18437+3141 A 253
18h 43m 43.55s +31° 40' 54.1" P.A. 132.00 sep 0.7 mag 9.71,10.29 Sp K0 dist. 47.62 pc (155.34 l.y.)
Coord 2000 |
18437+3141 |
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Discov num |
A 253 |
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Comp |
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Coord arcsec 2000 |
18 43 43.55 +31 40 54.1 |
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Date first |
1901 |
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Date last |
2016 |
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Obs |
73 |
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Pa first |
129 |
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Pa last |
132.4 |
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P.A. Now (θ) |
132.4° |
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Sep first |
0.8 |
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Sep last |
0.69 |
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Sep. Now (ρ) |
0.69" |
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Mag pri |
9.71 |
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Mag sec |
10.29 |
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delta mag (ΔM) |
0.58 |
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Spectral class |
K0 (yellow-orange) |
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Pri motion ra |
-043 |
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Sec motion ra |
-043 |
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Pri motion dec |
-041 |
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Sec motion dec |
-041 |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Constellation |
Lyra |
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HIP |
91868 |
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Tycho2 |
2637-00358-1 |
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Gaia DR2 |
2090020902595370240 |
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ADS |
11623 |
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BD |
BD+31 3347 |
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Distance |
47.62 |
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Distance ly |
155.34 |
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ORBITAL ELEMENTS
Period (P) | 98.57y | |
Periastron (T) | 1942.28y | |
Semi-major axis (a) | 0.47a | |
Eccentricity (e) | 0.78 | |
Inclination (i) | 57.5° | |
Longitude of periastron (ω) | 12° | |
Node (Ω) | 297.5° | |
Notes | n | |
Reference | Baz1987d | |
Equinox | | |
Last observation | 1983 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
127.5 |
0.791 |
2001 |
127.9 |
0.784 |
2002 |
128.4 |
0.777 |
2003 |
128.8 |
0.770 |
2004 |
129.3 |
0.762 |
2005 |
129.8 |
0.753 |
2006 |
130.3 |
0.743 |
2007 |
130.8 |
0.733 |
2008 |
131.3 |
0.723 |
2009 |
131.8 |
0.712 |
2010 |
132.3 |
0.700 |
2011 |
132.9 |
0.688 |
2012 |
133.5 |
0.675 |
2013 |
134.1 |
0.661 |
2014 |
134.7 |
0.647 |
2015 |
135.4 |
0.632 |
2016 |
136.1 |
0.616 |
2017 |
136.8 |
0.600 |
2018 |
137.6 |
0.582 |
2019 |
138.4 |
0.565 |
2020 |
139.3 |
0.546 |
2021 |
140.2 |
0.527 |
2022 |
141.3 |
0.507 |
2023 |
142.4 |
0.486 |
2024 |
143.6 |
0.464 |
2025 |
144.9 |
0.441 |
2026 |
146.4 |
0.417 |
2027 |
148.0 |
0.393 |
2028 |
149.9 |
0.368 |
2029 |
152.1 |
0.341 |
2030 |
154.6 |
0.314 |
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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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