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File: /var/www/vhosts/stelledoppie.it/web/include/dbi.inc.php
Executing script: /var/www/vhosts/stelledoppie.it/web/index2.php
Query: INSERT INTO sessioni (id,valori,datains) VALUES ('08a88794362cc086283e3fa4452f0b36a8327211','a:2:{s:11:\"REMOTE_ADDR\";s:14:\"18.222.119.148\";s:5:\"trace\";a:1:{i:0;a:3:{s:4:\"page\";s:11:\"/index2.php\";s:4:\"date\";i:1714783925;s:3:\"GET\";a:2:{s:4:\"menu\";s:2:\"21\";s:8:\"iddoppia\";s:5:\"96924\";}}}}',NOW())
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WDS 21516+1950 HJ 947 AB (HD 207840)

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21516+1950
HJ 947 AB
HD 207840

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Binocular doubles
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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

21516+1950 HJ 947 AB (HD 207840)

21^h 51^m 34.24^s +19° 49' 35.9" P.A. 98.00 sep 18.9 mag 5.78,11.39 Sp B8III dist. 161.55 pc (526.98 l.y.)

Coord 2000	21516+1950		Discov num	HJ 947		Comp	AB		Coord arcsec 2000	21 51 34.24 +19 49 35.9
Date first	1827		Date last	2012		Obs	18
Pa first	93		Pa last	98		P.A. Now (θ)	98°
Sep first	15.0		Sep last	18.9		Sep. Now (ρ)	18.9"
Mag pri	5.78		Mag sec	11.39		delta mag (ΔM)	5.61		Spectral class	B8III (blue-white)
Pri motion ra	+021		Sec motion ra	+007
Pri motion dec	+013		Sec motion dec	+001
Notes	N (See Notes)

rPM=0.747

Nature of this double is uncertain.

21516+1950 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 207840	107445	21 51 34 +19 49 36	HJ 947 AB	2012	18	98	18.9	5.78	11.39	5.61		<===
Show		107445	21 51 34 +19 49 36	HJ 947 AC	2012	11	310	24.3	5.78	13.51	7.73
Show			21 51 36 +19 49 34	HJ 947 BC	2015	14	297	41.1	11.39	13.51	2.12

Triple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Name	HD 207840		Constellation	Pegasus		SAO	107445		HIP	107887
Tycho2	1674-00925-1		Gaia DR2	1780482957460615040		HD	207840		HR	8348
GC	30594		ADS	15383		BD	BD+19 4797		Distance	161.55
Distance ly	526.98