18428+5938 STF 2398 AB (HD 173739)
18h 42m 46.69s +59° 37' 49.4" P.A. 181.00 sep 11.4 mag 9.11,9.96 Sp M3V+M3.5 dist. 3.57 pc (11.65 l.y.)
Coord 2000 |
18428+5938 |
|
Discov num |
STF2398 |
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Comp |
AB |
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Coord arcsec 2000 |
18 42 46.69 +59 37 49.4 |
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Date first |
1831 |
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Date last |
2020 |
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Obs |
641 |
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Pa first |
136 |
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Pa last |
180.8 |
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P.A. Now (θ) |
180.8° |
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Sep first |
14.0 |
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Sep last |
11.4 |
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Sep. Now (ρ) |
11.4" |
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Mag pri |
9.11 |
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Mag sec |
9.96 |
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delta mag (ΔM) |
0.85 |
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Spectral class |
M3V+M3.5 (red/red) |
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Pri motion ra |
-133 |
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Sec motion ra |
-139 |
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Pri motion dec |
+180 |
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Sec motion dec |
+185 |
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Notes |
N
O
P
(See Notes, Orbital solution, 100-year proper motion) |
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rPM=0.034 (< 0.3, Physical double)
This double is physical.
18428+5938 SYSTEM COMPONENTS
Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
Show |
HD 173739 |
31128 |
18 42 47 +59 37 49 |
STF 2398 AB |
2020 |
641 |
181 |
11.4 |
9.11 |
9.96 |
0.85 |
Y |
<=== |
Show |
|
31128 |
18 42 47 +59 37 49 |
STF 2398 AC |
2013 |
21 |
158 |
216.8 |
9.11 |
12.24 |
3.13 |
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Show |
|
31128 |
18 42 47 +59 37 49 |
POP 1224 AD |
2008 |
3 |
110 |
100.0 |
9.11 |
13.50 |
4.39 |
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Show |
|
31129 |
18 42 47 +59 37 37 |
STF 2398 BC |
2000 |
18 |
157 |
202.7 |
9.96 |
12.24 |
2.28 |
|
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Quadruple system
4 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 173739 |
|
Constellation |
Draco |
|
SAO |
31128 |
|
HIP |
91768 |
|
Tycho2 |
3930-01791-1 |
|
HD |
173739 |
|
GC |
25648 |
|
ADS |
11632 |
|
GL |
Gl 725A |
|
BD |
BD+59 1915 |
|
Distance |
3.57 |
|
Distance ly |
11.65 |
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ORBITAL ELEMENTS
Period (P) | 408y | |
Periastron (T) | 1775y | |
Semi-major axis (a) | 13.88a | |
Eccentricity (e) | 0.53 | |
Inclination (i) | 66° | |
Longitude of periastron (ω) | 234.6° | |
Node (Ω) | 136.9° | |
Notes | n | |
Reference | Hei1987b | |
Equinox | 2000 | |
Last observation | 1987 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
173.6 |
12.596 |
2001 |
173.9 |
12.516 |
2002 |
174.3 |
12.436 |
2003 |
174.7 |
12.356 |
2004 |
175.1 |
12.275 |
2005 |
175.5 |
12.194 |
2006 |
175.9 |
12.113 |
2007 |
176.3 |
12.032 |
2008 |
176.7 |
11.950 |
2009 |
177.1 |
11.869 |
2010 |
177.5 |
11.787 |
2011 |
177.9 |
11.704 |
2012 |
178.4 |
11.622 |
2013 |
178.8 |
11.539 |
2014 |
179.2 |
11.457 |
2015 |
179.7 |
11.374 |
2016 |
180.2 |
11.291 |
2017 |
180.6 |
11.208 |
2018 |
181.1 |
11.125 |
2019 |
181.6 |
11.042 |
2020 |
182.0 |
10.959 |
2021 |
182.5 |
10.876 |
2022 |
183.0 |
10.793 |
2023 |
183.5 |
10.710 |
2024 |
184.1 |
10.627 |
2025 |
184.6 |
10.544 |
2026 |
185.1 |
10.462 |
2027 |
185.7 |
10.379 |
2028 |
186.2 |
10.297 |
2029 |
186.8 |
10.215 |
2030 |
187.3 |
10.132 |
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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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