18463-2721 B 405 (HD 173427)

18h 46m 16.27s -27° 20' 46.9" P.A. 136.00 sep 0.5 mag 8.66,9.30 Sp G2V dist. 72.15 pc (235.35 l.y.)

Coord 2000 18463-2721 Discov num B   405 Comp Coord arcsec 2000 18 46 16.27 -27 20 46.9
Date first 1927 Date last 2018 Obs 20
Pa first 143 Pa last 135.8 P.A. Now (θ) 135.8°
Sep first 0.5 Sep last 0.503 Sep. Now (ρ) 0.503"
Mag pri 8.66 Mag sec 9.30 delta mag (ΔM) 0.64 Spectral class G2V (yellow)
Pri motion ra -019 Sec motion ra -019
Pri motion dec -063 Sec motion dec -063
Notes O (Orbital solution)




This double is physical.



OTHER CATALOGS AND DESIGNATIONS

Name HD 173427 Constellation Sagittarius SAO 187251 HIP 92104
Tycho2 6867-00158-1 Gaia DR2 4072177004404608640 HD 173427 GC 25681
ADS 11643 CD CD-2713181 CP CP-27 6516 Distance 72.15
Distance ly 235.35




ORBITAL ELEMENTS

Period (P)87.95y Periastron (T)1967.62y Semi-major axis (a)0.343a
Eccentricity (e)0.559 Inclination (i)135.3° Longitude of periastron (ω)14°
Node (Ω)336.5° Notes ReferenceMsn1999c
Equinox2000 Last observation1991 Grade4(1=Definitive, 9=Indet.)

label theta rho
2000 158.5 0.507
2001 157.4 0.512
2002 156.3 0.516
2003 155.2 0.520
2004 154.2 0.523
2005 153.2 0.525
2006 152.1 0.527
2007 151.1 0.528
2008 150.1 0.529
2009 149.1 0.529
2010 148.1 0.529
2011 147.1 0.528
2012 146.0 0.526
2013 145.0 0.524
2014 144.0 0.522
2015 142.9 0.519
2016 141.9 0.515
2017 140.8 0.511
2018 139.7 0.506
2019 138.6 0.501
2020 137.4 0.495
2021 136.2 0.489
2022 135.0 0.482
2023 133.8 0.475
2024 132.5 0.467
2025 131.2 0.459
2026 129.8 0.450
2027 128.4 0.441
2028 126.9 0.431
2029 125.3 0.420
2030 123.7 0.410


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



 
 


wds18463-2721a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic