23307+0515 STF 3019 (HD 221272)

Coord 2000	23307+0515		Discov num	STF3019		Comp			Coord arcsec 2000	23 30 40.76 +05 14 58.0
Date first	1824		Date last	2016		Obs	73
Pa first	186		Pa last	184.7		P.A. Now (θ)	184.7°
Sep first	11.7		Sep last	10.69		Sep. Now (ρ)	10.69"
Mag pri	7.77		Mag sec	8.37		delta mag (ΔM)	0.6		Spectral class	F0IV+A3m (yellow-white/white)
Pri motion ra	-013		Sec motion ra	-013
Pri motion dec	-007		Sec motion dec	-007
Notes	N V (See Notes, Proper motion indicates physical)

This double is physical.

Name	HD 221272		Constellation	Pisces		SAO	128216		HIP	116035
Tycho2	0591-01742-1		Gaia DR2	2660434860632206720		HD	221272		GC	32691
BD	BD+04 5019		Distance	1818.18		Distance ly	5930.9

discov_num	notes	refcode
STF3019	H N 137.	MEv2010

refcode	metd	author	reference
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)

idgroup	discov	author
1	STF	Struve, F.G.W.

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
23307+0515	STF3019		2003	58	185	10.8	7.77	8.37	A8III	YD	233040.76+051458.0
23307+0515	STF3019		2012	62	186	10.7	7.77	8.37	A8III	NYD	233040.76+051458.0
23307+0515	STF3019		2014	65	183	11.1	7.77	8.37	A8III	NYD	233040.76+051458.0
23307+0515	STF3019		2016	68	185	10.7	7.77	8.37	F0IV+A3m	NY	233040.76+051458.0

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Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	23/10/03	Daedalus1	mean difficulty	separated	185		Both stars are white. Primary is easily brighter. I suspect that the companion's magnitude is greater than listed.

Show	date	username	difficulty	sep	sep_sigma	pa	pa_sigma	delta_mag	#	notes
Show	23/10/03	Daedalus1	very difficult	10.44	0.10	185.00	0.00	0.60	12	Seeing: Pickering 7, good. This was difficult to measure; the companion was so dim that needed averted vision to keep it from being washed out in the dim eyepiece illumination. I should not have had so much trouble with an 8.34 magnitude star.

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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