20106+3338 S 738 AB (HD 191812)

20^h 10^m 35.13^s +33° 38' 02.7" P.A. 106.00 sep 42.4 mag 7.76,8.43 Sp B9V dist. 301.2 pc (982.51 l.y.)

Coord 2000	20106+3338	Discov num	S 738	Comp	AB	Coord arcsec 2000	20 10 35.13 +33 38 02.7
Date first	1797	Date last	2021	Obs	44
Pa first	109	Pa last	106.2	P.A. Now (θ)	106.2°
Sep first	35.6	Sep last	42.37	Sep. Now (ρ)	42.37"
Mag pri	7.76	Mag sec	8.43	delta mag (ΔM)	0.67	Spectral class	B9V (blue-white)
Pri motion ra	-011	Sec motion ra	+001
Pri motion dec	-017	Sec motion dec	+001
Notes	N Z (See Notes, Parallax indicates components are physical)

rPM=1.068

This double is physical.

20106+3338 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 191812	69553	20 10 35 +33 38 03	S 738 AB	2021	44	106	42.4	7.76	8.43	0.67		<===
Show		69554	20 10 38 +33 37 51	STT 541 BC	2021	26	184	1.8	8.43	9.73	1.30

Triple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	HD 191812	Constellation	Cygnus	SAO	69553	HIP	99409
Tycho2	2675-03113-1	Gaia DR2	2055252734321284736	HD	191812	GC	28006
BD	BD+33 3778	Distance	301.2	Distance ly	982.51

WDS 20106+3338 S 738 AB (HD 191812) : NOTES

discov_num	notes	refcode
S 738	B is BD+33@3780.

REFERENCES

refcode	metd	author	reference
S__1826	Ma -	South, J.	1826RSPT..116....1S
S__1826		Phil. Trans. R. Soc., 116, Pt.1, 1826
S__1844A	Ma -	South, J.	1844QB43.S66.......
S__1844A		cited by Smyth (Cycle of Celestial Objects 2, 1844)
S__1852A	Ma -	South, J.	.
S__1852A		cited by Bishop (Bishop Obs. Astron. Observations 1852)
S__1880A	Ma -	South, J.	1880MNRAS..40..497B
S__1880A		cited by Burnham (MNRAS 40, 497, 1880)
S__1906A	Ma -	South, J.	1906MmRAS..56....1L
S__1906A		cited by Lewis (MemRAS 56, 1, 1906)
S__1906B	Ma -	South, J.	1906QB821.B972.....
S__1906B		cited in BDS (Burnham Double Star Cat., 1906)
S__1913A	Ma -	South, J.	1913QB811.B8.......
S__1913A		cited by Burnham (Carnegie Inst. Wash. #168, 1913)
S__1922A	Ma -	South, J.	1922AN....216...49R
S__1922A		cited by Rabe (AN 216, 49, 1922)
STTA		(O. Struve DD - Appendix list)	...................
Stt1864	Ma -	Struve, O.	1864MNRAS..24..149S
Stt1864		MNRAS 24, 149, 1864
Stt1866	orb -	Struve, O.	.
Stt1866		Bull. Imp. Acad. Sci. St. Petersburg, 1866
Stt1874	orb -	Struve, O.	.
Stt1874		Compte Rendus 79, 1467, 1874
Stt1875	orb -	Struve, O.	1875MNRAS..35..367S
Stt1875		MNRAS 35, 367, 1875
Stt1878	Ma -	Struve, O.	1878ObPul...9....1S
Stt1878		Pulkova Observations 9, 1, 1878
Stt1879A	Ma -	Struve, O.	1879Obs.....2..304G
Stt1879A		cited by Gledhill (Obs 2, 304, 1879)
Stt1879B	Ma -	Struve, O.	1879Obs.....3..245G
Stt1879B		cited by Gledhill (Obs 3, 245, 1879)
Stt1879C	Ma -	Struve, O.	1879Obs.....2..344G
Stt1879C		cited by Gledhill (Obs 2, 344, 1879)
Stt1880A	Ma -	Struve, O.	1880Obs.....2..605H
Stt1880A		cited by Hunt (Obs. 3, 605, 1880)
Stt1880B	Ma -	Struve, O.	1880Obs.....3..535G
Stt1880B		cited by Gledhill (Obs 3, 535, 1880)
Stt1880C	Ma -	Struve, O.	1880MNRAS..40..497B
Stt1880C		cited by Burnham (MNRAS 40, 497, 1880)
Stt1884A	Ma -	Struve, O.	1884AReg...22..216S
Stt1884A		cited by Sadler (Astr. Register 22, 216, 1884)
Stt1893a	Ma j	Struve, O.	1893ObPul..10....1S
Stt1893a		Pulkova Obs. Observations 10, 1, 1893
Stt1906A	Ma -	Struve, O.	1906MmRAS..56....1L
Stt1906A		cited by Lewis (MemRAS 56, 1, 1906)
Stt1906B	Ma j	Struve, O.	1906QB821.B972.....
Stt1906B		cited in BDS (Burnham Double Star Cat., 1906)
Stt1908A	Ma -	Struve, O.	1908MNRAS..68..465B
Stt1908A		cited by Barnard (MNRAS 68, 465, 1908)
Stt1913A	Ma -	Struve, O.	1913QB811.B8.......
Stt1913A		cited by Burnham (Carnegie Inst. Wash. #168, 1913)
Stt1914A	Ma -	Struve, O.	1914AN....198..107R
Stt1914A		cited by Rabe (AN 198, 107, 1914)
Stt1932A	Ma -	Struve, O.	1932QB821.A43......
Stt1932A		cited in ADS (Aitken Double Star Cat., 1932)

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20106+3338	S 738	AB	1998	36	106	42.1	7.76	8.43	B9V	NZD	201035.13+333802.7
20106+3338	S 738	AB	2008	37	106	42.0	7.76	8.43	B9V	NZD	201035.13+333802.7
20106+3338	S 738	AB	2012	39	104	41.8	7.76	8.43	B9V	NZD	201035.13+333802.7
20106+3338	S 738	AB	2017	41	106	42.4	7.76	8.43	B9V	NZ	201035.13+333802.7
20106+3338	S 738	AB	2019	43	106	42.6	7.76	8.43	B9V	NZ	201035.13+333802.7
20106+3338	S 738	AB	2021	44	106	42.4	7.76	8.43	B9V	NZ	201035.13+333802.7

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WDS 20106+3338 S 738 AB (HD 191812) : VISUAL OBSERVATIONS REPORTS

Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	22/09/16	daedalus1	mean difficulty	separated	106		Seeing: Pickering 4, poor. Measure: theta 106, rho 42.3 +/-0.075. Very nice pair. B has a very tight companion of its own, very nice to look at.

WDS 20106+3338 S 738 AB (HD 191812) : MEASURES

No records found.

WDS 20106+3338 (HD 191812) : VIRTUAL EYEPIECE

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WDS 20106+3338 (HD 191812) : ALADIN DSS IMAGE @

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

Error -22130
Not valid ID.

Error -22130
Not valid ID.
Error -27220
Not valid ID.