15232+3017 STF 1937 AB

Coord 2000	15232+3017		Discov num	STF1937		Comp	AB		Coord arcsec 2000	15 23 12.23 +30 17 17.7
Date first	1826		Date last	2020		Obs	1102
Pa first	35		Pa last	287.3		P.A. Now (θ)	340.7°
Sep first	1.1		Sep last	0.37		Sep. Now (ρ)	0.517"
Mag pri	5.64		Mag sec	5.95		delta mag (ΔM)	0.31		Spectral class	F8V+G0V (yellow-white/yellow)
Pri motion ra	+117		Sec motion ra	+117
Pri motion dec	-171		Sec motion dec	-171
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		64673	15 23 12 +30 17 18	STF 1937 AB	2020	1102	287	0.4	5.64	5.95	0.31	Y	<===
Show		64673	15 23 12 +30 17 18	STF 1937 AB,C	2016	10	358	75.1	4.98	13.35	8.37
Show	Eta CrB	64673	15 23 12 +30 17 18	STF 1937 AB,D	2016	10	40	217.9	4.98	11.00	6.02
Show		64673	15 23 12 +30 17 18	KIR 4 AB,E	2010	2	137	193.6	4.98	17.00	12.02

Quintuple system
6 estimated visually detectable stars in this system

Var name	NSV7054 CrB		Constellation	Corona Borealis		SAO	64673		HIP	75312
Tycho2	2563-01366-1		HD	137107		HR	5727		GC	20696
ADS	9617		GL	Gl 584A		BD	BD+30 2653		Bayer	Eta Coronae Borealis
Bayer name	Eta CrB		Flamsteed	2 Coronae Borealis		Flamsteed name	2 CrB		Distance	17.86
Distance ly	58.26		Bayer greek	η CrB

Period (P)	15204.9d (41.63y)	± 1.4	Periastron (T)	42612.9m (1975.547y)	± 3.4	Semi-major axis (a)	0.86226a	± 0.00033
Eccentricity (e)	0.27907	± 0.00026	Inclination (i)	58.084°	± 0.026	Longitude of periastron (ω)	39.885°	± 0.064
Node (Ω)	202.827°	± 0.024	Notes	n		Reference	Mut2010b
Equinox	2000		Last observation	2008		Grade	1	(1=Definitive, 9=Indet.)

label theta rho 2000 63.7 0.745 2001 70.1 0.690 2002 77.5 0.637 2003 86.2 0.589 2004 96.4 0.548 2005 107.9 0.519 2006 120.4 0.506 2007 133.2 0.508 2008 145.4 0.526 2009 156.6 0.554 2010 166.7 0.589 2011 175.6 0.623 2012 183.6 0.651 2013 191.1 0.667 2014 198.4 0.665 2015 206.0 0.643 2016 214.4 0.598 2017 224.6 0.534 2018 237.9 0.460 2019 256.1 0.392 2020 280.0 0.356 2021 305.4 0.371 2022 326.0 0.432 2023 340.7 0.517 2024 351.1 0.609 2025 358.7 0.699 2026 4.7 0.780 2027 9.6 0.851 2028 13.8 0.911 2029 17.5 0.959 2030 21.0 0.996		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

discov_num	notes	refcode
STF1937	eta CrB = 2 CrB.
	See Baize & Petit (1989) catalog of doubles with variable component.	Baz1989d
	Masses and bolometric magnitudes are derived for the two components of
	this system by Mason et al. (1999), based on assumed spectral types	Msn1999a
	Spectral types and masses of components assigned by ten Brummelaar et	TtB2000
	al., based on adaptive optics observations.
	and available parallaxes.
	Pourbaix gives combined solution for this resolved SB2, yielding	Pbx2000b
	orbital parallaxes and component masses.
	Combined spectroscopic/astrometric solution of SB2. Calculated masses
	1.243 +/- 0.054 and 1.100 +/- 0.039 Msun, distance 18.50 +/- 0.22 pc.	Mut2010b
	AB: H 1 16.	MEv2010
	AB: Malkov et al. (2012) derive dynamical, photometric, and
	spectroscopic masses 2.11 +/- 0.09, 2.24, and 2.14 Msun, respectively.	Mlk2012
	AB: SB2, P=41.628y	Tok2014d
KIR 4	AE. Data from 2MASS. Kirkpatrick et al. (2001) derive spectral types	Kir2001a
	G1V+G3V and L8V, determine is a physical pair, separation ~3600 au.
	Find that WDS C and D components of system are not physical.
STF1937	AB,C: Rectilinear solution by Hurowitz et al. (2014).	USN2014a

