|Frankfurt Quasar Monitoring|
|Cross-Identifications|| RGB J0809+523, QSO B0806+524, 1E 0806+524
SDSS J080949.18+521858.2, 3EG J0809+5218
RX J0809.8+5218, 1RXS J080949.2+521855
1ES 0806+52.4, FIRST J080949.1+521858
87GB 080601.8+522753, GB6 J0809+5218
|Equat. coordinates||RA 08 09 49.2 DE +52 18 58 (J2000)|
| Distance (2) (3)
|Total mag range (mv) (4) (5)||14.8 - 16.3|
|Catalog Magnitude (1)||15.3|
|Absolute Magnitude (1)||-24.3 MB|
|Light Travel-Time (2)||1.687 × 109 yrs|
||14.22 (0.04)||13.86 (0.04)|
Credit: SDSS / Size 3´× 3´
galaxy of 1ES 0806+524 as a bright
starlike nucleus surrounded by a
diffuse extended circular halo
(app. diam. 0.23´× 0.21´)
Credit: Scarpa et al. (1999) / Size 18.6"×18.6"This image from Hubble Space Telescope
shows the well-resolved host galaxy.
(The arclike structure 1.9" south of the bright
nucleus possibly is a bright elliptical shell or the
remnant of a previous gravitational interaction)
0806+524 is a variable BL Lac object in north-eastern Lynx,
close to the star 27 Lyn. The
designation 1ES 0806+524 refers to the Einstein
Slew Survey, where this object was cataloged as an X-ray source
in the early 1990s. Initially, 1ES
0806+524 was discovered as a radio source in 1987 with
the 91-m Green Bank radio telescope. Radio
interferometry revealed a short northbound
jet. The host galaxy of 1ES
identified as an elliptical galaxy with an apparent diameter of 0.23´×
0.21´. A remarkable arc-like
structure, about 2" south of the nucleus, was found by the Hubble Space
Telescope, which might be a bright elliptical shell or the
remnant of a previous gravitational interaction. The
first redshift of z=0.138
was measured in the late 1990s, based on weak absorption lines. Earlier
attempts revealed only a featureless spectrum. Besides the radio and
0806+524 was also identified as a gamma source by EGRET
on board of Compton Gamma Ray Observatory in 1999/2000.|
1ES 0806+524 is located in north-eastern Lynx, only 50´N of the 4.8-mag star 27 Lyn. A nice observing object lies 7.5° NW, well suited for small telescopes. That is double star 19 Lyn (=STF1062), consisting of a 5.6-mag primary and a 6.5-mag companion (both type B stars), separated by 14.8".
Three nearby galaxies might also attract the observers interest. First turn the telescope 6.8° E to meet NGC 2681, a bright 11.1-mag face-on SB0a spiral, with a very bright stellar nucleus. Some 4° further to the east (11.3° E of 0806+524) there is NGC 2841, a large and bright 10.1-mag lense-shaped spiral.
A very special object is NGC 2685, 9.2° NE in UMa, also dubbed the Helix- or Pancake-Galaxy. NGC 2685 is a 12.1-mag Polar-Ring Galaxy, the result of an ongoing galaxy merger (Arp 336), the brightest of its class.
Another bright extragalactic variable is waiting for the dedicated observer. S5 0716+71 is a violently variable BL Lac object, located 19.7° N at a distance of about 3×109 light-years.
And finally, sweep the telescope 18.8° to the SSE to find another bright quasar. PG 0844+349 is a bright 13-mag to 14-mag object at a distance of about 0.8×109 light-years.
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Sloan Digital Sky Survey