15559-0210 STF 1985 (HD 142661)
15h 55m 54.63s -02° 09' 51.3" P.A. 354.00 sep 6.2 mag 7.03,8.65 Sp F8V dist. 36.9 pc (120.37 l.y.)
| Coord 2000 |
15559-0210 |
|
Discov num |
STF1985 |
|
Comp |
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|
Coord arcsec 2000 |
15 55 54.63 -02 09 51.3 |
|
| Date first |
1823 |
|
Date last |
2020 |
|
Obs |
191 |
|
| Pa first |
325 |
|
Pa last |
354.4 |
|
P.A. Now (θ) |
354.4° |
|
| Sep first |
6.8 |
|
Sep last |
6.15 |
|
Sep. Now (ρ) |
6.15" |
|
| Mag pri |
7.03 |
|
Mag sec |
8.65 |
|
delta mag (ΔM) |
1.62 |
|
Spectral class |
F8V (yellow-white) |
|
| Pri motion ra |
-089 |
|
Sec motion ra |
-089 |
|
| Pri motion dec |
-061 |
|
Sec motion dec |
-061 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 142661 |
|
Constellation |
Serpens |
|
SAO |
140842 |
|
HIP |
78024 |
|
| Tycho2 |
5023-00606-1 |
|
Gaia DR2 |
4409032079673958528 |
|
HD |
142661 |
|
GC |
21389 |
|
| ADS |
9842 |
|
BD |
BD-01 3118 |
|
Distance |
36.9 |
|
Distance ly |
120.37 |
|
ORBITAL ELEMENTS
| Period (P) | 2307.2358y | ± 1063.2839 |
Periastron (T) | 1650.0128y | ± 223.5323 |
Semi-major axis (a) | 12.59388a | ± 6.03082 |
| Eccentricity (e) | 0.7909 | ± 0.15064 |
Inclination (i) | 68.192° | ± 10.417 |
Longitude of periastron (ω) | 109.886° | ± 22.101 |
| Node (Ω) | 112.512° | ± 43.18 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2015 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
351.7 |
5.998 |
| 2001 |
351.9 |
6.000 |
| 2002 |
352.0 |
6.002 |
| 2003 |
352.2 |
6.004 |
| 2004 |
352.4 |
6.006 |
| 2005 |
352.5 |
6.008 |
| 2006 |
352.7 |
6.011 |
| 2007 |
352.8 |
6.013 |
| 2008 |
353.0 |
6.015 |
| 2009 |
353.1 |
6.017 |
| 2010 |
353.3 |
6.019 |
| 2011 |
353.4 |
6.021 |
| 2012 |
353.6 |
6.023 |
| 2013 |
353.8 |
6.026 |
| 2014 |
353.9 |
6.028 |
| 2015 |
354.1 |
6.030 |
| 2016 |
354.2 |
6.032 |
| 2017 |
354.4 |
6.034 |
| 2018 |
354.5 |
6.037 |
| 2019 |
354.7 |
6.039 |
| 2020 |
354.8 |
6.041 |
| 2021 |
355.0 |
6.044 |
| 2022 |
355.1 |
6.046 |
| 2023 |
355.3 |
6.048 |
| 2024 |
355.5 |
6.051 |
| 2025 |
355.6 |
6.053 |
| 2026 |
355.8 |
6.055 |
| 2027 |
355.9 |
6.058 |
| 2028 |
356.1 |
6.060 |
| 2029 |
356.2 |
6.063 |
| 2030 |
356.4 |
6.065 |
|
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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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