refcode	metd	author	reference
Baz1989d	-	Baize, P. & Petit, M.	1989A&AS...77..497B
Baz1989d		A&AS 77, 497, 1989
Kir2001a	E2 -	Kirkpatrick, J.D., Dahn, C.C., Monet, D.G., Reid, I.N., Gizis, J.E., Liebert, J.,	2001AJ....121.3235K
Kir2001a		& Burgasser, A.J.
Kir2001a		AJ 121, 3235, 2001
Kir2001a		(additional magnitude information and data to derive position angles extracted
Kir2001a		from ALADIN and 2MASS data)
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Mlk2012	not -	Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A.	2012A&A...546A..69M
Mlk2012		A&A 546, A69, 2012
Msn1999a	Su j	Mason, B.D., Douglass, G.G., & Hartkopf, W.I.	1999AJ....117.1023M
Msn1999a	+orb	AJ 117, 1023, 1999
Mut2010b	Kp -	Muterspaugh, M.W., Hartkopf, W.I., Lane. B.F., O'Connell, J., Williamson, M.,	2010AJ....140.1623M
Mut2010b		Kulkarni, S.R., Konacki, M., Burke, B.F., Colavita, M.M., Shao, M., &
Mut2010b		Wiktorowicz, S.J.
Mut2010b		AJ 140, 1623, 2010
Pbx2000b	orb -	Pourbaix, D.	2000A&AS..145..215P
Pbx2000b		A&AS 145, 215, 2000
Tok2014d	E2 -	Tokovinin, A.	2014AJ....147...86T
Tok2014d		AJ 147, 86, 2014
TtB2000	Ac j	ten Brummelaar, T.A., Mason, B.D., McAlister, H.A., Roberts, L.C., Jr.,	2000AJ....119.2403T
TtB2000		Turner, N.H., Hartkopf, W.I., & Bagnuolo, W.G., Jr.
TtB2000		AJ 119, 2403, 2000 (magnitude differences from Mt. Wilson AO)
USN2014a	lin -	Hurowitz, J.L., Hartkopf, W.I., & Mason, B.D.	2014IAUDS.182....1H
USN2014a		Inf. Circ. 182, 1, 2014

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
15232+3017	STF1937	AB	2007	1009	143	0.5	5.64	5.95	F8V+G0V	NOD	152312.23+301717.7
15232+3017	STF1937	AB	2008	1016	155	0.5	5.64	5.95	F8V+G0V	NOD	152312.23+301717.7
15232+3017	STF1937	AB	2009	1020	163	0.6	5.64	5.95	F8V+G0V	NOD	152312.23+301717.7
15232+3017	STF1937	AB	2010	1025	172	0.6	5.64	5.95	F8V+G0V	NOD	152312.23+301717.7
15232+3017	STF1937	AB	2011	1082	178	0.6	5.64	5.95	F8V G0V	NOD	152312.23+301717.7
15232+3017	STF1937	AB	2012	1083	184	0.6	5.64	5.95	G0V G0V	NOD	152312.23+301717.7
15232+3017	STF1937	AB	2013	1094	198	0.7	5.64	5.95	F8V G0V	NOD	152312.23+301717.7
15232+3017	STF1937	AB	2014	1070	208	0.7	5.64	5.95	F8V G0V	NOD	152312.23+301717.7
15232+3017	STF1937	AB	2015	1072	213	0.6	5.64	5.95	F8V+G0V	NO	152312.23+301717.7
15232+3017	STF1937	AB	2016	1076	217	0.6	5.64	5.95	F8V+G0V	NO	152312.23+301717.7
15232+3017	STF1937	AB	2017	1078	231	0.6	5.64	5.95	F8V+G0V	NO	152312.23+301717.7
15232+3017	STF1937	AB	2019	1090	264	0.4	5.64	5.95	F8V+G0V	NO	152312.23+301717.7
15232+3017	STF1937	AB	2020	1092	287	0.4	5.64	5.95	F8V+G0V	NO	152312.23+301717.7

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	21/06/01	Adam Long	difficut	separated	310	very interesting	Seeing good to very good, DRs circular and steady, able to get a steady hairline split at this mag. Noted increase in PA since last year, and reduction in size of spurious disc with this scope
Show	20/05/31	Adam Long	very difficult	oblunged	300	very interesting	Airy disc extended in PA direction, stretched egg shape. No separation or notching visible
Show	14/07/06	rbotero	difficut	separated	190	very interesting	Testing collimation

No records found.

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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

FoV: 30" 1' 5' 15' 30' 1° 2° 4° 5° 8° Limit: 2 3 4 5 10 15 20 25 30 50 100 Primaries only
Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation.
Show name coord_2000 discov# comp pa sep dist(') Show 15232+3017 STF1937 AB 287 0.4 Show 15232+3017 KIR 4 AB,E 137 193.6 Show 15232+3017 STF1937 AB,C 358 75.1 Show 15232+3017 STF1937 AB,D 40 217.9 Show 15238+3007 KZA 86 21 22.0 13 Show 15255+3020 KZA 88 115 50.4 30 Show 15228+3049 KZA 85 11 25.9 33 Show 15205+3021 TDS9495 73 0.6 35 Show 15239+3053 LDS4548 111 79.2 36 Show 15219+3052 KZA 84 AB 354 65.3 39 Show 15219+3052 KZA 84 AC 9 99.1 39 Show 15259+3031 KZA 89 244 41.4 39 Show 15212+3049 KZA 82 93 13.0 42 Show 15266+3008 WIS 286 240 876.7 45 Show 15202+3042 STF1935 289 8.6 46 Show 15216+3059 KZA 83 44 12.3 48 Show 15248+2934 KZA 87 359 11.7 48 Show 15215+2933 LDS4546 88 333.3 50 Show 15211+3102 KZA 81 174 8.0 53 Show 15269+2955 TDS9520 308 0.6 53 Show 15195+2952 KZA 78 18 42.6 55 Show 15275+3012 CVR1631 190 3.8 57 Show 15201+2937 ENG 53 343 144.1 57 Show 15191+3043 SLW1079 97 14.1 59 Show 15242+2920 CVR1627 53 3.5 60 Show 15191+3046 TDS9482 244 0.6 61 Show 15268+3102 TDS9517 105 0.6 65 Show 15232+2909 TDS9502 288 0.7 68 Show 15258+3117 UC 3001 48 5.8 69 Show 15274+3102 KZA 90 298 19.9 71 Show 15283+2943 KZA 91 215 30.9 74 Show 15174+3022 ARY 42 186 95.2 75 Show 15208+3129 LEP 74 326 999.9 78 Show 15195+3120 KZA 79 30 44.3 79 Show 15207+3133 KZA 80 54 25.2 83 Show 15295+2959 KPP 834 164 7.1 84 Show 15288+3101 A 1369 AB 316 4.2 85 Show 15288+3101 A 1369 AC 259 73.4 85 Show 15189+2915 LDS5168 193 62.7 85 Show 15283+2920 CVR 166 57 13.0 88 Show 15197+2859 LDS5170 270 31.2 91 Show 15246+3147 LEP 145 251 4.9 92 Show Nusakan 15278+2906 JEF 1 140 0.3 94 Show 15279+2902 TDS9523 52 1.2 98 Show 15177+2910 LDS5166 223 10.3 99 Show 15155+3049 BRT 251 10 5.2 104 Show 15268+2840 COU 484 83 0.3 108 Show 15203+3203 TOK 300 305 343.0 112 Show 15152+3103 TDS9466 5 0.5 113 Show 15186+2842 TDS9476 313 1.0 114 Show 15165+2905 KPP3289 305 0.7 114

	A	B	C	D
B	pa=289.8° sep=0.32"
C	pa=358.0° sep=75.10"	pa=358.2° sep=74.98"
D	pa=36.2° sep=205.93"	pa=36.3° sep=206.02"	pa=53.8° sep=154.06"
E	pa=140.7° sep=181.54"	pa=140.6° sep=181.81"	pa=151.4° sep=245.50"	pa=181.2° sep=306.63"

