19026-2953 HDO 150 AB (Ascella)
19h 02m 36.72s -29° 52' 48.4" P.A. 210.00 sep 0.2 mag 3.27,3.48 Sp A2III dist. 27.04 pc (88.2 l.y.)
| Coord 2000 |
19026-2953 |
|
Discov num |
HDO 150 |
|
Comp |
AB |
|
Coord arcsec 2000 |
19 02 36.72 -29 52 48.4 |
|
| Date first |
1867 |
|
Date last |
2021 |
|
Obs |
212 |
|
| Pa first |
258 |
|
Pa last |
209.7 |
|
P.A. Now (θ) |
151.3° |
|
| Sep first |
0.9 |
|
Sep last |
0.242 |
|
Sep. Now (ρ) |
0.174" |
|
| Mag pri |
3.27 |
|
Mag sec |
3.48 |
|
delta mag (ΔM) |
0.21 |
|
Spectral class |
A2III (white) |
|
| Pri motion ra |
-015 |
|
Sec motion ra |
|
|
| Pri motion dec |
+004 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
19026-2953 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
Ascella |
187600 |
19 02 37 -29 52 48 |
HDO 150 AB |
2021 |
212 |
210 |
0.2 |
3.27 |
3.48 |
0.21 |
Y |
<=== |
| Show |
Zet Sgr |
187600 |
19 02 37 -29 52 48 |
H 5 78 AB,C |
2017 |
9 |
302 |
72.3 |
2.60 |
10.63 |
8.03 |
|
|
Triple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Common name |
Ascella |
|
Constellation |
Sagittarius |
|
SAO |
187600 |
|
HIP |
93506 |
|
| Tycho2 |
6885-02837-1 |
|
HD |
176687 |
|
HR |
7194 |
|
GC |
26161 |
|
| ADS |
11950 |
|
CD |
CD-3016575 |
|
CP |
CP-30 5798 |
|
Bayer |
Zeta Sagittarii |
|
| Bayer name |
Zet Sgr |
|
Flamsteed |
38 Sagittarii |
|
Flamsteed name |
38 Sgr |
|
Distance |
27.04 |
|
| Distance ly |
88.2 |
|
Bayer greek |
ζ Sgr |
|
ORBITAL ELEMENTS
| Period (P) | 21y | ± 0.01 |
Periastron (T) | 2005.99y | ± 0.03 |
Semi-major axis (a) | 0.489a | ± 0.001 |
| Eccentricity (e) | 0.211 | ± 0.001 |
Inclination (i) | 111.1° | ± 0.1 |
Longitude of periastron (ω) | 7.2° | ± 0.6 |
| Node (Ω) | 74° | ± 0.1 |
Notes | n | |
Reference | DRs2012 | |
| Equinox | | |
Last observation | 2011 | |
Grade | 1 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
219.0 |
0.296 |
| 2001 |
195.1 |
0.206 |
| 2002 |
151.3 |
0.174 |
| 2003 |
113.0 |
0.230 |
| 2004 |
93.1 |
0.314 |
| 2005 |
81.1 |
0.374 |
| 2006 |
71.3 |
0.383 |
| 2007 |
60.3 |
0.335 |
| 2008 |
43.3 |
0.249 |
| 2009 |
8.1 |
0.172 |
| 2010 |
317.7 |
0.187 |
| 2011 |
289.3 |
0.279 |
| 2012 |
275.8 |
0.382 |
| 2013 |
267.9 |
0.471 |
| 2014 |
262.2 |
0.537 |
| 2015 |
257.6 |
0.578 |
| 2016 |
253.4 |
0.591 |
| 2017 |
249.2 |
0.578 |
| 2018 |
244.6 |
0.539 |
| 2019 |
239.1 |
0.476 |
| 2020 |
231.4 |
0.393 |
| 2021 |
219.0 |
0.296 |
| 2022 |
195.1 |
0.206 |
| 2023 |
151.3 |
0.174 |
| 2024 |
113.0 |
0.230 |
| 2025 |
93.1 |
0.314 |
| 2026 |
81.1 |
0.374 |
| 2027 |
71.3 |
0.383 |
| 2028 |
60.3 |
0.335 |
| 2029 |
43.3 |
0.249 |
| 2030 |
8.1 |
0.172 |
|
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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