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Current system
20375+1436
BU 151 AB
Rotanev


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

20375+1436 BU 151 AB (Rotanev)

 
 
20h 37m 32.87s +14° 35' 42.7" P.A. 218.00 sep 0.2 mag 4.11,5.02 Sp F5IV+F2V dist. 30.93 pc (100.89 l.y.)
 
 
Coord 2000 20375+1436 Discov num BU  151 Comp AB Coord arcsec 2000 20 37 32.87 +14 35 42.7
Date first 1873 Date last 2018 Obs 734
Pa first 355 Pa last 217.9 P.A. Now (θ) 315.4°
Sep first 0.7 Sep last 0.224 Sep. Now (ρ) 0.313"
Mag pri 4.11 Mag sec 5.02 delta mag (ΔM) 0.91 Spectral class F5IV+F2V (yellow-white/yellow-white)
Pri motion ra +118 Sec motion ra
Pri motion dec -048 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
20375+1436 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Rotanev 106316 20 37 33 +14 35 43 BU 151 AB 2018 734 218 0.2 4.11 5.02 0.91 Y <===
Show 106316 20 37 33 +14 35 43 HJ 5545 AB,C 2011 32 139 12.1 3.68 13.50 9.82
Show Bet Del 106316 20 37 33 +14 35 43 STF 2704 AB,D 2014 60 317 47.8 3.68 11.40 7.72
Show 106316 20 37 33 +14 35 43 LBZ 1 AB,E 2014 9 271 112.6 3.68 11.63 7.95
Quintuple system
6 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name Rotanev Constellation Delphinus SAO 106316 HIP 101769
Tycho2 1100-01720-1 Gaia DR2 1810448909926616448 HD 196524 HR 7882
GC 28709 ADS 14073 BD BD+14 4369 Bayer Beta Delphini
Bayer name Bet Del Flamsteed 6 Delphini Flamsteed name 6 Del Distance 30.93
Distance ly 100.89 Bayer greek β Del
Other names Rotanen
Meaning 'Venator' in reverse
 
 
ORBITAL ELEMENTS
 
 
Period (P)9745.8d (26.68y)± 1.4 Periastron (T)37961.5m (1962.812y)± 4 Semi-major axis (a)0.43701a± 0.00016
Eccentricity (e)0.35595± 0.00069 Inclination (i)61.323°± 0.03 Longitude of periastron (ω)168.86°± 0.13
Node (Ω)357.179°± 0.029 Notesn ReferenceMut2010e
Equinox2000 Last observation2008 Grade1(1=Definitive, 9=Indet.)
label theta rho
2000 341.1 0.512
2001 345.2 0.547
2002 348.9 0.571
2003 352.3 0.586
2004 355.7 0.589
2005 359.0 0.581
2006 2.6 0.561
2007 6.5 0.529
2008 10.9 0.486
2009 16.4 0.431
2010 23.7 0.366
2011 34.5 0.293
2012 52.3 0.222
2013 83.4 0.173
2014 122.6 0.181
2015 150.9 0.229
2016 169.1 0.273
2017 183.7 0.282
2018 199.4 0.257
2019 220.0 0.218
2020 248.2 0.193
2021 278.2 0.207
2022 300.7 0.253
2023 315.4 0.313
2024 325.2 0.375
2025 332.4 0.432
2026 337.9 0.482
2027 342.4 0.524
2028 346.4 0.556
2029 350.0 0.577
2030 353.4 0.588


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


 
  


wds20375%2B1436b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
SUSPECTED ORBITAL ELEMENTS
 
 
 
 
SUSPECTED ORBITAL ELEMENTS SOLUTION #1
 
 
Identifier20375+1436 BU 151 B
coord_arcsec_2000203732.87+143542.7
Period (P)201.9d± 1.1 Periastron (T)53013.5m (2004.023y)± 7.8 Semi-major axis (a)0.217m± 0.057
Eccentricity (e)0.67± 0.24 Inclination (i)84.3°± 3.4 Longitude of periastron (ω)230°± 23
Node (Ω)124.2°± 3.9 Notesn ReferenceMut2010e
Equinox2000 Last observation2008 Grade9(1=Definitive, 9=Indet.)
label theta rho
2000-01-01 142.9
2001-01-01 131.7
2002-01-01 128.0
2003-01-01 124.6
2004-01-01 301.2
2005-01-01 153.8
2006-01-01 133.0
2007-01-01 128.8
2008-01-01 125.6
2009-01-01 313.4
2010-01-01 194.0
2011-01-01 134.8
2012-01-01 129.5
2013-01-01 126.4
2014-01-01 118.5
2015-01-01 269.7
2016-01-01 137.3
2017-01-01 130.4
2018-01-01 127.1
2019-01-01 122.7
2020-01-01 291.3
2021-01-01 141.5
2022-01-01 131.4
2023-01-01 127.9
2024-01-01 124.3
2025-01-01 299.7
2026-01-01 150.2
2027-01-01 132.7
2028-01-01 128.6
2029-01-01 125.3
2030-01-01 307.9


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


 
  


wds20375%2B1436r.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
SUSPECTED ORBITAL ELEMENTS
 
 
 
 
SUSPECTED ORBITAL ELEMENTS SOLUTION #2
 
 
Identifier20375+1436 BU 151 B
coord_arcsec_2000203732.87+143542.7
Period (P)435.3d± 5.6 Periastron (T)52941m (2003.825y)± 20 Semi-major axis (a)0.221m± 0.04
Eccentricity (e)0 Inclination (i)87.2°± 4.6 Longitude of periastron (ω)0°
Node (Ω)128.3°± 4 Notesn ReferenceMut2010e
Equinox2000 Last observation2008 Grade9(1=Definitive, 9=Indet.)
label theta rho
2000-01-01 117.7
2001-01-01 311.3
2002-01-01 307.7
2003-01-01 301.0
2004-01-01 132.0
2005-01-01 128.1
2006-01-01 122.8
2007-01-01 313.0
2008-01-01 308.4
2009-01-01 304.0
2010-01-01 134.3
2011-01-01 128.7
2012-01-01 124.9
2013-01-01 316.6
2014-01-01 309.0
2015-01-01 305.6
2016-01-01 140.8
2017-01-01 129.3
2018-01-01 126.1
2019-01-01 332.4
2020-01-01 309.7
2021-01-01 306.5
2022-01-01 217.5
2023-01-01 130.0
2024-01-01 126.9
2025-01-01 103.9
2026-01-01 310.5
2027-01-01 307.3
2028-01-01 295.7
2029-01-01 131.0
2030-01-01 127.6


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


 
  


wds20375%2B1436s.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic