15405+1840 A 2076 (HD 139939)

 
 
15h 40m 28.45s +18° 40' 18.0" P.A. 187.00 sep 0.8 mag 8.28,8.44 Sp A2 dist. 309.6 pc (1009.92 l.y.)
 
 
Coord 2000 15405+1840 Discov num A  2076 Comp Coord arcsec 2000 15 40 28.45 +18 40 18.0
Date first 1909 Date last 2018 Obs 98
Pa first 146 Pa last 187.3 P.A. Now (θ) 187.3°
Sep first 0.2 Sep last 0.75 Sep. Now (ρ) 0.75"
Mag pri 8.28 Mag sec 8.44 delta mag (ΔM) 0.16 Spectral class A2 (white)
Pri motion ra -019 Sec motion ra -019
Pri motion dec +019 Sec motion dec +019
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 139939 Constellation Serpens SAO 101675 HIP 76769
Tycho2 1498-01693-1 Gaia DR2 1209819483295604864 HD 139939 ADS 9742
BD BD+19 3000 Distance 309.6 Distance ly 1009.92
 
 
ORBITAL ELEMENTS
 
 
Period (P)776y Periastron (T)1895y Semi-major axis (a)0.823a
Eccentricity (e)0.38 Inclination (i)73.8° Longitude of periastron (ω)95°
Node (Ω)1.3° Notes ReferenceZir2014a
Equinox2000 Last observation2008 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 183.1 0.707
2001 183.3 0.709
2002 183.4 0.711
2003 183.6 0.713
2004 183.8 0.714
2005 183.9 0.716
2006 184.1 0.718
2007 184.2 0.719
2008 184.4 0.721
2009 184.5 0.722
2010 184.7 0.724
2011 184.9 0.725
2012 185.0 0.726
2013 185.2 0.727
2014 185.3 0.728
2015 185.5 0.730
2016 185.6 0.731
2017 185.8 0.731
2018 185.9 0.732
2019 186.1 0.733
2020 186.2 0.734
2021 186.4 0.735
2022 186.5 0.735
2023 186.7 0.736
2024 186.8 0.737
2025 187.0 0.737
2026 187.1 0.738
2027 187.3 0.738
2028 187.4 0.739
2029 187.6 0.739
2030 187.7 0.739


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


 
  


wds15405%2B1840a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic		  
 
 
WDS 15405+1840 A 2076 (HD 139939) : NOTES
 
 
No records found.

 
 
REFERENCES
 
 
refcode metd author reference
Zir2014a orb - Zirm, H. 2014IAUDS.182....1Z
Zir2014a Inf. Circ. 182, 1, 2014
 
 
DISCOVERER
 
 
idgroup discov author
1 A Aitken, R.G.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
15405+1840 A 2076 2005 77 184 0.7 8.28 8.44 A2 D 154028.45+184018.0
15405+1840 A 2076 2007 79 184 0.7 8.28 8.44 A2 D 154028.45+184018.0
15405+1840 A 2076 2008 79 185 0.7 8.28 8.44 A2 D 154028.45+184018.0
15405+1840 A 2076 2012 84 185 0.7 8.28 8.44 A2 O 154028.45+184018.0
15405+1840 A 2076 2015 86 186 0.8 8.28 8.44 A2 O 154028.45+184018.0
15405+1840 A 2076 2017 88 186 0.7 8.28 8.44 A2 O 154028.45+184018.0
15405+1840 A 2076 2018 93 187 0.7 8.28 8.44 A2 O 154028.45+184018.0

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WDS 15405+1840 A 2076 (HD 139939) : VISUAL OBSERVATIONS REPORTS
 
 
Show date username difficulty separation pa_estim interest notes
Show 22/06/10 daedalus1 very difficult oblunged 180   This was an attempt to identify a separation below the Rayleigh limit of my 150mm refractor. Seeing: Pickering 6, good. x200: Slight elongation along a North-South axis. x300: Definite elongation in the direction described. x600: Large, turbulent artifact, affected so by the seeing, but I had the impression of two pinpoints in the glare of the turbulence, very occasional, and not enough to be sure of the binary nature of the star. x800: Absolutely unmistakeable! Two definite pinpoints within the turbulent artifact. Spurious disks just barely touching, split by a line somewhat darker than its surroundings.

 
 
WDS 15405+1840 A 2076 (HD 139939) : MEASURES
 
 
No records found.

 
 
WDS 15405+1840 (HD 139939) : VIRTUAL EYEPIECE
 
 

virtual eyepiece
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Radius:
Components only
 
 
WDS 15405+1840 (HD 139939) : ALADIN DSS IMAGE @
 
 
Error -22130
Not valid ID.
Error -22130
Not valid ID.
Error -27220
Not valid ID.