20426+1244 STF 2718 AC

20^h 42^m 33.47^s +12° 43' 41.9" P.A. 346.00 sep 167.2 mag 8.28,9.02 Sp F5 dist. 144.51 pc (471.39 l.y.)

Coord 2000	20426+1244	Discov num	STF2718	Comp	AC	Coord arcsec 2000	20 42 33.47 +12 43 41.9
Date first	1889	Date last	2015	Obs	20
Pa first	346	Pa last	346.2	P.A. Now (θ)	346.2°
Sep first	167.0	Sep last	167.211	Sep. Now (ρ)	167.211"
Mag pri	8.28	Mag sec	9.02	delta mag (ΔM)	0.74	Spectral class	F5 (yellow-white)
Pri motion ra	-004	Sec motion ra	+012
Pri motion dec	-023	Sec motion dec	-012
Notes

rPM=0.832

This double is not physical.

20426+1244 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 197312	106409	20 42 33 +12 43 42	STF 2718 AB	2020	85	87	8.5	8.28	8.39	0.11
Show		106409	20 42 33 +12 43 42	STF 2718 AC	2015	20	346	167.2	8.28	9.02	0.74		<===
Show		106410	20 42 34 +12 43 42	STF 2718 BC	2015	16	346	167.3	8.39	9.02	0.63

Triple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Delphinus	SAO	106409	HIP	102206	Tycho2	1097-02966-1
Gaia DR2	1755224014276610432	HD	197312	BD	BD+12 4440	Distance	144.51
Distance ly	471.39

WDS 20426+1244 STF 2718 AC : NOTES

No records found.

REFERENCES

refcode	metd	author	reference
STFA		(F. Struve DD - Appendix list #1)	...................
STFB		(F. Struve DD - Appendix list #2)	...................
StF1833A	Ma -	Struve, F.G.W.	1833MmRAS...5...13H
StF1833A	+Mc	cited by Herschel (MemRAS 5, 13, 1833)
StF1833B	Ma -	Struve, F.G.W.	1833AN.....10..389B
StF1833B		cited by Bessel (AN 10, 389, 1833)
StF1837	Ma -	Struve, F.G.W.	1837AN.....14...249
StF1837		Stellarum duplicium et multiplicium mensurae micrometricae...
StF1837		(Dorpat, Academiae scientiarum caesareae petropolitaneifique), 1837
StF1844A	Ma -	Struve, F.G.W.	1844QB43.S66.......
StF1844A		cited by Smyth (Cycle of Celestial Objects 2, 1844)
StF1852A	Ma -	Struve, F.G.W.	.
StF1852A		cited by Bishop (Bishop Obs. Astron. Observations 1852)
StF1865A	Ma -	Struve, F.G.W.	1865AN.....64...81E
StF1865A		cited by Engelmann (AN 64, 81, #1518, 1865)
StF1875A	Ma -	Struve, F.G.W.	1875AN.....85..323D
StF1875A		cited by Doberck, 1875 (see Dob1875b,f,g,h)
StF1878	Ma -	Struve, F.G.W.	.
StF1878		Pulkova Observations 9, 1878
StF1878B	Ma -	Struve, F.G.W.	1878Obs.....2..239G
StF1878B		cited by Gledhill (Obs 2, 239, 1878)
StF1880A	Ma -	Struve, F.G.W.	1880Obs.....3..535G
StF1880A		cited by Gledhill (Obs 3, 535, 1880)
StF1906A	Ma -	Struve, F.G.W.	1906QB821.B972.....
StF1906A		cited in BDS (Burnham Double Star Cat.), 1906
StF1906B	Ma -	Struve, F.G.W.	1906MmRAS..56....1L
StF1906B		cited by Lewis (MemRAS 56, 1, 1906)
StF1922A	Ma -	Struve, F.G.W.	1922AN....216...49R
StF1922A		cited by Rabe (AN 216, 49, 1922)
StF1932A	Ma -	Struve, F.G.W.	1932QB821.A43......
StF1932A		cited in ADS (Aitken Double Star Cat.), 1932
StF2002	- -	Weis, J.
StF2002		F. G. W. Struve's double stars : the Dorpat catalogue; the Pulkovo catalogue
StF2002		USNO Library : QB 821 .S8 W49 2002
StF2022	- -	email note from Jan Weis: 6 July 2022
StF9999	Ma -	Struve, F.G.W.	...................
StF9999		Unpublished, manuscript or reference not found.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20426+1244	STF2718	AC	2004	10	347	165.1	8.28	9.02		D	204233.47+124341.9
20426+1244	STF2718	AC	2009	13	345	166.6	8.28	9.02		D	204233.47+124341.9
20426+1244	STF2718	AC	2015	16	346	167.2	8.28	9.02	F5		204233.47+124341.9

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

WDS 20426+1244 STF 2718 AC : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 20426+1244 STF 2718 AC : MEASURES

No records found.

