21028+4551 BU 1138 AB

 
 
21h 02m 48.62s +45° 50' 56.0" P.A. 172.00 sep 0.1 mag 7.10,7.30 Sp B3Vn dist. 400 pc (1304.8 l.y.)
 
 
Coord 2000 21028+4551 Discov num BU 1138 Comp AB Coord arcsec 2000 21 02 48.62 +45 50 56.0
Date first 1888 Date last 2006 Obs 57
Pa first 186 Pa last 171.8 P.A. Now (θ) 171.8°
Sep first 0.3 Sep last 0.075 Sep. Now (ρ) 0.075"
Mag pri 7.10 Mag sec 7.30 delta mag (ΔM) 0.2 Spectral class B3Vn (blue-white)
Pri motion ra +009 Sec motion ra
Pri motion dec +004 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
21028+4551 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 50390 21 02 49 +45 50 56 BU 1138 AB 2006 57 172 0.1 7.10 7.30 0.20 Y <===
Show HD 200595 50390 21 02 49 +45 50 56 BU 1138 AC 2012 21 330 152.1 6.46 7.82 1.36
Show 50388 21 02 41 +45 53 05 KUI 104 CD 2017 17 85 2.7 7.82 13.40 5.58
Show 50388 21 02 41 +45 53 05 BU 1138 CE 2003 8 249 23.6 7.82 12.38 4.56
Show 50388 21 02 41 +45 53 05 FYM 331 CF 2017 6 39 11.9 7.82 15.70 7.88
Show 50388 21 02 41 +45 53 05 HLA 30 CG 2016 1 148 7.3 5.40 14.30 8.90
Septuple system
7 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Cygnus SAO 50390 HIP 103871 Tycho2 3588-12113-1
Gaia DR2 2163558581037174528 HD 200595 HR 8064 GC 29403
ADS 14585 BD BD+45 3374 Distance 400 Distance ly 1304.8
 
 
ORBITAL ELEMENTS
 
 
Period (P)314.09y Periastron (T)2003.29y Semi-major axis (a)0.26a
Eccentricity (e)0.5 Inclination (i)96.4° Longitude of periastron (ω)302.8°
Node (Ω)181.7° Notesn ReferenceHrt2001b
Equinox2000 Last observation1985 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 198.9 0.047
2001 195.9 0.054
2002 193.7 0.062
2003 192.0 0.069
2004 190.5 0.077
2005 189.4 0.084
2006 188.4 0.091
2007 187.5 0.097
2008 186.8 0.104
2009 186.1 0.110
2010 185.6 0.115
2011 185.0 0.121
2012 184.5 0.126
2013 184.1 0.131
2014 183.7 0.135
2015 183.3 0.139
2016 182.9 0.143
2017 182.5 0.146
2018 182.2 0.149
2019 181.8 0.152
2020 181.5 0.155
2021 181.2 0.157
2022 180.9 0.159
2023 180.6 0.161
2024 180.3 0.162
2025 180.1 0.163
2026 179.8 0.164
2027 179.5 0.165
2028 179.2 0.165
2029 179.0 0.166
2030 178.7 0.166


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



 
 


wds21028%2B4551a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic