18017+4011 STF 2267 (HD 164941)

 
 
18h 01m 41.17s +40° 10' 41.9" P.A. 280.00 sep 0.4 mag 8.41,8.84 Sp A3 dist. 249.38 pc (813.48 l.y.)
 
 
Coord 2000 18017+4011 Discov num STF2267 Comp Coord arcsec 2000 18 01 41.17 +40 10 41.9
Date first 1830 Date last 2018 Obs 136
Pa first 234 Pa last 280.4 P.A. Now (θ) 280.4°
Sep first 1.4 Sep last 0.434 Sep. Now (ρ) 0.434"
Mag pri 8.41 Mag sec 8.84 delta mag (ΔM) 0.43 Spectral class A3 (white)
Pri motion ra -003 Sec motion ra -003
Pri motion dec +014 Sec motion dec +014
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 164941 Constellation Hercules SAO 47149 HIP 88284
Tycho2 3106-00396-1 Gaia DR2 4611347682380110080 HD 164941 GC 24560
ADS 11001 BD BD+40 3263 Distance 249.38 Distance ly 813.48
 
 
ORBITAL ELEMENTS
 
 
Period (P)1660y Periastron (T)2121y Semi-major axis (a)1.368a
Eccentricity (e)0.69 Inclination (i)55.5° Longitude of periastron (ω)351.9°
Node (Ω)37.3° Notes ReferenceZir2014a
Equinox2000 Last observation2011 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 266.9 0.607
2001 267.3 0.602
2002 267.8 0.597
2003 268.3 0.591
2004 268.7 0.586
2005 269.2 0.581
2006 269.7 0.575
2007 270.2 0.570
2008 270.8 0.565
2009 271.3 0.559
2010 271.8 0.554
2011 272.4 0.549
2012 272.9 0.544
2013 273.5 0.538
2014 274.1 0.533
2015 274.7 0.528
2016 275.3 0.523
2017 275.9 0.518
2018 276.5 0.513
2019 277.1 0.507
2020 277.8 0.502
2021 278.5 0.497
2022 279.1 0.492
2023 279.8 0.487
2024 280.5 0.483
2025 281.3 0.478
2026 282.0 0.473
2027 282.8 0.468
2028 283.5 0.463
2029 284.3 0.459
2030 285.1 0.454


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


 
  


wds18017%2B4011a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic