Eastern upper facies

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Virgo star

The star name, located in Virgo, is the second bright star in Virgo.

Chinese name: Eastern upper facies
Foreign name: γ Vir / γ Virginis

Alias: Porrima and Arich
Classification: Virgo A star of

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Stellar data

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Eastern upper facies (γ Vir/γ Virginia) Yes Virgo It is a star of Porrima and Arich .

Dongshangxiang is a Conjoint star , including two Apparent magnitude Similar, 3.48 and 3.50 respectively, Spectrum type Is F0V, Orbital period 168.93. In the early 1990s, it was a pair of conjoined stars easy for amateur astronomers to observe, but because of the reduction of angular distance, it now requires a large telescope to observe. They were last Periapsis The time is 1836. By 2020, the distance will be separated to the extent that small telescopes can observe. The synthetic luminosity of this system is 2.9, and sunlight Is 39 Light year 。

The position of the eastern upper phase is close to Ecliptic , so it will be Moon Masking , sometimes planet Masking (very rare).

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The following table shows the apparent distance and relative position angle of these two stars: the first three columns show the prediction based on the orbit in 1937, the second two columns show the year 2006, and the next three columns are the observation reports of the observatory organized by Hanwell.

Standard Orbit Prediction from 1937			Docobo orbit prediction from 2006		Observations from 2003 to 2005
year	distance	Position angle	distance	Position angle	date	distance	Position angle
one thousand nine hundred and ninety-five	2.5"	two hundred and eighty	2,25"	two hundred and seventy-seven point six	-	-	-
two thousand	1.8"	two hundred and sixty-seven	1.50"	two hundred and sixty point nine
two thousand and two	1.5"	two hundred and fifty-nine	1.13"	two hundred and forty-seven point five
two thousand and three	-	-	0.92"	two hundred and thirty-six point six	2003 Dec.	0.6 arcsec.	219°
two thousand and four	1.2"	two hundred and forty-six	0.68"	two hundred and eighteen point four	2004 Dec.	0.4 arcsec.	177°
two thousand and five	-	-	0.44"	one hundred and seventy-nine point eight	2005 April	0.27-0.29"	161±0.6°
two thousand and six	0.8"	two hundred and twenty-one	0.41"	one hundred and three point five	-	-	-
two thousand and eight	0.4"	one hundred and twenty-six	0.93"	forty-one
two thousand and ten	0.9"	forty-four	1.39"	twenty-three point six

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