Longitude of periastron (ω) | 250.9° | ± 2.3 |
Node (Ω) | 143.7° | ± 2.6 |
Notes | | |
Reference | Tok2019c | |
Equinox | | |
Last observation | 2018 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
102.1 |
0.156 |
2001 |
120.7 |
0.225 |
2002 |
130.7 |
0.288 |
2003 |
137.3 |
0.343 |
2004 |
142.1 |
0.389 |
2005 |
146.0 |
0.427 |
2006 |
149.3 |
0.459 |
2007 |
152.3 |
0.485 |
2008 |
154.9 |
0.507 |
2009 |
157.3 |
0.524 |
2010 |
159.7 |
0.538 |
2011 |
161.9 |
0.549 |
2012 |
164.0 |
0.557 |
2013 |
166.1 |
0.563 |
2014 |
168.1 |
0.567 |
2015 |
170.1 |
0.569 |
2016 |
172.1 |
0.569 |
2017 |
174.1 |
0.568 |
2018 |
176.2 |
0.565 |
2019 |
178.2 |
0.561 |
2020 |
180.3 |
0.556 |
2021 |
182.4 |
0.549 |
2022 |
184.6 |
0.542 |
2023 |
186.9 |
0.535 |
2024 |
189.2 |
0.526 |
2025 |
191.6 |
0.517 |
2026 |
194.1 |
0.508 |
2027 |
196.6 |
0.498 |
2028 |
199.3 |
0.488 |
2029 |
202.1 |
0.477 |
2030 |
205.0 |
0.467 |
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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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