18488-1836 KUI 88 (HD 173928)
18h 48m 45.41s -18° 36' 04.2" P.A. 153.00 sep 0.5 mag 6.87,8.14 Sp A1+K0 dist. 312.5 pc (1019.38 l.y.)
Coord 2000 |
18488-1836 |
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Discov num |
KUI 88 |
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Comp |
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Coord arcsec 2000 |
18 48 45.41 -18 36 04.2 |
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Date first |
1933 |
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Date last |
2018 |
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Obs |
42 |
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Pa first |
195 |
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Pa last |
152.9 |
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P.A. Now (θ) |
152.9° |
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Sep first |
0.3 |
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Sep last |
0.498 |
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Sep. Now (ρ) |
0.498" |
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Mag pri |
6.87 |
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Mag sec |
8.14 |
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delta mag (ΔM) |
1.27 |
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Spectral class |
A1+K0 (white/yellow-orange) |
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Pri motion ra |
+003 |
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Sec motion ra |
+003 |
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Pri motion dec |
-002 |
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Sec motion dec |
-002 |
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Notes |
O
(Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
HD 173928 |
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Constellation |
Sagittarius |
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SAO |
161848 |
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HIP |
92301 |
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Tycho2 |
6285-00193-1 |
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Gaia DR2 |
4098425954745263104 |
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HD |
173928 |
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HR |
7072 |
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GC |
25761 |
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BD |
BD-18 5079 |
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Distance |
312.5 |
|
Distance ly |
1019.38 |
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ORBITAL ELEMENTS
Period (P) | 909.7y | |
Periastron (T) | 1865y | |
Semi-major axis (a) | 0.598a | |
Eccentricity (e) | 0.341 | |
Inclination (i) | 124° | |
Longitude of periastron (ω) | 232° | |
Node (Ω) | 137.8° | |
Notes | | |
Reference | Hrt2013c | |
Equinox | 2000 | |
Last observation | 2003 | |
Grade | 4 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
159.9 |
0.467 |
2001 |
159.5 |
0.470 |
2002 |
159.2 |
0.473 |
2003 |
158.9 |
0.476 |
2004 |
158.5 |
0.479 |
2005 |
158.2 |
0.482 |
2006 |
157.9 |
0.485 |
2007 |
157.6 |
0.488 |
2008 |
157.3 |
0.490 |
2009 |
157.0 |
0.493 |
2010 |
156.7 |
0.496 |
2011 |
156.4 |
0.499 |
2012 |
156.1 |
0.501 |
2013 |
155.8 |
0.504 |
2014 |
155.5 |
0.507 |
2015 |
155.2 |
0.510 |
2016 |
154.9 |
0.512 |
2017 |
154.6 |
0.515 |
2018 |
154.3 |
0.518 |
2019 |
154.1 |
0.520 |
2020 |
153.8 |
0.523 |
2021 |
153.5 |
0.525 |
2022 |
153.3 |
0.528 |
2023 |
153.0 |
0.531 |
2024 |
152.7 |
0.533 |
2025 |
152.5 |
0.536 |
2026 |
152.2 |
0.538 |
2027 |
152.0 |
0.541 |
2028 |
151.7 |
0.543 |
2029 |
151.4 |
0.545 |
2030 |
151.2 |
0.548 |
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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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