Deep Sky Object in Spring
QSO 3C273 (Quasar in Virgo)


Date & Time: Apr 29 2017, from 24:50 to 25:12 JST(+0900)
Composed 8 shots with 3 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080)
Device Size...20×20mm
Sensitivity...ISO6400, White Balance...Daylight




QSO 3C273 / Quasar
R.A.12h 29m 6.9s (2000.0)
Dec.+02° 03' 07" (2000.0)
Apparent Sizeless than 20"
Red Shift0.158
Magnitude12.8
Distanceabout 2.0 billion light yrs. *
Group of Galaxies-
Other IDsPGC41121
* Rough value calculated under supposing
the Hubble constant H0=70 km s-1 Mpc-1
I'd like to show you probably one of most distant objects can be captured with amateur telescopes. This field shows you around north west of gamma Vir, Porrima, which is one of most beautiful double stars in spring skies. An arrow indicates a deep-deep sky object of the "Quasar (QSO)". This word is an abbreviation of the "Quasi-stellar object". Almost all of quasars show the red shift over 90% of light velocity; this fact tells us that quasars must be over some billions light years away. The quasar "3C273" was discovered at the first time and has a visual magnitude of 12.8, it's the brightest in all quasars. Distance from the Galaxy is estimated about 2.5 billion light years.
It's considered that quasars are emitting gigantic energy because they're extremely bright in spite of their stupendous distance. Their quantities of emitting energy is imagined about some thousands or some ten thousands times of that of whole of our Galaxy. Some astronomers have proposed that they may be "eggs" of very active galaxies formed in the early of universe's history. But we don't know what they really are yet, one of greatest mysteries in contemporary astronomy.

⇒ Display the spectral profile of 3C273
(in new window)




Leo II

Virgo Cluster


Copyright(c) 2017 by Naoyuki Kurita, All rights reserved.
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