15457+5040 HU 657 (HD 234257)
15h 45m 40.74s +50° 40' 20.8" P.A. 177.00 sep 0.5 mag 10.25,10.95 Sp K0 dist. 141.44 pc (461.38 l.y.)
Coord 2000 |
15457+5040 |
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Discov num |
HU 657 |
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Comp |
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Coord arcsec 2000 |
15 45 40.74 +50 40 20.8 |
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Date first |
1904 |
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Date last |
2016 |
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Obs |
24 |
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Pa first |
123 |
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Pa last |
177.1 |
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P.A. Now (θ) |
177.1° |
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Sep first |
0.6 |
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Sep last |
0.511 |
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Sep. Now (ρ) |
0.511" |
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Mag pri |
10.25 |
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Mag sec |
10.95 |
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delta mag (ΔM) |
0.7 |
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Spectral class |
K0 (yellow-orange) |
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Pri motion ra |
-015 |
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Sec motion ra |
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Pri motion dec |
+045 |
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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 |
HD 234257 |
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Constellation |
Bootes |
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SAO |
29647 |
|
HIP |
77188 |
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Tycho2 |
3496-01461-1 |
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Gaia DR2 |
1404099236552329216 |
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HD |
234257 |
|
ADS |
9781 |
|
BD |
BD+51 2028 |
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Distance |
141.44 |
|
Distance ly |
461.38 |
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ORBITAL ELEMENTS
Period (P) | 371.5y | |
Periastron (T) | 1974.3y | |
Semi-major axis (a) | 0.581a | |
Eccentricity (e) | 0.74 | |
Inclination (i) | 123.9° | |
Longitude of periastron (ω) | 202.7° | |
Node (Ω) | 162° | |
Notes | | |
Reference | Doc2012k | |
Equinox | 2000 | |
Last observation | 2008 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
188.9 |
0.317 |
2001 |
187.7 |
0.330 |
2002 |
186.6 |
0.342 |
2003 |
185.6 |
0.353 |
2004 |
184.7 |
0.365 |
2005 |
183.8 |
0.377 |
2006 |
182.9 |
0.388 |
2007 |
182.1 |
0.399 |
2008 |
181.4 |
0.410 |
2009 |
180.7 |
0.421 |
2010 |
180.0 |
0.431 |
2011 |
179.4 |
0.442 |
2012 |
178.7 |
0.452 |
2013 |
178.1 |
0.462 |
2014 |
177.6 |
0.472 |
2015 |
177.0 |
0.482 |
2016 |
176.5 |
0.491 |
2017 |
176.0 |
0.501 |
2018 |
175.5 |
0.510 |
2019 |
175.1 |
0.519 |
2020 |
174.6 |
0.528 |
2021 |
174.2 |
0.537 |
2022 |
173.8 |
0.546 |
2023 |
173.4 |
0.555 |
2024 |
173.0 |
0.563 |
2025 |
172.6 |
0.571 |
2026 |
172.2 |
0.580 |
2027 |
171.9 |
0.588 |
2028 |
171.5 |
0.596 |
2029 |
171.2 |
0.603 |
2030 |
170.9 |
0.611 |
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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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