20423+5723 BU 152 (HD 197618)
20h 42m 16.81s +57° 23' 07.4" P.A. 82.00 sep 1.2 mag 7.21,8.80 Sp A4IV dist. 152.44 pc (497.26 l.y.)
| Coord 2000 |
20423+5723 |
|
Discov num |
BU 152 |
|
Comp |
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|
Coord arcsec 2000 |
20 42 16.81 +57 23 07.4 |
|
| Date first |
1873 |
|
Date last |
2016 |
|
Obs |
63 |
|
| Pa first |
130 |
|
Pa last |
82.2 |
|
P.A. Now (θ) |
82.2° |
|
| Sep first |
0.4 |
|
Sep last |
1.233 |
|
Sep. Now (ρ) |
1.233" |
|
| Mag pri |
7.21 |
|
Mag sec |
8.80 |
|
delta mag (ΔM) |
1.59 |
|
Spectral class |
A4IV (white) |
|
| Pri motion ra |
-006 |
|
Sec motion ra |
-006 |
|
| Pri motion dec |
+005 |
|
Sec motion dec |
+005 |
|
| Notes |
O
(Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Name |
HD 197618 |
|
Constellation |
Cepheus |
|
SAO |
32812 |
|
HIP |
102183 |
|
| Tycho2 |
3959-01153-1 |
|
Gaia DR2 |
2187250513975684224 |
|
HD |
197618 |
|
GC |
28872 |
|
| ADS |
14196 |
|
BD |
BD+56 2474 |
|
Distance |
152.44 |
|
Distance ly |
497.26 |
|
ORBITAL ELEMENTS
| Period (P) | 737.3089y | ± 353.7497 |
Periastron (T) | 1811.6742y | ± 81.8172 |
Semi-major axis (a) | 1.02596a | ± 0.34006 |
| Eccentricity (e) | 0.32296 | ± 0.42968 |
Inclination (i) | 109.39° | ± 9.086 |
Longitude of periastron (ω) | 234.888° | ± 90.989 |
| Node (Ω) | 84.418° | ± 10.233 |
Notes | | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2015 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
84.0 |
1.136 |
| 2001 |
83.9 |
1.138 |
| 2002 |
83.8 |
1.140 |
| 2003 |
83.7 |
1.142 |
| 2004 |
83.5 |
1.144 |
| 2005 |
83.4 |
1.146 |
| 2006 |
83.3 |
1.148 |
| 2007 |
83.2 |
1.150 |
| 2008 |
83.0 |
1.152 |
| 2009 |
82.9 |
1.154 |
| 2010 |
82.8 |
1.156 |
| 2011 |
82.7 |
1.158 |
| 2012 |
82.6 |
1.159 |
| 2013 |
82.4 |
1.161 |
| 2014 |
82.3 |
1.162 |
| 2015 |
82.2 |
1.164 |
| 2016 |
82.1 |
1.165 |
| 2017 |
82.0 |
1.167 |
| 2018 |
81.8 |
1.168 |
| 2019 |
81.7 |
1.169 |
| 2020 |
81.6 |
1.170 |
| 2021 |
81.5 |
1.172 |
| 2022 |
81.4 |
1.173 |
| 2023 |
81.3 |
1.174 |
| 2024 |
81.1 |
1.175 |
| 2025 |
81.0 |
1.176 |
| 2026 |
80.9 |
1.177 |
| 2027 |
80.8 |
1.178 |
| 2028 |
80.7 |
1.179 |
| 2029 |
80.6 |
1.179 |
| 2030 |
80.4 |
1.180 |
|
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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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