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Contains:  16 Tau, 17 Tau, 18 Tau, 19 q Tau, 20 Tau, 21 Tau, 22 Tau, 23 Tau, 24 Tau, 25 eta Tau, 26 Tau, 27 Tau, 28 Tau, Alcyone, Asterope, Atlas, Celaeno, Electra, IC349, M45, Maia, Maia nebula, Merope, Merope nebula, NGC 1432, NGC 1435, NGC1435, Pleiades, Pleione, Sterope II, Taygeta, The star 18Tau, The star Atlas (27Tau), The star Celaeno (16Tau), The star Electra (17Tau), The star Merope (23Tau), The star Pleione (28Tau), The star Sterope I (21Tau), The star Taygeta (19Tau), The star ηTau
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Pleiades aka The Seven Sisters/Subaru/Cr42/M45/Mel22 (c), 



    
        

            Ram Samudrala
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Pleiades aka The Seven Sisters/Subaru/Cr42/M45/Mel22 (c)

Technical card


Dates:Aug. 2, 2019Aug. 11, 2019

Frames:
Baader Planetarium UV/IR Cut: 90x120" (gain: 0.50) -15C bin 1x1
Baader Planetarium UV/IR Cut: 240x15" (gain: 0.50) -15C bin 1x1

Integration: 4.0 hours

Darks: ~135

Avg. Moon age: 6.34 days

Avg. Moon phase: 44.13%

Bortle Dark-Sky Scale: 3.00

Mean SQM: 1.20

Mean FWHM: 3.50

Temperature: 15.00


Astrometry.net job: 2862490

RA center: 3h 46' 45"

DEC center: +24° 7' 17"

Pixel scale: 1.690 arcsec/pixel

Orientation: -8.729 degrees

Field radius: 1.687 degrees


Resolution: 5994x3970

Locations: Ram Samudrala, Youngstown, NY, United States

Data source: Backyard

Description

The Pleiades (M45) is an open star cluster and corresponding reflection nebulae in the constellation Taurus. It is the first astronomical object I recall in my memory: I remember looking at it through a small courtyard from our first floor home when I was a child---it sparked my fascination with science and astronomy and getting to know the night sky, as well as the associated mythologies different human cultures have created around these objects. The Pleiades was the easiest object to remember, not only due to its brightness but also its distinctive twinkle and the challenge of distinguishing the stars within it.

The nine brightest stars in the Pleiades cluster are named after the Seven Sisters in Greek mythology, along with their parents: Alcyone, Atlas (father), Electra, Maia, Merope, Taygeta, Pleione (mother), Celaeno, and Sterope/Asterope. The cluster however contains more than one thousand confirmed members, fourteen of which can apparently be distinguished by the naked eye. Unlike the typical emission nebula I image, all the light is due to reflection of blue light from the hot young stars on the dust in the interstellar medium - there is no ionising radiation and therefore it is not a narrowband composition but reflects largely what the sensor has captured. The Maia and Merope nebulae (NGC1432 and NGC1435) are the major ones in this star cluster.

The dust responsible for the nebulosity is not uniformly distributed, and is concentrated in two layers. These layers may have been formed by deceleration due to radiation pressure as the dust has moved towards the stars, making them appear as though waves of hair are flowing the stars and giving us a sight to behold through powerful telescopes or ordinary imaging equipment. If you look closely you can see the waviness of the dust lanes observable to the very edges of the blue nebulae.

The 110 million year old cluster is about eight light years across and about 136 parsecs away, making it one of the nearest star clusters to us. It is expected to disperse within the next 250 million years.

Comments

Author

ramdom
Ram Samudrala
License: Attribution Creative Commons
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Revisions

  • Final
    Pleiades aka The Seven Sisters/Subaru/Cr42/M45/Mel22 (c), 



    
        

            Ram Samudrala
    Original
  • Pleiades aka The Seven Sisters/Subaru/Cr42/M45/Mel22 (c), 



    
        

            Ram Samudrala
    B
  • Pleiades aka The Seven Sisters/Subaru/Cr42/M45/Mel22 (c), 



    
        

            Ram Samudrala
    C

B

Description: Different processing pathway.

C

Description: Minus 22 minutes of data relative to A & B.

Sky plot

Sky plot

Histogram

Pleiades aka The Seven Sisters/Subaru/Cr42/M45/Mel22 (c), 



    
        

            Ram Samudrala

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