15542+1659 A 2080 (HD 142455)
15h 54m 10.28s +16° 59' 28.0" P.A. 104.00 sep 0.4 mag 8.83,9.20 Sp F2 dist. 132.98 pc (433.78 l.y.)
Coord 2000 |
15542+1659 |
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Discov num |
A 2080 |
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Comp |
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Coord arcsec 2000 |
15 54 10.28 +16 59 28.0 |
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Date first |
1909 |
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Date last |
2016 |
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Obs |
84 |
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Pa first |
317 |
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Pa last |
103.6 |
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P.A. Now (θ) |
103.6° |
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Sep first |
0.2 |
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Sep last |
0.384 |
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Sep. Now (ρ) |
0.384" |
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Mag pri |
8.83 |
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Mag sec |
9.20 |
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delta mag (ΔM) |
0.37 |
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Spectral class |
F2 (yellow-white) |
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Pri motion ra |
+011 |
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Sec motion ra |
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Pri motion dec |
+001 |
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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 142455 |
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Constellation |
Serpens |
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SAO |
101804 |
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HIP |
77875 |
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Tycho2 |
1496-00733-1 |
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HD |
142455 |
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ADS |
9831 |
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BD |
BD+17 2929 |
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Distance |
132.98 |
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Distance ly |
433.78 |
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ORBITAL ELEMENTS
Period (P) | 382.99y | ± 292.64 |
Periastron (T) | 2285.17y | ± 443.01 |
Semi-major axis (a) | 0.369a | ± 0.137 |
Eccentricity (e) | 0.157 | ± 0.083 |
Inclination (i) | 62.9° | ± 4.5 |
Longitude of periastron (ω) | 40.7° | ± 217.2 |
Node (Ω) | 294° | ± 12.3 |
Notes | n | |
Reference | Hrt2008 | |
Equinox | 2000 | |
Last observation | 2004 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
99.4 |
0.341 |
2001 |
99.9 |
0.344 |
2002 |
100.4 |
0.347 |
2003 |
100.8 |
0.350 |
2004 |
101.3 |
0.352 |
2005 |
101.8 |
0.355 |
2006 |
102.2 |
0.358 |
2007 |
102.7 |
0.360 |
2008 |
103.1 |
0.363 |
2009 |
103.5 |
0.365 |
2010 |
104.0 |
0.368 |
2011 |
104.4 |
0.370 |
2012 |
104.8 |
0.373 |
2013 |
105.2 |
0.375 |
2014 |
105.6 |
0.377 |
2015 |
106.0 |
0.379 |
2016 |
106.4 |
0.381 |
2017 |
106.8 |
0.383 |
2018 |
107.2 |
0.385 |
2019 |
107.6 |
0.387 |
2020 |
108.0 |
0.389 |
2021 |
108.4 |
0.390 |
2022 |
108.7 |
0.392 |
2023 |
109.1 |
0.394 |
2024 |
109.5 |
0.395 |
2025 |
109.9 |
0.397 |
2026 |
110.2 |
0.398 |
2027 |
110.6 |
0.399 |
2028 |
110.9 |
0.401 |
2029 |
111.3 |
0.402 |
2030 |
111.7 |
0.403 |
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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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