17166-0027 A 2984 (41 Oph)

 
 
17h 16m 36.69s -00° 26' 43.1" P.A. 27.00 sep 0.7 mag 4.92,7.51 Sp K1IV dist. 63.09 pc (205.8 l.y.)
 
 
Coord 2000 17166-0027 Discov num A  2984 Comp Coord arcsec 2000 17 16 36.69 -00 26 43.1
Date first 1915 Date last 2021 Obs 94
Pa first 298 Pa last 26.7 P.A. Now (θ) 26.7°
Sep first 0.5 Sep last 0.677 Sep. Now (ρ) 0.677"
Mag pri 4.92 Mag sec 7.51 delta mag (ΔM) 2.59 Spectral class K1IV (yellow-orange)
Pri motion ra -031 Sec motion ra -031
Pri motion dec -073 Sec motion dec -073
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 41 Oph Constellation Ophiuchus SAO 141586 HIP 84514
Tycho2 5066-01267-1 HD 156266 HR 6415 GC 23320
ADS 10429 BD BD-00 3255 Flamsteed 41 Ophiuchi Flamsteed name 41 Oph
Distance 63.09 Distance ly 205.8
 
 
ORBITAL ELEMENTS
 
 
Period (P)160.1y± 14.5 Periastron (T)1893.2y± 8.7 Semi-major axis (a)0.648a± 0.05
Eccentricity (e)0.567± 0.115 Inclination (i)36.7°± 12.4 Longitude of periastron (ω)356°± 9.7
Node (Ω)172.1°± 6.5 Notesn ReferenceTok2024e
Equinox2000 Last observation2024 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 6.2 0.917
2001 6.9 0.909
2002 7.7 0.900
2003 8.5 0.892
2004 9.3 0.883
2005 10.1 0.874
2006 10.9 0.864
2007 11.7 0.854
2008 12.6 0.844
2009 13.5 0.833
2010 14.4 0.822
2011 15.3 0.811
2012 16.3 0.800
2013 17.3 0.788
2014 18.3 0.775
2015 19.4 0.763
2016 20.5 0.750
2017 21.6 0.736
2018 22.8 0.723
2019 24.0 0.709
2020 25.2 0.694
2021 26.6 0.680
2022 27.9 0.665
2023 29.4 0.649
2024 30.9 0.634
2025 32.5 0.618
2026 34.2 0.602
2027 35.9 0.585
2028 37.8 0.568
2029 39.8 0.551
2030 41.9 0.534
2031 44.2 0.516
2032 46.6 0.499
2033 49.2 0.481
2034 52.0 0.463
2035 55.0 0.446
2036 58.3 0.428
2037 61.8 0.411
2038 65.7 0.394
2039 69.9 0.377
2040 74.5 0.361
2041 79.5 0.346
2042 84.9 0.332
2043 90.8 0.319
2044 97.1 0.308
2045 103.9 0.299
2046 111.1 0.291
2047 118.6 0.285
2048 126.4 0.281
2049 134.4 0.279
2050 142.4 0.278


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds17166-0027c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic