19155-2515 B   430 (Psi Sgr)

 
 
19h 15m 32.40s -25 15' 23.8" P.A. 92.7 sep 0.07 mag 5.50,5.70 Sp A8V+G8III dist. 91.49 pc (298.44 l.y.)
 
 
Coord 2000
19155-2515
Discov num
B   430
Comp
Coord arcsec 2000
19 15 32.40 -25 15 23.8
Date first
1926
Date last
2017
Obs
70
Pa first
114
Pa last
92
P.A. Now (θ)
92.7°
Sep first
0.2
Sep last
0.0
Sep. Now (ρ)
0.07"
Mag pri
5.50
Mag sec
5.70
delta mag (ΔM)
0.2
Spectral class
A8V+G8III (white/yellow)
Pri motion ra
+044
Sec motion ra
Pri motion dec
-031
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
91.5
Precise sep
0.033
Name
Psi Sgr
Constellation
Sagittarius
SAO
187882
HIP
94643
HD
179950
HR
7292
GC
26516
ADS
12214
Bayer
Psi Sagittarii
Bayer name
Psi Sgr
Flamsteed
42 Sagittarii
Flamsteed name
42 Sgr
Distance
91.49
Distance ly
298.44
last precise pa
91.5
last precise sep
0.033
 
 
ORBITAL ELEMENTS
 
 
Period (P)19.95y± 0.09 Periastron (T)2014.98y± 0.41 Semi-major axis (a)0.132a± 0.004
Eccentricity (e)0.506± 0.042 Inclination (i)82.1°± 1 Longitude of periastron (ω)7.5°± 5.7
Node (Ω)285.1°± 0.5 Note Grade2(1=Definitive, 9=Indet.)
Equinox2000 Last observation2014
label rho theta
2000 0.137 100.2
2001 0.162 101.9
2002 0.180 103.1
2003 0.192 104.2
2004 0.197 105.2
2005 0.197 106.1
2006 0.191 107.1
2007 0.180 108.2
2008 0.163 109.5
2009 0.140 111.1
2010 0.111 113.5
2011 0.077 117.8
2012 0.038 130.4
2013 0.017 231.4
2014 0.051 276.3
2015 0.064 286.3
2016 0.034 301.7
2017 0.023 68.1
2018 0.067 92.7
2019 0.107 97.8
2020 0.138 100.3
2021 0.163 101.9
2022 0.181 103.2
2023 0.192 104.2
2024 0.197 105.2
2025 0.197 106.2
2026 0.191 107.2
2027 0.179 108.3
2028 0.162 109.5
2029 0.139 111.2
2030 0.110 113.6

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

grafico orbita





wds19155-2515b.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
19155-2515 B 430 2006 64 108 0.2 5.50 5.70 A8V+G8III NO 191532.40-251523.8
19155-2515 B 430 2008 67 110 0.1 5.50 5.70 A8V+G8III NO 191532.40-251523.8
19155-2515 B 430 2013 66 271 0.0 5.50 5.70 A8V G8III NO 191532.40-251523.8
19155-2515 B 430 2014 68 284 0.1 5.50 5.70 A8V+G8III NO 191532.40-251523.8
19155-2515 B 430 2015 69 290 0.1 5.50 5.70 A8V+G8III NO 191532.40-251523.8
19155-2515 B 430 2017 70 92 0.0 5.50 5.70 A8V+G8III NO 191532.40-251523.8

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