|Frankfurt Quasar Monitoring|
1440+356, IRAS 14400+3539, PGC 52510
2MASSi J1442074+352622, EUVE J1442+35.4
FIRST J144207.4+352623, RX J1442.1+3526
1AXG J144207+3526, 2XMM J144207.4+352622
GALEXASC J144207.57+352623.7, 1440+356
SDSS J144207.47+352622.9, 1H 1429+370
|Equat. coordinates||RA 14 42 07.5 DE +35 26 23 (J2000)|
|Total mag range (mv) (4)||14.3 - 14.8|
|Catalog Magnitude (1)||14.58|
|Absolute Magnitude (1)||-23.4 MB|
|Light Travel-Time (2)||1.009 × 109 yrs|
|D||15.736 (0.193)||15.159 (0.118)|
478 for short)
is a bright quasar in Bootes, about 3.5° SE of Gamma Bootis. MRK
478 was discovered in 1972 by the UV-Continuum-Survey run by
Markarian et al. (MRK) at the Astrophysical Observatory in
Main goal was the
spectroscopic search for "blue" galaxies with excessive UV-emission.
MRK 478 was detected as a very compact, star-like object. As a blue
star-like object it was also detected by both the
Palomar-Green Bright Quasar Survey (PG) and the Extreme Ultraviolet
Explorer (EUVE). The quasar host is a spiral galaxy with an apparent
30"×20". The host itself shows clear signs of disturbance, detectible
as faint shells or arms. The very
bright nucleus emits a Narrow-Line Seyfert 1-spectrum (NLS1), very
similar to that found with I Zw 1.
MRK 478 is a low amplitude variable object with a total range of less than 1 magnitude. Visual observers need at least an 8- to 10-inch telescope to glimpse this stellar object. Using large aperture telescopes, the quasar becomes either star-like or a star-like object, enveloped by a very diffuse and small halo. With very large aperture and high power, observers may recognize a slightly bluish hue of the bright star-like nucleus, a result of the UV-excess of this active galactic nucleus.
CCD observers, as well as visual observers, shall use the comparison stars given above.
Finding MRK 478 is an easy task due to its position 3.5° SE of Gamma Bootis. A little south of Gamma Bootis, a chain of stars of mag 6 and mag 7 directly point to the quasar. Only 1.5° NE, we find the faint galaxy NGC 5695, also known as MRK 686, an active galaxy with S2-spectrum. As with MRK 478, this AGN was also found by the UV-Continuum-Survey mentioned above.
Observers who like to track down some more very old quasi-stellar photons may turn to quasar PG 1411+442, a bright 14-mag object at a distance of about 1×109 light-years, some 10° NW of MRK 478.
Another bright quasi-stellar object is PKS 1424+240, a variable 14-mag BL Lac object, located about 12° SSW of MRK 478.
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