20312+0513 AG 257 (MR Del)
20h 31m 13.51s +05° 13' 08.7" P.A. 75.00 sep 1.7 mag 9.49,9.77 Sp K0 dist. 48.54 pc (158.34 l.y.)
| Coord 2000 |
20312+0513 |
|
Discov num |
AG 257 |
|
Comp |
|
|
Coord arcsec 2000 |
20 31 13.51 +05 13 08.7 |
|
| Date first |
1902 |
|
Date last |
2016 |
|
Obs |
46 |
|
| Pa first |
55 |
|
Pa last |
75 |
|
P.A. Now (θ) |
75° |
|
| Sep first |
1.6 |
|
Sep last |
1.687 |
|
Sep. Now (ρ) |
1.687" |
|
| Mag pri |
9.49 |
|
Mag sec |
9.77 |
|
delta mag (ΔM) |
0.28 |
|
Spectral class |
K0 (yellow-orange) |
|
| Pri motion ra |
+303 |
|
Sec motion ra |
+303 |
|
| Pri motion dec |
+275 |
|
Sec motion dec |
+275 |
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
OTHER CATALOGS AND DESIGNATIONS
| Var name |
MR Del |
|
Constellation |
Delphinus |
|
SAO |
125889 |
|
HIP |
101236 |
|
| Tycho2 |
0518-01755-1 |
|
Gaia DR2 |
4245659976226458752 |
|
HD |
195434 |
|
GC |
28539 |
|
| BD |
BD+04 4470 |
|
Distance |
48.54 |
|
Distance ly |
158.34 |
|
ORBITAL ELEMENTS
| Period (P) | 676.2405y | ± 293.8216 |
Periastron (T) | 1836.3877y | ± 38.3978 |
Semi-major axis (a) | 2.50711a | ± 1.08477 |
| Eccentricity (e) | 0.62797 | ± 0.28087 |
Inclination (i) | 75.379° | ± 8.433 |
Longitude of periastron (ω) | 272.461° | ± 20.931 |
| Node (Ω) | 46.399° | ± 9.075 |
Notes | n | |
Reference | Izm2019 | |
| Equinox | | |
Last observation | 2015 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
70.7 |
1.746 |
| 2001 |
70.9 |
1.741 |
| 2002 |
71.1 |
1.736 |
| 2003 |
71.4 |
1.731 |
| 2004 |
71.6 |
1.725 |
| 2005 |
71.8 |
1.720 |
| 2006 |
72.0 |
1.715 |
| 2007 |
72.3 |
1.709 |
| 2008 |
72.5 |
1.704 |
| 2009 |
72.7 |
1.698 |
| 2010 |
72.9 |
1.693 |
| 2011 |
73.2 |
1.687 |
| 2012 |
73.4 |
1.682 |
| 2013 |
73.6 |
1.676 |
| 2014 |
73.9 |
1.671 |
| 2015 |
74.1 |
1.665 |
| 2016 |
74.3 |
1.660 |
| 2017 |
74.6 |
1.654 |
| 2018 |
74.8 |
1.648 |
| 2019 |
75.1 |
1.642 |
| 2020 |
75.3 |
1.637 |
| 2021 |
75.6 |
1.631 |
| 2022 |
75.8 |
1.625 |
| 2023 |
76.1 |
1.619 |
| 2024 |
76.3 |
1.613 |
| 2025 |
76.6 |
1.607 |
| 2026 |
76.8 |
1.602 |
| 2027 |
77.1 |
1.596 |
| 2028 |
77.3 |
1.590 |
| 2029 |
77.6 |
1.584 |
| 2030 |
77.9 |
1.578 |
|
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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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