21238-0635 S 788 (HD 203667)

Coord 2000	21238-0635		Discov num	S   788		Comp			Coord arcsec 2000	21 23 50.84 -06 35 02.2
Date first	1795		Date last	2018		Obs	59
Pa first	87		Pa last	93.2		P.A. Now (θ)	93.2°
Sep first	37.2		Sep last	58.1		Sep. Now (ρ)	58.1"
Mag pri	7.65		Mag sec	8.27		delta mag (ΔM)	0.62		Spectral class	F8 (yellow-white)
Pri motion ra	-129		Sec motion ra	-015
Pri motion dec	-004		Sec motion dec	-044
Notes	N L U (See Notes, Linear solution, Proper motion indicates non-physical)

rPM=0.936 This double is not physical.

Name	HD 203667		Constellation	Aquarius		SAO	145361		HIP	105641
Tycho2	5207-01103-1		Gaia DR2	6899007380609819008		HD	203667		GC	29948
DM	BD-07 5550		BD	BD-07 5549		Distance	60.72		Distance ly	198.07

discov_num	notes	refcode
S 788	B is BD-07@5550.
	Optical pair, based on study of relative motion of the components
	using the method of apparent motion parameters.	Kiy2008

refcode	metd	author	reference
Kiy2008	-	Kiyaeva, O.V., Kiselev, A.A. & Izmailov, I.S.	2008SvAL...32..405K
Kiy2008		SvAL 34, 405, 2008

idgroup	discov	author
1	S	South, J.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
21238-0635	S 788		2002	37	93	55.3	7.65	8.27	F8	NLD	212350.84-063502.2
21238-0635	S 788		2012	45	93	56.9	7.65	8.27	F8	NLD	212350.84-063502.2
21238-0635	S 788		2013	50	93	56.8	7.65	8.27	F8	NL U	212350.84-063502.2
21238-0635	S 788		2016	52	93	57.5	7.65	8.27	F8	NL U	212350.84-063502.2
21238-0635	S 788		2018	59	93	58.1	7.65	8.27	F8	NL U	212350.84-063502.2

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Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	23/08/24	Daedalus1	mean difficulty	separated	93		Primary is white and slightly brighter than the orange companion.

Show	date	username	difficulty	sep	sep_sigma	pa	pa_sigma	delta_mag	#	notes
Show	12/09/14	Robert		57.00	0.44	94.00			2
Show	23/08/24	Daedalus1	mean difficulty	58.31	0.09	93.00	0.00	0.53	12	Seeing: Pickering 8, excellent

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Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS