21145+1000 STF 2777 AB,C (Del Equ)

21^h 14^m 28.81^s +10° 00' 25.1" P.A. 6.00 sep 76.5 mag 4.54,10.17 Sp F6V+F6V dist. 18.49 pc (60.31 l.y.)

Coord 2000	21145+1000	Discov num	STF2777	Comp	AB,C	Coord arcsec 2000	21 14 28.81 +10 00 25.1
Date first	1781	Date last	2016	Obs	91
Pa first	78	Pa last	5.8	P.A. Now (θ)	5.8°
Sep first	19.5	Sep last	76.5	Sep. Now (ρ)	76.5"
Mag pri	4.54	Mag sec	10.17	delta mag (ΔM)	5.63	Spectral class	F6V+F6V (yellow-white/yellow-white)
Pri motion ra	+042	Sec motion ra	-015
Pri motion dec	-303	Sec motion dec	-007
Notes	N L U (See Notes, Linear solution, Proper motion indicates non-physical)

rPM=0.985

This double is not physical.

21145+1000 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		126643	21 14 29 +10 00 25	STT 535 AB	2021	521	7	0.1	5.19	5.52	0.33	Y
Show	Del Equ	126643	21 14 29 +10 00 25	STF 2777 AB,C	2016	91	6	76.5	4.54	10.17	5.63		<===

Triple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	Del Equ	Constellation	Equuleus	SAO	126643	HIP	104858
Tycho2	1109-02583-1	Gaia DR2	1743871762876699776	HD	202275	HR	8123
GC	29697	ADS	14773	GL	Gl 822A	BD	BD+09 4746
Bayer	Delta Equulei	Bayer name	Del Equ	Flamsteed	7 Equulei	Flamsteed name	7 Equ
Distance	18.49	Distance ly	60.31	Bayer greek	δ Equ

WDS 21145+1000 STF 2777 AB,C (Del Equ) : NOTES

discov_num	notes	refcode
STT 535	del Equ = 7 Equ.
	Spectral types and masses of components assigned by ten Brummelaar et
	al., based on adaptive optics observations.	TtB2000
	This is an example of a system whose earlier long period, low-
	eccentricity orbit has been supplanted by a high-eccentricity orbit
	of half P due to correct quadrant determination.
	The motion causes double spectral lines over part of the orbit, but
	the components are indistinguishable in the spectrum as well as
	visually. The RV curve gives the elements T, e, and the longitude of
	periastron somewhat in variance with those of the visual orbit; cf.
	Dworetsky et al. (1971).	Dwo1971
	Pourbaix gives combined solution for this resolved SB2, yielding	Pbx2000b
	orbital parallaxes and component masses.
	Arenou (2000) gives combined solution of astrometric orbits and DSBs.	Are2000
	Paper includes masses and distances.
	Muterspaugh et al. (2008) combine PHASES astrometry with speckle and	Mut2008
	radial velocity data to derive an orbit for this nearby pair. The
	derived parallax is 54.41 +/- 0.14 mas (distance 18.379 +/- 0.048 pc).
	Masses of A and B components are nearly identical, at 1.192 +/- 0.012
	and 1.187 +/- 0.012 Msun.
	AB: Malkov et al. (2012) derive dynamical, photometric, and
	spectroscopic masses 2.43 +/- 0.34, 2.45, and 2.33 Msun, respectively.	Mlk2012
STF2777	AB,C: Optical pair, based on study of relative motion of the
	components using the method of apparent motion parameters.	Kiy2008
	AB,C: H 4 37.	MEv2010