WDS 20426+1244 : 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 20426+1244 : ALADIN DSS IMAGE @ 20^h 42^m 33.47^s +12° 43' 41.9"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 20426+1244 STF 2718 AC : 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		20426+1244	STF2718	AB	87	8.5	1
Show		20426+1244	STF2718	AC	346	167.2	1
Show		20426+1244	STF2718	BC	346	167.3	1
Show		20428+1244	BPM2234		331	93.5	4
Show		20426+1300	GWP2988		23	19.1	17
Show		20418+1231	STF2715		2	12.4	18
Show		20439+1255	J 1888		158	10.0	22
Show		20440+1256	DAM 218		342	5.7	25
Show		20441+1258	J 1889		10	4.6	26
Show		20405+1240	HEI 278		135	3.4	30
Show		20440+1225	HJ 1566	AB	16	16.9	31
Show		20440+1225	HJ 1566	AC	331	32.4	31
Show		20420+1212	BPM2231		330	108.9	33
Show		20402+1248	BPM2223		290	95.3	36
Show		20450+1244	BU 64	AB	174	0.7	36
Show		20450+1244	STTA209	AC	155	97.2	36
Show		20450+1244	BU 64	AD	117	64.3	36
Show		20450+1244	D 32	CD	15	60.8	37
Show		20446+1312	TDS1098		279	0.9	41
Show		20442+1209	BPM2240		148	55.1	42
Show		20449+1219	B 2910	Aa,Ab	52	0.1	43
Show		20449+1219	STF2723	AB	140	1.0	43
Show		20449+1219	BU 1492	AC	30	37.0	43
Show		20410+1206	HEI 587		36	1.2	44
Show		20413+1327	BPM2228	BC	141	118.1	47
Show		20444+1205	A 875		208	2.5	48
Show		20413+1327	BPM2227	AB	173	68.5	48
Show		20457+1302	WFC 258		284	11.7	50
Show		20438+1330	BPM2238		50	66.9	50
Show		20414+1157	TDT2472		309	0.5	50
Show		20396+1310	J 912		125	1.8	50
Show		20391+1243	BPM2218		252	64.4	51
Show		20460+1235	KPP 477		52	4.5	52
Show		20426+1335	HEI 279	BC	211	4.1	52
Show		20426+1335	HEI 279	AB	115	25.1	52
Show		20429+1152	BPM2235		142	114.9	52
Show		20419+1150	HEI 588		293	2.3	54
Show		20408+1332	GWP2982		31	88.8	55
Show		20446+1154	BPM2251		51	84.7	58
Show		20421+1341	BPM2232		346	68.4	59
Show		20446+1333	YSC 242	AB	157	1.5	59
Show		20471+1257	BPM2265		51	16.1	68
Show		20391+1329	TDT2453	Aa,Ab	117	0.5	68
Show		20391+1329	UC 4242	AB	105	45.3	68
Show		20404+1143	UC 4253		315	19.7	69
Show		20466+1334	GWP2996		157	54.2	78
Show		20372+1250	A 1680		295	3.8	79
Show		20373+1230	UC 4235		132	44.9	79
Show		20372+1224	BPM2209		213	61.9	82
Show		20418+1404	J 2575		305	1.7	83
Show		20467+1343	BPM2262		331	74.6	85

WDS 20426+1244 : COMPONENTS

	A	B
B	pa=88.6° sep=8.49"
C	pa=346.5° sep=166.98"	pa=343.7° sep=168.97"

20426+1244 A

Name	HD 197312	Coord arcsec 2000	204233.47+124341.9	Mag	8.28	Spectral class	F5 (yellow-white)
PmRA	-4.00	PmDE	-23.0	SAO	106409	HIP	102206
Tycho2	1097-02966-1	HD	197312	GC	28855	BD	BD+12 4440

Tycho2

Tycho2	1097-02966-1	Pflag		RAmdeg	310.63947915	DEmdeg	12.72824013
PmRA	1.2	PmDE	-24.1	E RAmdeg	8	E DEmdeg	8
E pmRA	1.4	E pmDE	1.4	EpRAm	1991.31	EpDEm	1991.22
Num	5	Q RAmdeg	2.4	Q DEmdeg	1.4	Q pmRA	2.5
Q pmDE	1.3	BTmag	8.697	E BTmag	0.018	VTmag	8.284
E VTmag	0.014	Prox	85	TYC	T	HIP	102206
CCDM	A	RAdeg	310.63947611	DEdeg	12.72829611	EpRA 1990	1.69
EpDE 1990	1.65	E RAdeg	7.7	E DEdeg	7.5	Posflg
Corr	0.0

