19474+1832 BLA 6 (Del Sge)
19h 47m 23.27s +18° 32' 03.3" P.A. 242.00 sep 0.1 mag 4.32,4.95 Sp M2II+B0V dist. 182.15 pc (594.17 l.y.)
Coord 2000 |
19474+1832 |
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Discov num |
BLA 6 |
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Comp |
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Coord arcsec 2000 |
19 47 23.27 +18 32 03.3 |
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Date first |
1975 |
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Date last |
1991 |
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Obs |
22 |
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Pa first |
137 |
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Pa last |
242 |
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P.A. Now (θ) |
141.7° |
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Sep first |
0.0 |
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Sep last |
0.115 |
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Sep. Now (ρ) |
0.057" |
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Mag pri |
4.32 |
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Mag sec |
4.95 |
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delta mag (ΔM) |
0.63 |
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Spectral class |
M2II+B0V (red/blue-white) |
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Pri motion ra |
+007 |
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Sec motion ra |
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Pri motion dec |
+008 |
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Sec motion dec |
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Notes |
N
O
(See Notes, Orbital solution) |
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This double is physical.
OTHER CATALOGS AND DESIGNATIONS
Name |
Del Sge |
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Constellation |
Sagitta |
|
SAO |
105259 |
|
HIP |
97365 |
|
Tycho2 |
1619-03542-1 |
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Gaia DR2 |
1824534959598087168 |
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HD |
187076 |
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HR |
7536 |
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GC |
27391 |
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BD |
BD+18 4240 |
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Bayer |
Delta Sagittae |
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Bayer name |
Del Sge |
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Flamsteed |
7 Sagittae |
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Flamsteed name |
7 Sge |
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FK5 |
743 |
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Distance |
182.15 |
|
Distance ly |
594.17 |
|
Bayer greek |
δ Sge |
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ORBITAL ELEMENTS
Period (P) | 10.11y | |
Periastron (T) | 1979.93y | |
Semi-major axis (a) | 0.051a | |
Eccentricity (e) | 0.44 | |
Inclination (i) | 140° | |
Longitude of periastron (ω) | 257.7° | |
Node (Ω) | 170.2° | |
Notes | n | |
Reference | Eat1995 | |
Equinox | | |
Last observation | | |
Grade | 3 | (1=Definitive, 9=Indet.) |
label |
theta |
rho |
2000 |
294.4 |
0.024 |
2001 |
193.6 |
0.035 |
2002 |
158.8 |
0.051 |
2003 |
137.4 |
0.057 |
2004 |
118.8 |
0.059 |
2005 |
100.1 |
0.058 |
2006 |
80.1 |
0.055 |
2007 |
58.1 |
0.053 |
2008 |
33.6 |
0.049 |
2009 |
3.5 |
0.042 |
2010 |
306.0 |
0.025 |
2011 |
199.9 |
0.032 |
2012 |
161.6 |
0.049 |
2013 |
139.5 |
0.057 |
2014 |
120.8 |
0.059 |
2015 |
102.2 |
0.058 |
2016 |
82.3 |
0.056 |
2017 |
60.7 |
0.053 |
2018 |
36.5 |
0.050 |
2019 |
7.3 |
0.043 |
2020 |
316.1 |
0.027 |
2021 |
207.3 |
0.030 |
2022 |
164.5 |
0.048 |
2023 |
141.7 |
0.057 |
2024 |
122.8 |
0.059 |
2025 |
104.3 |
0.058 |
2026 |
84.6 |
0.056 |
2027 |
63.2 |
0.053 |
2028 |
39.3 |
0.050 |
2029 |
11.0 |
0.044 |
2030 |
324.7 |
0.030 |
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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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