21041-0549 STF 2745 AB (12 Aqr)

Coord 2000	21041-0549		Discov num	STF2745		Comp	AB		Coord arcsec 2000	21 04 04.71 -05 49 23.0
Date first	1825		Date last	2021		Obs	126
Pa first	192		Pa last	197.5		P.A. Now (θ)	197.5°
Sep first	3.2		Sep last	2.439		Sep. Now (ρ)	2.439"
Mag pri	5.80		Mag sec	7.50		delta mag (ΔM)	1.7		Spectral class	G4III (yellow)
Pri motion ra	+013		Sec motion ra	+013
Pri motion dec	-009		Sec motion dec	-009
Notes	N (See Notes)

Nature of this double is uncertain.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		145064	21 04 05 -05 49 23	MCA 66 Aa,Ab	2021	15	54	0.3	5.90	8.30	2.40
Show	12 Aqr	145064	21 04 05 -05 49 23	STF 2745 AB	2021	126	198	2.4	5.80	7.50	1.70		<===

Triple system
2 estimated visually detectable stars in this system

Name	12 Aqr		Constellation	Aquarius		SAO	145064		HIP	103981
Tycho2	5204-01584-1		Gaia DR2	6910418142353215104		HD	200496		HR	8058
GC	29416		ADS	14592		BD	BD-06 5664		Flamsteed	12 Aquarii
Flamsteed name	12 Aqr		Distance	153.85		Distance ly	501.86

discov_num	notes	refcode
MCA 66	Aa,Ab: 12 Aqr.
	A measure on 1980.7257 was incorrectly attributed to HR 8059 by
	McAlister et al. (1983); it actually belongs to ADS 13944.	McA1983

refcode	metd	author	reference
McA1983	Sc j	McAlister, H.A., Hendry, E.M., Hartkopf, W.I., Campbell, B.G., & Fekel, F.C.	1983ApJS...51..309M
McA1983		ApJS 51, 309, 1983

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
21041-0549	STF2745	AB	2006	121	201	2.4	5.80	7.50		D	210404.71-054923.0
21041-0549	STF2745	AB	2008	122	196	2.5	5.80	7.50		D	210404.71-054923.0
21041-0549	STF2745	AB	2009	125	197	2.5	5.80	7.50		N D	210404.71-054923.0
21041-0549	STF2745	AB	2011	126	196	2.5	5.80	7.50		N D	210404.71-054923.0
21041-0549	STF2745	AB	2012	127	196	2.3	5.80	7.50		N D	210404.71-054923.0
21041-0549	STF2745	AB	2015	122	197	2.5	5.80	7.50	G4III	N D	210404.71-054923.0
21041-0549	STF2745	AB	2017	125	197	2.5	5.80	7.50	G4III	N	210404.71-054923.0
21041-0549	STF2745	AB	2021	126	198	2.4	5.80	7.50	G4III	N	210404.71-054923.0

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

Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	22/09/02	daedalus1	mean difficulty	separated	197		Seeing: Pickering 6, good. Measures: theta 197, rho 2.54 +/- 0.144. Very nice pair, primary much brighter than companion.

Show	date	username	difficulty	sep	sep_sigma	pa	pa_sigma	delta_mag	#	notes
Show	22/09/02	Daedalus1	mean difficulty	2.54	0.14	197.00	0.00	1.70	12	Pickering 6, good.

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