18103-2913 HO 428 (HD 166080)
18h 10m 18.15s -29° 12' 47.4" P.A. 92.00 sep 0.4 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 |
2018 |
|
Obs |
18 |
|
Pa first |
80 |
|
Pa last |
92.2 |
|
P.A. Now (θ) |
92.2° |
|
Sep first |
0.7 |
|
Sep last |
0.367 |
|
Sep. Now (ρ) |
0.367" |
|
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
Name |
HD 166080 |
|
Constellation |
Sagittarius |
|
SAO |
186391 |
|
Tycho2 |
6855-02083-1 |
|
Gaia DR2 |
4050512158618448128 |
|
HD |
166080 |
|
ADS |
11112 |
|
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° | |
Notes | | |
Reference | USN2002 | |
Equinox | 2000 | |
Last observation | 1991 | |
Grade | 5 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
90.4 |
0.504 |
2001 |
90.5 |
0.499 |
2002 |
90.7 |
0.494 |
2003 |
90.8 |
0.489 |
2004 |
91.0 |
0.484 |
2005 |
91.1 |
0.480 |
2006 |
91.3 |
0.475 |
2007 |
91.4 |
0.470 |
2008 |
91.6 |
0.465 |
2009 |
91.8 |
0.460 |
2010 |
91.9 |
0.455 |
2011 |
92.1 |
0.450 |
2012 |
92.3 |
0.444 |
2013 |
92.5 |
0.439 |
2014 |
92.7 |
0.434 |
2015 |
92.9 |
0.429 |
2016 |
93.1 |
0.424 |
2017 |
93.3 |
0.419 |
2018 |
93.5 |
0.414 |
2019 |
93.7 |
0.409 |
2020 |
93.9 |
0.404 |
2021 |
94.1 |
0.399 |
2022 |
94.4 |
0.394 |
2023 |
94.6 |
0.389 |
2024 |
94.8 |
0.384 |
2025 |
95.1 |
0.379 |
2026 |
95.3 |
0.373 |
2027 |
95.6 |
0.368 |
2028 |
95.9 |
0.363 |
2029 |
96.1 |
0.358 |
2030 |
96.4 |
0.353 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|