REFERENCES

refcode	metd	author	reference
Are2000	orb -	Arenou, F., Halbwachs, J.-L., Mayor, M., & Udry, S.	2000IAUS..200P.135A
Are2000		IAU Symp. 200, 135, 2000
Dwo1971	-	Dworetsky, M.M., Popper, D.M., & Dearborn, D.S.	1971PASP...83..207D
Dwo1971		PASP 83, 207, 1971
Kiy2008	-	Kiyaeva, O.V., Kiselev, A.A. & Izmailov, I.S.	2008SvAL...32..405K
Kiy2008		SvAL 34, 405, 2008
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
Mut2008	Kp j	Muterspaugh, M.W., Lane, B.F., Fekel, F.C., Konacki, M., Burke, B.F.,	2008AJ....135..766M
Mut2008	+orb	Kulkarni, S.R., Colavita, M.M., Shao, M., & Wiktorowicz, S.J.
Mut2008		AJ 135, 766, 2008 (all observations supplanted by Mut2010a)	2010AJ....140.1579M
Pbx2000b	orb -	Pourbaix, D.	2000A&AS..145..215P
Pbx2000b		A&AS 145, 215, 2000
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)

DISCOVERER

idgroup	discov	author
1	STF	Struve, F.G.W.
34	STT	Struve, O.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
21145+1000	STF2777	AB,C	2009	87	6	74.1	4.54	10.17	F6V+F6V	NL	211428.81+100025.1
21145+1000	STF2777	AB,C	2011	89	6	74.3	4.54	10.17	F6V F6V	NL	211428.81+100025.1
21145+1000	STF2777	AB,C	2016	91	6	76.5	4.54	10.17	F6V+F6V	NL U	211428.81+100025.1

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

WDS 21145+1000 STF 2777 AB,C (Del Equ) : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 21145+1000 STF 2777 AB,C (Del Equ) : MEASURES

No records found.

WDS 21145+1000 (Del Equ) : VIRTUAL EYEPIECE

Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.

WDS 21145+1000 (Del Equ) : ALADIN DSS IMAGE @ 21^h 14^m 28.81^s +10° 00' 25.1"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 21145+1000 STF 2777 AB,C (Del Equ) : NEIGHBORHOODS

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		21145+1000	STT 535	AB	7	0.1
Show		21145+1000	STF2777	AB,C	6	76.5
Show		21131+1028	BU 1501		210	1.0	34
Show		21165+0936	BRT3228		259	6.2	39
Show		21138+1045	HJ 278		263	22.9	46
Show		21165+0924	LAF 64	AB	29	5.5	48
Show		21165+0924	LAF 64	AC	168	12.4	48
Show		21179+0952	HJ 3019		309	15.0	51
Show		21121+1038	ENG 81	AB	353	184.7	52
Show		21121+1038	BUP 226	BC	30	24.7	54
Show		21147+0907	CVR 890		3	29.1	55
Show		21181+0942	HJ 3020		295	25.8	58
Show		21110+0933	STF2765	AB	82	2.9	59
Show		21110+0933	STF2765	AC	167	44.2	59
Show		21180+0934	HJ 3021		237	23.8	59
Show		21181+1027	UC 4435		259	50.5	60
Show		21103+1008	KNT 5	AB	248	0.6	62
Show		21103+1008	BU 71	AC	359	59.9	62
Show		21103+1008	STFA 54	AD	152	335.2	62
Show		21140+1106	AG 415	AB	23	15.9	66
Show		21140+1106	TOB 316	BC	87	21.1	66
Show		21107+1038	LEP 172		11	4.7	68
Show		21123+1105	BPMA251		305	252.8	73
Show		21130+1109	GWP3042		113	25.6	73
Show		21161+0851	CVR 891		33	8.6	74
Show		21137+0846	UC 4412	AB	201	8.6	76
Show		21137+0846	RAO 449	Aa,Ab	322	0.4	76
Show		21137+1115	BPM2345		10	52.4	76
Show		21101+0919	GWP3039		61	73.1	78
Show		21197+0931	STF2786		188	2.8	82
Show		21201+0947	UC 4444	AB	170	74.7	84
Show		21181+0854	UC 4436		34	37.6	86
Show		21187+0857	LDS4877		123	89.5	88
Show		21110+1113	BPM2339		123	58.7	89
Show		21086+0938	J 159		246	4.0	90
Show		21084+1008	BU 9010	AB	313	10.1	91
Show		21084+1008	BU 9010	AC	211	32.6	91
Show		21202+1018	HJ 933		239	17.0	91
Show		21164+1128	CVR 892		185	7.0	92
Show		21152+0829	SKF1869		302	67.9	93
Show		21142+1135	BPM2350		144	29.1	95
Show		21088+1047	WAK 12		180	4.3	99
Show		21139+1140	BPM2346		245	17.4	101
Show		21116+1133	LDS4869		267	203.8	102
Show		21214+1020	A 617		45	0.0	104
Show		21106+1126	BPM2337		97	68.2	104
Show		21143+1145	BPM2351		255	115.3	105
Show		21198+1108	GRV 446		157	60.2	106
Show		21088+1113	BPM2334		311	75.2	112
Show		21186+1134	BU 163	AB	257	1.0	112
Show		21186+1134	BU 163	AC	252	29.7	112

WDS 21145+1000 : COMPONENTS

	A	B
B	pa=6.9° sep=0.08"
C	pa=5.7° sep=76.49"	pa=5.7° sep=76.41"

21145+1000 A

Coord arcsec 2000	211428.81+100025.1	Mag	5.19	Spectral class	F6V (yellow-white)	PmRA	40.00
PmDE	-304.0	SAO	126643	HIP	104858	Tycho2	1109-02583-1
HD	202275	HR	8123	GC	29697	BD	BD+09 4746
Bayer	Delta Equulei	Bayer name	Del	Flamsteed	7 Equulei	Flamsteed name	7 Equ

Tycho2

Tycho2	1109-02583-1	Pflag		RAmdeg	318.62005755	DEmdeg	10.00698080
PmRA	39.7	PmDE	-304.2	E RAmdeg	3	E DEmdeg	4
E pmRA	1.3	E pmDE	1.2	EpRAm	1991.52	EpDEm	1991.39
Num	13	Q RAmdeg	1.0	Q DEmdeg	1.0	Q pmRA	1.1
Q pmDE	1.0	BTmag	5.087	E BTmag	0.014	VTmag	4.544
E VTmag	0.009	Prox	689	TYC	T	HIP	104858
CCDM	AB	RAdeg	318.61996389	DEdeg	10.00769306	EpRA 1990	1.63
EpDE 1990	1.57	E RAdeg	3.4	E DEdeg	3.6	Posflg	P
Corr	-0.2

SAO

SAO	126643	DelFlag		RA1950		PmRA1950	0.0031
DE1950		PmDE1950	-0.301	Vmag	4.6	SpType	F5
Double code		Source	70	CatNum	29697	DM	BD+09 4746
DMcomp		BDsup		HD	202275	M HD	0
GC	29697	RA1950rad	5.55034137	DE1950rad	0.17110023	PmRA2000	0.0033
PmDE2000	-0.305

Hipparcos

Catalog	H	HIP	104858	Proxy	H	RAhms	21 14 28.79
DEdms	+10 00 27.8	Vmag	4.47	VarFlag		R Vmag	G
RAdeg	318.62	DEdeg	10.0077	AstroRef	*	Plx	54.11
CCDM	21145+1001	N CCDM	I	Nsys	1	Ncomp	2
MultFlag	C	Source	S	Qual	A	M HIP	AB
Theta	0	Rho	0.167	HD	202275	BD	BD+09 4746
CD		CP		Dm number	+09 4746	VIred	0.57
SpType	F5V+...	R SpType		Coord arcsec 2000	211428.79+100027.8

Hipparcos 2

HIP	104858	Sn	55	So	3	Nc	2
RArad	5.5609673499	DErad	0.174667643	Plx	54.09	PmRA	42.39
PmDE	-304.19	E RArad	0.54	E DErad	0.45	E Plx	0.66
E pmRA	0.68	E pmDE	0.42	Hpmag	4.5928	E Hpmag	0.0006
SHp	0.005	VA	0	BV	0.529	E BV	0.015
VI	0.57

21145+1000 B

Coord arcsec 2000	211428.81+100025.2		Mag	5.52		Spectral class	F6V (yellow-white)		Calc delta mag	0.33
Calc coord	yes

21145+1000 C

Coord arcsec 2000	211429.33+100141.2		Mag	10.17		Spectral class	F6V (yellow-white)		PmRA	-15.00
PmDE	-7.0		Calc delta mag	4.98		Calc coord	yes