19474+1832 BLA   6 (Del Sge)

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	62		P.A. Now (θ)	316.1°
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)

Visually invisible, K-band or other infrared star This double is physical.

Precise pa	62		Precise sep	0.115		Name	Del Sge		Constellation	Sagitta
SAO	105259		HIP	97365		Tycho2	1619-03542-1		Gaia DR2	59598087168
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	62		last precise sep	0.115

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			Grade	3	(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 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

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

If you need more information about this double, apply for a data request form to the WDS.