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Current system
21044-1951
FIN 328
Eta Cap


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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

21044-1951 FIN 328 (Eta Cap)

 
 
21h 04m 24.32s -19° 51' 17.8" P.A. 246.00 sep 0.3 mag 5.02,7.39 Sp A4V+F2V dist. 49.5 pc (161.47 l.y.)
 
 
Coord 2000 21044-1951 Discov num FIN 328 Comp Coord arcsec 2000 21 04 24.32 -19 51 17.8
Date first 1951 Date last 2023 Obs 42
Pa first 175 Pa last 245.6 P.A. Now (θ) 47.8°
Sep first 0.3 Sep last 0.293 Sep. Now (ρ) 0.26"
Mag pri 5.02 Mag sec 7.39 delta mag (ΔM) 2.37 Spectral class A4V+F2V (white/yellow-white)
Pri motion ra -033 Sec motion ra
Pri motion dec -039 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Eta Cap Constellation Capricornus SAO 189986 HIP 104019
Tycho2 6354-01492-1 Gaia DR2 6833190855089866112 HD 200499 HR 8060
GC 29419 BD BD-20 6115 Bayer Eta Capricorni Bayer name Eta Cap
Flamsteed 22 Capricorni Flamsteed name 22 Cap Distance 49.5 Distance ly 161.47
Bayer greek η Cap
 
 
ORBITAL ELEMENTS
 
 
Period (P)27.896y± 0.032 Periastron (T)2002.41y± 0.13 Semi-major axis (a)0.2639a± 0.0016
Eccentricity (e)0.4087± 0.0068 Inclination (i)163.7°± 3.4 Longitude of periastron (ω)47°± 11
Node (Ω)160.4°± 9.8 Notesn ReferenceMsn2023
Equinox Last observation Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 182.4 0.192
2001 158.2 0.170
2002 128.2 0.155
2003 94.6 0.153
2004 63.4 0.167
2005 38.6 0.191
2006 19.9 0.220
2007 5.4 0.248
2008 353.9 0.274
2009 344.2 0.296
2010 335.7 0.315
2011 328.2 0.331
2012 321.3 0.344
2013 314.8 0.353
2014 308.7 0.360
2015 302.6 0.363
2016 296.7 0.364
2017 290.7 0.362
2018 284.7 0.358
2019 278.4 0.351
2020 271.8 0.341
2021 264.8 0.329
2022 257.2 0.314
2023 248.8 0.298
2024 239.3 0.279
2025 228.4 0.258
2026 215.5 0.236
2027 199.8 0.212
2028 180.2 0.189
2029 155.4 0.168
2030 124.8 0.155
2031 91.2 0.154
2032 60.5 0.169
2033 36.4 0.194
2034 18.2 0.223
2035 4.1 0.251
2036 352.8 0.276
2037 343.2 0.298
2038 334.9 0.317
2039 327.5 0.333
2040 320.6 0.345
2041 314.2 0.354
2042 308.0 0.360
2043 302.0 0.364
2044 296.1 0.364
2045 290.1 0.362
2046 284.0 0.357
2047 277.7 0.350
2048 271.1 0.340
2049 264.1 0.328
2050 256.4 0.313


 
 grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds21044-1951d.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic