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° | |
Notes | n | |
Reference | Doc2017e | |
Equinox | 2000 | |
Last observation | 2014 | |
Grade | 4 | (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 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|