|Frankfurt Quasar Monitoring|
B0624+6907, QSO J0630+6905, 0624+691|
RX J06300+6904, 2MASS J06300250+6905039
|Equat. coordinates||RA 06 30 02.6 DE +69 05 03 (J2000)|
|Redshift (1) (2)||
Distance (2) (3)
|Total mag range (mv) (4) (5)||14.1 - 14.5|
|Catalog Magnitude (1)||14.16|
|Absolute Magnitude (1)||-27.2 MB|
|Light Travel-Time (2)||3.898 × 109 yrs|
|3||15.038 (0.123)||14.381 (0.078)|
||15.117 (0.130)||14.545 (0.069)|
||15.528 (0.221)||14.636 (0.075)|
||15.770 (0.180)||15.035 (0.080)|
bright quasar in Camelopardalis. Its position lies about 2.1° W of 43
Cam, and 1° E of L Cam (HD 42818). HS 0624+6907 was discovered in 1989
during Hamburg Quasar Survey (HS). This survey was carried out by the
80-cm Schmidt-Telescope at Calar Alto
Observatory, equipped with an objective prism. The newly found
point source was immediately identified as a
quasar by follow-up spectral analysis. With an
apparent brightness of
v=14.2 m, this quasar was the second brightest (!) ever
discovered in the optical band pass. Together with quasar KUV 18217+6419 (which was
equally bright at the time of discovery), HS 0624+6907 was
only surpassed by famous quasar 3C
Quasar HS 0624+6907 is a small amplitude variable object ranging between 14.1 and 14.5 mag. Due to its brightness, this quasar is an easy task for visual observers with telescopes of 8- to 10-inch of aperture. The object appears stellar even with large apertures. This comes without surprise, considering the quasars large cosmological distance of nearly 4×109 light-years.
Without a go-to mount, tracking down quasar HS 0624+6907 is a little tricky, as it lies in a region lack of bright stars for easy starhopping.
CCD observers, as well as visual observers, shall use the comparison stars given above.
Only 7´N of quasar HS 0624+6907, you find a faint but nice double star, consisting of an 11.72-mag primary and a 12.15-mag companion, separated by 14.7" (see the double on top of the finding chart). Both components share the same proper motion. In addition, this double is a good orientation mark to locate the quasar position in the eyepiece or CCD frame.
When observing HS 0624+6907, do not forget to visit bright spiral galaxy NGC 2403, only 7° SE. NGC:2403 is a member of the M 81-galaxy group.
In case you look for another bright interesting blazar I recommend S5 0716+71, a bright and violently variable BL Lac object, about 5° NE.
|Bade, W., Witt, P. 1989, SuW 5/89, 283; Automatische Suche nach Quasaren.|
Bowen, D.V., Osmer, S.J., Blades, J.C., et al. 1994, AJ, 107, 461; Hubble Space Telescope faint object
spectrograph QSO absorption snapshot survey (ABSNA).
Groote, D., Heber, U., Jordan, S. 1989, A&A, 223, L1; Discovery of Two Bright Low-Redshift Quasars by the
Hamburg Quasar Survey.
Karge, S.; Helle Quasare für 8- bis 10-Zoll Teleskope. Ein Beobachtungsführer zur visuellen Beobachtung von
Quasaren und BL Lacertae Objekten; Frankfurt 2005.
Reimers, D., Hopp, U., et al. 1995, A&A, 303, 449; Multiwavelength observations of the bright QSO HS 0624+6907.
Steinicke, W.; Beobachtungsliste für helle Quasare; Umkirch 1999.
Véron-Cetty, M.-P., Véron, P. 2001, A&A 374, 92; A Catalogue of Quasars and Active Nuclei: 10th edition.
Véron-Cetty, M.-P., Véron, P. 2003, A&A 412, 399; A Catalogue of Quasars and Active Nuclei: 11th edition.
Véron-Cetty, M.-P., Véron, P. 2006, A&A 455, 776; A Catalogue of Quasars and Active Nuclei: 12th edition.
Véron-Cetty, M.-P., Véron, P. 2010, A&A 518, 10; A Catalogue of Quasars and Active Nuclei: 13th edition.
Wenzel, K. 2001, Interstellarum 16, 53; QdQ: HS 0624+6907.
Hamburg Quasar Monitoring