18103-2913 HO  428

 
 
18h 10m 18.15s -29 12' 47.4" P.A. 93.5 sep 0.41 mag 8.32,8.75 Sp A4V
 
 
Coord 2000
18103-2913
Discov num
HO  428
Comp
Coord arcsec 2000
18 10 18.15 -29 12 47.4
Date first
1893
Date last
2008
Obs
17
Pa first
80
Pa last
91
P.A. Now (θ)
93.5°
Sep first
0.7
Sep last
0.4
Sep. Now (ρ)
0.41"
Mag pri
8.32
Mag sec
8.75
delta mag (ΔM)
0.43
Spectral class
A4V (white)
Pri motion ra
+009
Sec motion ra
+009
Pri motion dec
-005
Sec motion dec
-005
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
90.5
Precise sep
0.441
Constellation
Sagittarius
SAO
186391
Tycho2
6855-02083-1
HD
166080
ADS
11112
last precise pa
90.5
last precise sep
0.441
 
 
ORBITAL ELEMENTS
 
 
Period (P)815y Periastron (T)2635y Semi-major axis (a)1.42a
Eccentricity (e)0.636 Inclination (i)87° Longitude of periastron (ω)288.4°
Node (Ω)80.2° Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation1991
label rho theta
2000 0.504 90.4
2001 0.499 90.5
2002 0.494 90.7
2003 0.489 90.8
2004 0.484 91.0
2005 0.480 91.1
2006 0.475 91.3
2007 0.470 91.4
2008 0.465 91.6
2009 0.460 91.8
2010 0.455 91.9
2011 0.450 92.1
2012 0.444 92.3
2013 0.439 92.5
2014 0.434 92.7
2015 0.429 92.9
2016 0.424 93.1
2017 0.419 93.3
2018 0.414 93.5
2019 0.409 93.7
2020 0.404 93.9
2021 0.399 94.1
2022 0.394 94.4
2023 0.389 94.6
2024 0.384 94.8
2025 0.379 95.1
2026 0.373 95.3
2027 0.368 95.6
2028 0.363 95.9
2029 0.358 96.1
2030 0.353 96.4

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

grafico orbita





wds18103-2913a.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
18103-2913 HO 428 1991 16 90 0.5 8.32 8.75 A4V O 181018.15-291247.4
18103-2913 HO 428 2008 17 91 0.4 8.32 8.75 A4V O 181018.15-291247.4

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