19471-1953 BU  146

 
 
19h 47m 06.75s -19 52' 50.4" P.A. 252.10 sep 0.7 mag 8.61,9.52 Sp G1/2V dist. 96.53 pc (314.88 l.y.)
 
 
Coord 2000
19471-1953
Discov num
BU  146
Comp
Coord arcsec 2000
19 47 06.75 -19 52 50.4
Date first
1873
Date last
2018
Obs
34
Pa first
290
Pa last
72
P.A. Now (θ)
252.1°
Sep first
1.0
Sep last
0.5
Sep. Now (ρ)
0.69"
Mag pri
8.61
Mag sec
9.52
delta mag (ΔM)
0.91
Spectral class
G1/2V (yellow)
Pri motion ra
-044
Sec motion ra
-044
Pri motion dec
-033
Sec motion dec
-033
Notes
O (Orbital solution)
Visually invisible, K-band or other infrared star This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
72
Precise sep
0.524
Constellation
Sagittarius
SAO
188563
HIP
97348
Tycho2
6320-00835-1
Gaia DR2
23370895232
HD
186752
ADS
12909
BD
BD-20 5705
Distance
96.53
Distance ly
314.88
last precise pa
72
last precise sep
0.524
 
 
ORBITAL ELEMENTS
 
 
Period (P)198.12y Periastron (T)2198.94y Semi-major axis (a)1.166a
Eccentricity (e)0.852 Inclination (i)65.3° Longitude of periastron (ω)271°
Node (Ω)220.6° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2018
label rho theta
2000 0.121 73.6
2001 0.076 150.9
2002 0.158 199.4
2003 0.243 213.3
2004 0.312 220.3
2005 0.367 225.0
2006 0.412 228.6
2007 0.450 231.5
2008 0.483 234.0
2009 0.511 236.2
2010 0.537 238.1
2011 0.559 239.9
2012 0.580 241.6
2013 0.599 243.2
2014 0.616 244.6
2015 0.631 246.0
2016 0.646 247.3
2017 0.659 248.6
2018 0.671 249.8
2019 0.683 251.0
2020 0.694 252.1
2021 0.704 253.3
2022 0.713 254.3
2023 0.722 255.4
2024 0.731 256.4
2025 0.739 257.4
2026 0.746 258.4
2027 0.753 259.3
2028 0.760 260.3
2029 0.766 261.2
2030 0.772 262.1

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






wds19471-1953c.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
19471-1953 BU 146 1991 29 28 0.6 8.61 9.52 G1/2V OD 194706.75-195250.4
19471-1953 BU 146 2009 32 235 0.6 8.61 9.52 G1/2V OD 194706.75-195250.4
19471-1953 BU 146 2010 33 58 0.5 8.61 9.52 G1/2V OD 194706.75-195250.4
19471-1953 BU 146 2018 34 72 0.5 8.61 9.52 G1/2V O 194706.75-195250.4

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