16514+0113 STT 315 (21 Oph)

 
 
16H 51M 24.94S +01 12' 57.5" P.A. 309.2 SEP 0.76 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
2014
Obs
220
Pa first
161
Pa last
311
P.A. Now (θ)
309.2°
Sep first
0.8
Sep last
0.7
Sep. Now (ρ)
0.76"
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
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
last precise pa
310.6
last precise sep
0.689
 
 
ORBITAL ELEMENTS
 
 
Period (P)1115y± 50 Periastron (T)1976.4y± 0.5 Semi-major axis (a)1.68a± 0.06
Eccentricity (e)0.812± 0.025 Inclination (i)114.4°± 1 Longitude of periastron (ω)81°± 2
Node (Ω)133°± 1 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation1991
label rho theta
2000 0.521 318.9
2001 0.537 318.1
2002 0.553 317.4
2003 0.568 316.7
2004 0.583 316.0
2005 0.598 315.4
2006 0.612 314.8
2007 0.626 314.2
2008 0.639 313.7
2009 0.652 313.1
2010 0.665 312.6
2011 0.678 312.1
2012 0.690 311.7
2013 0.702 311.2
2014 0.714 310.8
2015 0.726 310.3
2016 0.737 309.9
2017 0.748 309.5
2018 0.759 309.2
2019 0.770 308.8
2020 0.780 308.4
2021 0.790 308.1
2022 0.801 307.7
2023 0.810 307.4
2024 0.820 307.0
2025 0.830 306.7
2026 0.839 306.4
2027 0.848 306.1
2028 0.857 305.8
2029 0.866 305.5
2030 0.874 305.2

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic