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 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) 141.7°
Sep first 0.0 Sep last 0.115 Sep. Now (ρ) 0.057"
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
 
 
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 FK5 743 Distance 182.15
Distance ly 594.17 Bayer greek δ Sge
 
 
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° Notesn ReferenceEat1995
Equinox Last observation Grade3(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


 
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