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Doubles in session


Current system
20012-3835
HDO 294


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HDS2878



Selections
Full WDS
Binocular doubles
Binary Systems
Triple Systems
Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

20012-3835 HDO 294

 
 
20h 01m 12.74s -38° 35' 12.7" P.A. 36.70 sep 1.4 mag 8.08,9.11 Sp F3V dist. 68.49 pc (223.41 l.y.)
 
 
Coord 2000
20012-3835
 Discov num
HDO 294
 Comp
Coord arcsec 2000
20 01 12.74 -38 35 12.7
Date first
1897
 Date last
2019
 Obs
63
Pa first
120
 Pa last
33
 P.A. Now (θ)
36.7°
Sep first
1.5
 Sep last
1.3
 Sep. Now (ρ)
1.4"
Mag pri
8.08
 Mag sec
9.11
 delta mag (ΔM)
1.03
 Spectral class
F3V (yellow-white)
Pri motion ra
+018
 Sec motion ra
+018
Pri motion dec
-070
 Sec motion dec
-070
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
33.2
 Precise sep
1.26
 Constellation
Sagittarius
 SAO
211734
HIP
98556
 Tycho2
7947-00530-1
 Gaia DR2
6690907208575405056
 HD
189386
CD
CD-3813809
 CP
CP-38 7919
 Distance
68.49
 Distance ly
223.41
last precise pa
33.2
 last precise sep
1.26
 
 
ORBITAL ELEMENTS
 
 
Period (P)4484.5y Periastron (T)1922.73y Semi-major axis (a)4.916a
Eccentricity (e)0.9474 Inclination (i)40.86° Longitude of periastron (ω)137.62°
Node (Ω)116.65° Note Grade5(1=Definitive, 9=Indet.)
Equinox1900 Last observation1974
label rho theta
2000 1.173 30.7
2001 1.184 31.0
2002 1.195 31.4
2003 1.206 31.7
2004 1.217 32.0
2005 1.228 32.3
2006 1.239 32.6
2007 1.250 32.9
2008 1.261 33.2
2009 1.271 33.5
2010 1.282 33.8
2011 1.293 34.1
2012 1.304 34.4
2013 1.314 34.7
2014 1.325 34.9
2015 1.336 35.2
2016 1.346 35.5
2017 1.357 35.7
2018 1.367 36.0
2019 1.378 36.2
2020 1.388 36.5
2021 1.399 36.7
2022 1.409 36.9
2023 1.419 37.2
2024 1.430 37.4
2025 1.440 37.6
2026 1.450 37.9
2027 1.460 38.1
2028 1.471 38.3
2029 1.481 38.5
2030 1.491 38.7


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


 
  


wds20012-3835a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
20012-3835 HDO 294 2002 52 30 1.2 8.08 9.11 F3V NOD 200112.74-383512.7
20012-3835 HDO 294 2008 53 30 1.2 8.08 9.11 F3V NOD 200112.74-383512.7
20012-3835 HDO 294 2010 54 29 1.2 8.08 9.11 F3V NOD 200112.74-383512.7
20012-3835 HDO 294 2013 57 31 1.2 8.08 9.11 F3V NO 200112.74-383512.7
20012-3835 HDO 294 2016 60 35 1.3 8.08 9.11 F3V NO 200112.74-383512.7
20012-3835 HDO 294 2017 61 34 1.3 8.08 9.11 F3V NO 200112.74-383512.7

If you need more information about this double, apply for a data request form to the WDS.