16514+0113 STT 315 (21 Oph)

 
 
16h 51m 24.94s +01 12' 57.5" P.A. 309.5 sep 0.75 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)
309.5°
Sep first
0.8
Sep last
0.7
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
 
 
Precise pa
310.6
Precise sep
0.689
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)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° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2014
label rho theta
2000 0.518 318.9
2001 0.533 318.1
2002 0.549 317.4
2003 0.563 316.7
2004 0.578 316.0
2005 0.592 315.4
2006 0.606 314.8
2007 0.619 314.2
2008 0.632 313.6
2009 0.645 313.1
2010 0.658 312.6
2011 0.670 312.1
2012 0.682 311.6
2013 0.693 311.1
2014 0.705 310.7
2015 0.716 310.3
2016 0.726 309.8
2017 0.737 309.4
2018 0.747 309.0
2019 0.757 308.7
2020 0.767 308.3
2021 0.777 307.9
2022 0.787 307.6
2023 0.796 307.2
2024 0.805 306.9
2025 0.814 306.5
2026 0.823 306.2
2027 0.831 305.9
2028 0.840 305.6
2029 0.848 305.3
2030 0.856 305.0

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

grafico orbita





wds16514%2B0113b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
16514+0113 STT 315 2005 212 317 0.6 5.78 7.26 A2Vs NOD 165124.94+011257.5
16514+0113 STT 315 2010 215 311 0.6 5.78 7.26 A2Vs NOD 165124.94+011257.5
16514+0113 STT 315 2011 219 312 0.7 5.78 7.26 A2Vs NOD 165124.94+011257.5
16514+0113 STT 315 2014 219 311 0.7 5.78 7.26 A2Vs NOD 165124.94+011257.5

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