Nanhe III

Canis Minor star

Nanhe III (also known as Canis Minor α， Abbreviated as α CMi), is a Apparent magnitude 0.34 star, located at Canis Minor 。 It is Stellar brightness The 9th brightest star in the list is also the brightest star in the constellation,^[1] However, according to modern observation methods, Nanhe Sanshi is a conjoint star system composed of two stars Primary star Nanhe 3A, one white F5 IV – V Main sequence star ， companion by Nanhe III B , one DQZ type White dwarf 。^[2]

By European Space Agency Emitting Ibaku satellite^[2] The measured data is calculated Conjoint star System distance solar system About 11.46 light years (3.51 Second gap ）Therefore, it is also a nearby star.^[3]

Chinese name: Nanhe III
Foreign name: Procyon
Alias: Procyon
Classification: fixed star
Discoverer: unknown
Discovery time: prehistoric
Apparent magnitude: About 0.34
Absolute magnitude: About 2.67
Right ascension: 7:39:18.1

Declination: +5°13′29″
Distance from the ground: About 11.46 light years
Semimajor axis: 1.18"
Eccentricity: zero point three six
Rail inclination: 31.9 degrees
Catalogue number: HIP 37279
Spectrum type: F5 IV-V
Constellations: Canis Minor
Star official: Nanhe (Jingsu, Zhuque)

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Photo of Gemini

In China, its Nanhe Xingguan, located in the southern rosefinch, is named Nanhe San. In the west, its name derives from the Greek πρ ο κ ον (prok ú on). The original meaning of Procyon in the South River is "in front of the dog", because it is located in the northeast of Sirius, 15-20 minutes before the big dog - Sirius, from due east by north horizon It rises, and then sinks into the west 2-3 hours later than Sirius. In ancient times, the Egyptians worshipped Sirius very much, because when it appeared on the eastern horizon at dawn, it was every year the Nile The flood season, and the South River Three, which appeared before Sirius, became the first omen of the arrival of this season.

Nanhe Sanya Winter Triangle And the other two are Canis Major Sirius and Orion Of Betelgeuse 。 Nanhesan is also adjacent solar system And the Earth's stars, in the Closer Star Table, are listed 11.44 light-years (3.5 Second gap ）(13th in distance). Like Sirius, it is Konductra — Primary star (Nanhe 3A) There is also a dim White dwarf As companion (Nanhe IIIB), only 1.11 light years (0.34 seconds) away from another Luyten's star (ranking 22nd).

Introduction to Stars

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Canis Minor

Nanhe 3 is a beautiful star with an apparent star magnitude of 0.38, Absolute magnitude 2.64, about 11.44 light years from the earth, slightly farther than Sirius, is an F5IV Subgiant 。 Its luminosity is 6.9 times that of the sun, surface temperature It is about 6510 ℃. Compared with Sirius, it is yellowish.

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constellation	Canis Minor
Star official	Nanhe (Jingsu, Zhuque)
Right ascension	07h 39m 18.1/17.7s
Declination	+05° 13' 29/20"
Apparent magnitude (V)	0.34/10.7
characteristic	-
Spectral classification	F5 IV-V/DA
U − B color index	−0.01
B − V color index	0.40/0.0
Variant type	?
Radial speed (R v )	−3.2 km/s
Self acting (μ)	Right ascension: − 716.57mas/yr Declination: − 1034.58mas/yr
Parallax (π)	286.05± 0.81mas
distance	11.4 ± 0.03ly 　　(3.496 ± 0.01pc)
Absolute magnitude (M V )	2.65/13.04
quality	1.50/0.60 M ☉
radius	1.86/0.02 R ☉
brightness	7.73/0.00055 L ☉
temperature	6,650/9,700K
Amount of metal	110% Sun
Age	1.7 × 10 years
Visual conjoint orbit	-
companion	Nanhe III B
Period	40.82 years
Semi major axis (a)	1.18"
Eccentricity (e)	zero point three six
Rail inclination (i)	31.9°
Intersection point (Ω)	284.8°
Near star epoch (T)	one thousand nine hundred and sixty-seven point eight six
Other naming	-
Canis Minor alpha, Canis Minor 10, GCTP1805.00,HR2943,BD+05°1739, LHS233,GJ280,HIP37279, GC10277,ADS6251, CCDM07393+0514
Reference database	-
SIMBAD	data

Observation history

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In 1896, astronomers found that there was also a yellow and white companion , called HD 61563, its Apparent magnitude It's 10.8, etc, Absolute magnitude 13.1, etc., its cycle is about 40 years. Like the companion star of Sirius, the companion star of Nanhesan is also in the late life White dwarf 。 It is only twice the size of the earth, but its mass is Solar mass Half of.

classification

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Nanhe 3A

Nanhe 3A is a yellow white star, its brightness is 7.5 times brighter than the sun, and its spectrum is F5IV-V. In fact, because he is also brighter than other stars in this type of spectrum, some people think that he should be Subgiant That is to say, he has just finished the fusion of hydrogen into helium nuclear fusion React and begin to expand. Therefore, he will not only start "reddening", but will expand to 80-150 times its diameter and become a red or orange star. This process may take 10 million to 100 million years. When the sun is dying, it will go through a similar process.

Nanhe 3A

In late June 2004, Canada The MOST satellite telescope of the Optical observation Confirm his change in luminosity. However, no change in intensity was observed during the two month observation period. These research results are astronomical physical scientist Start to doubt some Helioseismology The principle of Star formation There are also doubts about his theory.

Nanhe III B

Nanhe III B It's a dark one White dwarf , the distance from Nanhe 3A is about 16 Astronomical unit , almost Uranus Distance to the sun.

Numerical data

Apparent magnitude: 10.7

Absolute magnitude: 13.0

Luminosity: 5/10000 of the sun

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