Coord arcsec 2000	152312.23+301717.7		Mag	5.64		Spectral class	F8V (yellow-white)		PmRA	117.00
PmDE	-171.0		SAO	64673		HIP	75312		Tycho2	2563-01366-1
HD	137107		HR	5727		GC	20696		ADS	9617
BD	BD+30 2653		Bayer	Eta Coronae Borealis		Bayer name	Eta CrB		Flamsteed	2 Coronae Borealis
Flamsteed name	2 CrB

Tycho2	2563-01366-1		Pflag	X		RAmdeg			DEmdeg
PmRA			PmDE			E RAmdeg			E DEmdeg
E pmRA			E pmDE			EpRAm			EpDEm
Num			Q RAmdeg			Q DEmdeg			Q pmRA
Q pmDE			BTmag	6.237		E BTmag	0.014		VTmag	5.641
E VTmag	0.009		Prox	10		TYC	T		HIP	75312
CCDM	A		RAdeg	230.80096167		DEdeg	30.28821222		EpRA 1990	1.64
EpDE 1990	1.80		E RAdeg	3.3		E DEdeg	3.1		Posflg	D
Corr	-0.4

SAO	64673		DelFlag			RA1950			PmRA1950	0.0104
DE1950			PmDE1950	-0.191		Vmag	5		SpType	G0
Double code			Source	70		CatNum	20696		DM	BD+30 2653
DMcomp			BDsup			HD	137107		M HD	9
GC	20696		RA1950rad	4.01922081		DE1950rad	0.53175502		PmRA2000	0.0106
PmDE2000	-0.187

Catalog	H		HIP	75312		Proxy	H		RAhms	15 23 12.23
DEdms	+30 17 17.7		Vmag	4.99		VarFlag			R Vmag	H
RAdeg	230.801		DEdeg	30.2882		AstroRef	A		Plx	53.7
CCDM	15233+3018		N CCDM	I		Nsys	1		Ncomp	2
MultFlag	C		Source			Qual	A		M HIP	AB
Theta	30		Rho	1.034		HD	137107		BD	BD+30 2653
CD			CP			Dm number	+30 2653		VIred	0.65
SpType	G2V		R SpType			Coord arcsec 2000	152312.23+301717.7

HIP	75312		Sn	17		So	3		Nc	2
RArad	4.02823638		DErad	0.5286295397		Plx	55.98		PmRA	116.83
PmDE	-171.37		E RArad	0.3		E DErad	0.44		E Plx	0.78
E pmRA	0.4		E pmDE	0.49		Hpmag	5.1117		E Hpmag	0.0004
SHp	0.006		VA	0		BV	0.577		E BV	0.004
VI	0.65

Coord arcsec 2000	152312.21+301717.8		Mag	5.95		Spectral class	G0V (yellow)		PmRA	117.00
PmDE	-171.0		Tycho2	2563-01366-2		HD	137108		HR	5728
ADS	9617		DM	BD+30 2653		Flamsteed	2 Coronae Borealis		Flamsteed name	2 CrB
Calc delta mag	0.31		Calc coord	yes

Tycho2	2563-01366-2		Pflag	X		RAmdeg			DEmdeg
PmRA			PmDE			E RAmdeg			E DEmdeg
E pmRA			E pmDE			EpRAm			EpDEm
Num			Q RAmdeg			Q DEmdeg			Q pmRA
Q pmDE			BTmag	6.610		E BTmag	0.014		VTmag	5.953
E VTmag	0.009		Prox	10		TYC	T		HIP	75312
CCDM	B		RAdeg	230.80112694		DEdeg	30.28846083		EpRA 1990	1.62
EpDE 1990	1.79		E RAdeg	3.3		E DEdeg	3.2		Posflg	D
Corr	-0.4

Coord arcsec 2000	152312.03+301832.8		Mag	13.35		PmRA	-10.00		PmDE	14.0
Calc delta mag	7.71		Calc coord	yes

Coord arcsec 2000	152321.62+302003.9		Mag	11		PmRA	-5.00		PmDE	1.0
Calc delta mag	5.36		Calc coord	yes

Coord arcsec 2000	152321.11+301457.3		Mag	17		Spectral class	L8 (very deep red)		PmRA	133.00
PmDE	-183.0		Calc delta mag	11.36		Calc coord	yes