SAO

SAO	106409	DelFlag		RA1950		PmRA1950	-0.0011
DE1950		PmDE1950	-0.011	Vmag	8	SpType	F5
Double code		Source	70	CatNum	28855	DM	BD+12 4440
DMcomp		BDsup		HD	197312	M HD	0
GC	28855	RA1950rad	5.41132451	DE1950rad	0.21901381	PmRA2000	-0.001
PmDE2000	-0.014

Hipparcos

Catalog	H	HIP	102206	Proxy	H	RAhms	20 42 33.47
DEdms	+12 43 41.9	Vmag	7.57	VarFlag		R Vmag	H
RAdeg	310.639	DEdeg	12.7283	AstroRef	A	Plx	7.7
CCDM	20425+1245	N CCDM	I	Nsys	1	Ncomp	2
MultFlag	C	Source		Qual	A	M HIP	AB
Theta	87	Rho	8.483	HD	197312	BD	BD+12 4440
CD		CP		Dm number	+12 4440	VIred	0.53
SpType	F5+...	R SpType		Coord arcsec 2000	204233.47+124341.9

Hipparcos 2

HIP	102206	Sn	15	So	3	Nc	2
RArad	5.4216816783	DErad	0.2221507488	Plx	6.92	PmRA	-10.98
PmDE	-23.87	E RArad	1.5	E DErad	1.14	E Plx	2.3
E pmRA	2.37	E pmDE	1.4	Hpmag	7.6624	E Hpmag	0.0017
SHp	0.013	VA	0	BV	0.425	E BV	0.016
VI	0.49

20426+1244 B

Coord arcsec 2000	204234.05+124342.1	Coord calc	204234.05+124342.1	Mag	8.39	Spectral class	F5 (yellow-white)
PmRA	-7.00	PmDE	-26.0	SAO	106410	Tycho2	1097-00010-1
HD	197313	GC	28856	DM	BD+12 4441	Calc delta mag	0.11

Tycho2

Tycho2	1097-00010-1	Pflag		RAmdeg	310.64186711	DEmdeg	12.72835520
PmRA	-9.5	PmDE	-28.0	E RAmdeg	8	E DEmdeg	8
E pmRA	1.4	E pmDE	1.3	EpRAm	1991.24	EpDEm	1991.18
Num	6	Q RAmdeg	2.0	Q DEmdeg	1.0	Q pmRA	2.1
Q pmDE	1.1	BTmag	8.881	E BTmag	0.019	VTmag	8.394
E VTmag	0.015	Prox	85	TYC	T	HIP	102206
CCDM	B	RAdeg	310.64189000	DEdeg	12.72842000	EpRA 1990	1.67
EpDE 1990	1.68	E RAdeg	8.4	E DEdeg	8.2	Posflg
Corr	-0.1

SAO

SAO	106410	DelFlag		RA1950		PmRA1950	-0.0024
DE1950		PmDE1950	-0.018	Vmag	8	SpType	F5
Double code		Source	70	CatNum	28856	DM	BD+12 4441
DMcomp		BDsup		HD	197313	M HD	0
GC	28856	RA1950rad	5.41136445	DE1950rad	0.2190145	PmRA2000	-0.0023
PmDE2000	-0.021

20426+1244 C

Coord arcsec 2000	204230.81+124624.3		Mag	9.02		PmRA	12.00		PmDE	-12.0
Tycho2	1097-00215-1		Calc delta mag	0.74		Calc coord	yes

Tycho2

Tycho2	1097-00215-1	Pflag		RAmdeg	310.62757019	DEmdeg	12.77330158
PmRA	11.1	PmDE	-12.7	E RAmdeg	12	E DEmdeg	14
E pmRA	1.3	E pmDE	1.2	EpRAm	1990.33	EpDEm	1988.88
Num	7	Q RAmdeg	0.8	Q DEmdeg	0.4	Q pmRA	0.8
Q pmDE	0.5	BTmag	11.189	E BTmag	0.060	VTmag	9.024
E VTmag	0.017	Prox	999	TYC	T	HIP
CCDM		RAdeg	310.62754389	DEdeg	12.77333139	EpRA 1990	1.77
EpDE 1990	1.54	E RAdeg	11.7	E DEdeg	15.4	Posflg
Corr	-0.1