16514+0113 STT 315 (21 Oph)

 
 
16h 51m 24.94s +01° 12' 57.5" P.A. 309.00 sep 0.8 mag 5.78,7.26 Sp A2Vs dist. 116.14 pc (378.85 l.y.)
 
 
Coord 2000 16514+0113 Discov num STT 315 Comp Coord arcsec 2000 16 51 24.94 +01 12 57.5
Date first 1843 Date last 2019 Obs 223
Pa first 161 Pa last 309 P.A. Now (θ) 309°
Sep first 0.8 Sep last 0.75 Sep. Now (ρ) 0.75"
Mag pri 5.78 Mag sec 7.26 delta mag (ΔM) 1.48 Spectral class A2Vs (white)
Pri motion ra -024 Sec motion ra
Pri motion dec -012 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name 21 Oph Constellation Ophiuchus SAO 121911 HIP 82480
Tycho2 0384-02284-1 Gaia DR2 4384585813018600448 HD 152127 HR 6255
GC 22688 ADS 10230 BD BD+01 3323 Flamsteed 21 Ophiuchi
Flamsteed name 21 Oph Distance 116.14 Distance ly 378.85
 
 
ORBITAL ELEMENTS
 
 
Period (P)990y Periastron (T)1976.7y Semi-major axis (a)1.556a
Eccentricity (e)0.798 Inclination (i)114.3° Longitude of periastron (ω)82.5°
Node (Ω)133.7° Notesn ReferenceDoc2017e
Equinox2000 Last observation2014 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 318.9 0.518
2001 318.1 0.533
2002 317.4 0.549
2003 316.7 0.563
2004 316.0 0.578
2005 315.4 0.592
2006 314.8 0.606
2007 314.2 0.619
2008 313.6 0.632
2009 313.1 0.645
2010 312.6 0.658
2011 312.1 0.670
2012 311.6 0.682
2013 311.1 0.693
2014 310.7 0.705
2015 310.3 0.716
2016 309.8 0.726
2017 309.4 0.737
2018 309.0 0.747
2019 308.7 0.757
2020 308.3 0.767
2021 307.9 0.777
2022 307.6 0.787
2023 307.2 0.796
2024 306.9 0.805
2025 306.5 0.814
2026 306.2 0.823
2027 305.9 0.831
2028 305.6 0.840
2029 305.3 0.848
2030 305.0 0.856


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



 
 


wds16514%2B0113b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic