09100-2845 B   179

 
 
09h 09m 57.24s -28 45' 20.7" P.A. 112.70 sep 0.1 mag 9.44,9.64 Sp K0V dist. 55.9 pc (182.35 l.y.)
 
 
Coord 2000
09100-2845
Discov num
B   179
Comp
Coord arcsec 2000
09 09 57.24 -28 45 20.7
Date first
1927
Date last
2019
Obs
38
Pa first
161
Pa last
132
P.A. Now (θ)
112.7°
Sep first
0.4
Sep last
0.2
Sep. Now (ρ)
0.12"
Mag pri
9.44
Mag sec
9.64
delta mag (ΔM)
0.2
Spectral class
K0V (yellow-orange)
Pri motion ra
-013
Sec motion ra
-013
Pri motion dec
-077
Sec motion dec
-077
Notes
O (Orbital solution)
Visually invisible, K-band or other infrared star This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
132.3
Precise sep
0.178
Constellation
Pyxis
SAO
177059
HIP
45003
Tycho2
6598-01373-1
Gaia DR2
16217477504
HD
78921
ADS
7223
CD
CD-28 6981
CP
CP-28 3635
Distance
55.9
Distance ly
182.35
last precise pa
132.3
last precise sep
0.178
 
 
ORBITAL ELEMENTS
 
 
Period (P)80.35y± 0.84 Periastron (T)2026.88y± 0.62 Semi-major axis (a)0.372a± 0.006
Eccentricity (e)0.562± 0.025 Inclination (i)116.3°± 1.3 Longitude of periastron (ω)158.5°± 3
Node (Ω)169.4°± 1.1 Note Grade3(1=Definitive, 9=Indet.)
Equinox Last observation2018
label rho theta
2000 0.534 169.5
2001 0.526 168.7
2002 0.518 167.8
2003 0.508 167.0
2004 0.497 166.1
2005 0.485 165.1
2006 0.472 164.1
2007 0.458 163.1
2008 0.442 161.9
2009 0.425 160.7
2010 0.407 159.4
2011 0.388 158.0
2012 0.367 156.4
2013 0.344 154.6
2014 0.321 152.5
2015 0.295 150.1
2016 0.268 147.3
2017 0.240 143.7
2018 0.211 139.3
2019 0.181 133.3
2020 0.151 125.0
2021 0.123 112.7
2022 0.101 94.3
2023 0.092 69.2
2024 0.098 43.1
2025 0.116 22.9
2026 0.138 8.7
2027 0.156 358.2
2028 0.167 349.5
2029 0.171 341.6
2030 0.168 333.7

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






wds09100-2845c.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
09100-2845 B 179 1998 29 349 0.4 9.44 9.64 K0V NOD 090957.24-284520.7
09100-2845 B 179 2009 30 160 0.4 9.44 9.64 K0V NOD 090957.24-284520.7
09100-2845 B 179 2010 31 159 0.4 9.44 9.64 K0V NOD 090957.24-284520.7
09100-2845 B 179 2011 32 158 0.4 9.44 9.64 K0V NOD 090957.24-284520.7
09100-2845 B 179 2013 33 155 0.3 9.44 9.64 K0V NOD 090957.24-284520.7
09100-2845 B 179 2015 34 148 0.3 9.44 9.64 K0V O 090957.24-284520.7
09100-2845 B 179 2016 35 144 0.2 9.44 9.64 K0V O 090957.24-284520.7
09100-2845 B 179 2018 37 139 0.2 9.44 9.64 K0V O 090957.24-284520.7
09100-2845 B 179 2019 38 132 0.2 9.44 9.64 K0V O 090957.24-284520.7

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