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 Notesn ReferenceIzm2019
Equinox Last observation2015 Grade5(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


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.



 
 


wds20312%2B0513b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic