19474+1832 BLA   6 (Del Sge)

 
 
19h 47m 23.27s +18 32' 03.3" P.A. 207.30 sep 0.0 mag 4.32,4.95 Sp M2II+B0V dist. 182.15 pc (594.17 l.y.)
 
 
Coord 2000
19474+1832
Discov num
BLA   6
Comp
Coord arcsec 2000
19 47 23.27 +18 32 03.3
Date first
1975
Date last
1991
Obs
22
Pa first
137
Pa last
242
P.A. Now (θ)
207.3°
Sep first
0.0
Sep last
0.1
Sep. Now (ρ)
0.03"
Mag pri
4.32
Mag sec
4.95
delta mag (ΔM)
0.63
Spectral class
M2II+B0V (red/blue-white)
Pri motion ra
+007
Sec motion ra
Pri motion dec
+008
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
242
Precise sep
0.115
Name
Del Sge
Constellation
Sagitta
SAO
105259
HIP
97365
Tycho2
1619-03542-1
Gaia DR2
1824534959598087168
HD
187076
HR
7536
GC
27391
BD
BD+18 4240
Bayer
Delta Sagittae
Bayer name
Del Sge
Flamsteed
7 Sagittae
Flamsteed name
7 Sge
Distance
182.15
Distance ly
594.17
last precise pa
242
last precise sep
0.115
 
 
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° Note Grade3(1=Definitive, 9=Indet.)
Equinox Last observation
label rho theta
2000 0.024 294.4
2001 0.035 193.6
2002 0.051 158.8
2003 0.057 137.4
2004 0.059 118.8
2005 0.058 100.1
2006 0.055 80.1
2007 0.053 58.1
2008 0.049 33.6
2009 0.042 3.5
2010 0.025 306.0
2011 0.032 199.9
2012 0.049 161.6
2013 0.057 139.5
2014 0.059 120.8
2015 0.058 102.2
2016 0.056 82.3
2017 0.053 60.7
2018 0.050 36.5
2019 0.043 7.3
2020 0.027 316.1
2021 0.030 207.3
2022 0.048 164.5
2023 0.057 141.7
2024 0.059 122.8
2025 0.058 104.3
2026 0.056 84.6
2027 0.053 63.2
2028 0.050 39.3
2029 0.044 11.0
2030 0.030 324.7


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.



 
 


wds19474%2B1832a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
19474+1832 BLA 6 1991 22 62 0.1 4.32 4.95 M2II+A0V NOD 194723.27+183203.3

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