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Current system
17220-2500
CHR 182
The Oph


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Neglected List I
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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

17220-2500 CHR 182 (The Oph)

 
 
17h 22m 00.58s -24° 59' 58.2" P.A. 55.00 sep 0.2 mag 3.40,6.20 Sp B2IV dist. 133.69 pc (436.1 l.y.)
 
 
Coord 2000 17220-2500 Discov num CHR 182 Comp Coord arcsec 2000 17 22 00.58 -24 59 58.2
Date first 1992 Date last 2023 Obs 12
Pa first 234 Pa last 55.1 P.A. Now (θ) 218.5°
Sep first 0.2 Sep last 0.169 Sep. Now (ρ) 0.008"
Mag pri 3.40 Mag sec 6.20 delta mag (ΔM) 2.8 Spectral class B2IV (blue-white)
Pri motion ra -004 Sec motion ra
Pri motion dec -020 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name The Oph Constellation Ophiuchus SAO 185320 HIP 84970
Tycho2 6829-00577-1 Gaia DR2 4110730486344995456 HD 157056 HR 6453
GC 23451 CD CD-2413292 CP CP-24 5876 Bayer Theta Ophiuchi
Bayer name The Oph Flamsteed 42 Ophiuchi Flamsteed name 42 Oph FK5 644
Distance 133.69 Distance ly 436.1 Bayer greek θ Oph
 
 
ORBITAL ELEMENTS
 
 
Period (P)28.21y Periastron (T)1995.29y Semi-major axis (a)0.229a
Eccentricity (e)0.4 Inclination (i)89.2° Longitude of periastron (ω)47°
Node (Ω)54.4° Notes ReferenceTok2021f
Equinox Last observation2021 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 234.0 0.195
2001 234.2 0.231
2002 234.3 0.256
2003 234.5 0.272
2004 234.6 0.280
2005 234.7 0.281
2006 234.8 0.276
2007 234.9 0.265
2008 235.0 0.249
2009 235.2 0.228
2010 235.4 0.203
2011 235.6 0.175
2012 236.0 0.143
2013 236.5 0.108
2014 237.6 0.072
2015 241.2 0.033
2016 22.6 0.007
2017 50.0 0.045
2018 52.3 0.082
2019 53.2 0.116
2020 53.7 0.142
2021 54.1 0.156
2022 54.4 0.150
2023 54.9 0.119
2024 56.0 0.063
2025 218.5 0.008
2026 232.8 0.077
2027 233.6 0.137
2028 234.0 0.187
2029 234.2 0.224
2030 234.3 0.251
2031 234.4 0.269
2032 234.6 0.279
2033 234.7 0.281
2034 234.8 0.277
2035 234.9 0.268
2036 235.0 0.252
2037 235.2 0.233
2038 235.3 0.209
2039 235.6 0.181
2040 235.9 0.150
2041 236.4 0.116
2042 237.3 0.080
2043 239.9 0.042
2044 294.5 0.004
2045 48.9 0.037
2046 52.0 0.075
2047 53.0 0.109
2048 53.6 0.137
2049 54.0 0.154
2050 54.3 0.153


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds17220-2500a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic