21441+2845 STF 2822 AB (Mu1 Cyg)

 
 
21h 44m 08.57s +28 44' 33.4" P.A. 325.00 sep 1.6 mag 4.75,6.18 Sp F6V+G2V dist. 22.24 pc (72.55 l.y.)
 
 
Coord 2000 21441+2845 Discov num STF2822 Comp AB Coord arcsec 2000 21 44 08.57 +28 44 33.4
Date first 1777 Date last 2020 Obs 735
Pa first 108 Pa last 324.9 P.A. Now (θ) 325.5°
Sep first 11.0 Sep last 1.59 Sep. Now (ρ) 1.472"
Mag pri 4.75 Mag sec 6.18 delta mag (ΔM) 1.43 Spectral class F6V+G2V (yellow-white/yellow)
Pri motion ra +260 Sec motion ra +260
Pri motion dec -243 Sec motion dec -243
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
21441+2845 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Mu1 Cyg 89940 21 44 09 +28 44 33 STF 2822 AB 2020 735 325 1.6 4.75 6.18 1.43 Y <===
Show 89940 21 44 09 +28 44 33 STF 2822 AC 2012 16 292 76.6 4.75 12.93 8.18
Show 89940 21 44 09 +28 44 33 STF 2822 AD 2019 56 43 197.0 4.75 6.94 2.19
Show 89940 21 44 09 +28 44 33 FYM 25 AF 2012 3 72 111.5 4.75 12.64 7.89
Show 89940 21 44 09 +28 44 33 FYM 25 AG 2012 3 73 168.1 4.75 13.77 9.02
Show 89944 21 44 08 +28 44 35 STF 2822 BD 2012 24 45 196.7 6.18 6.94 0.76
Show 89944 21 44 19 +28 46 54 ES 521 DE 2015 7 286 17.5 6.94 13.13 6.19
Show 89944 21 44 19 +28 46 54 FYM 25 DG 2012 3 164 89.6 6.94 13.77 6.83
Septuple system
7 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Mu1 Cyg Constellation Cygnus SAO 89940 HIP 107310
Tycho2 2201-02078-1 HD 206826 HR 8309 GC 30438
ADS 15270 GL Gl 836.6A BD BD+28 4169 Bayer Mu 1 Cygni
Bayer name Mu1 Cyg Flamsteed 78 Cygni Flamsteed name 78 Cyg Distance 22.24
Distance ly 72.55 Bayer greek μ1 Cyg
 
 
ORBITAL ELEMENTS
 
 
Period (P)692.0588y± 94.1386 Periastron (T)1958.2452y± 0.836 Semi-major axis (a)4.65541a± 0.43627
Eccentricity (e)0.61798± 0.04089 Inclination (i)75.219°± 0.366 Longitude of periastron (ω)143.214°± 1.759
Node (Ω)110.96°± 0.411 Notesn ReferenceIzm2019
Equinox Last observation2015 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 306.9 1.891
2001 307.6 1.876
2002 308.2 1.860
2003 308.9 1.844
2004 309.5 1.827
2005 310.2 1.810
2006 310.9 1.792
2007 311.6 1.775
2008 312.4 1.756
2009 313.1 1.738
2010 313.9 1.720
2011 314.6 1.701
2012 315.4 1.682
2013 316.2 1.663
2014 317.1 1.644
2015 317.9 1.625
2016 318.8 1.605
2017 319.7 1.586
2018 320.6 1.567
2019 321.5 1.548
2020 322.5 1.529
2021 323.4 1.510
2022 324.4 1.491
2023 325.5 1.472
2024 326.5 1.453
2025 327.6 1.435
2026 328.7 1.417
2027 329.9 1.400
2028 331.0 1.382
2029 332.2 1.365
2030 333.5 1.348


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



 
 


wds21441%2B2845b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic