Frankfurt Quasar Monitoring


PG 0804+761
Object data

  Cross-Identifications   FBS 0804+761, PGC 22946, 1ES 0804+761, 0804+761
  2E 0804.6+7611, QSO B0804+761, XSS J08117+7600
  2MASSi J0810586+760242, 1RXS J081059.0+760245
  1H 0758+762, RX J0810.9+7602, IRAS F08045+7611
  Equat. coordinates   RA  08 10 58.5     DE  +76 02 43     (J2000)
  Constellation   Camelopardalis
  Type   QSO
  Redshift   z=0.100
  Distance (2) (3)
  402 Mpc
  Total mag range (mv) (4)   13.7 - 14.7
  Catalog Magnitude (1)   14.71
  Absolute Magnitude (1)   -23.9 MB
  Light Travel-Time (2)   1.251 × 109 yrs
(1) Véron-Cetty & Véron 2006, A&A 455, 776
(2) NASA/IPAC Extragalactic Database
(3) Co-Moving Radial Distance
(4) Literature


Finding chart

0804+761_chart_fqm.jpg

Comparison stars

star B V Rc Ic (1)
1 14.469 (0.011) 13.911 (0.002)
13.577 (0.001)
13.262 (0.003)
2 13.984 (0.011)
13.557 (0.003)
13.293 (0.001) 13.042 (0.003)
3 13.707 (0.011)
13.033 (0.003)
12.658 (0.001)
12.320 (0.003)
4 14.763 (0.011)
14.042 (0.003)
13.643 (0.002)
13.289 (0.003)
5 12.774 (0.011)
11.763 (0.003)
11.219 (0.002) 10.711 (0.003)
6 12.601 (0.011)
11.980 (0.002)
11.622 (0.001) 11.288 (0.003)
comparison stars from Doroshenko et al. 2007, Ap, 50, 40
Colour chart
0804+761_color_fqm.jpg
Credit: DSS2  /  Size 14´× 14´ /  Chart by S. Karge

Light curve
0804+761_lc2212_fqm.jpg

Notes
PG 0804+761 is a bright quasar in Camelopardalis. The designation PG 0804+761 refers to the Palomar- Green Bright Quasar Survey (PG), where this object was discovered between 1976-1983 as a blue stellar object (see colour chart above). The blue-magnitude was given as B=15.15 m. Spectroscopic investigations revealed a Seyfert 1-spectrum. The redshift of z=0.100 corresponds to a distance of about 1.2×109 light-years. Due to its high absolute magnitude, this object was classified as a quasar. In 1984-1985, quasar PG 0804+761 was first identified as an X-ray source by the Einstein satellite.

PG 0804+761 is a small amplitude variable object with a total range of about 1 magnitude. Observations by the Frankfurt Quasar Monitoring programme have shown the quasar ranging between about 13.8 - 14.6 mag, an easy task for visual observers with telescopes of 8- to 12-inch of aperture and larger. For visual observers, PG 0804+761 remains a stellar object even with large apertures. CCD observers, as well as visual observers, shall use the comparison stars given above.
____________

You like to continue with another bright and optically variable source of quasi-stellar photons? So check out BL Lac object S5 0716+71, which is located some 5.8° SE at a distance of 3×109 light-years.

Only 3.3° NW of quasar 
PG 0804+761, observers find the bright 11-mag galaxy NGC 2655
at a distance of about 63 million light-years, which also harbours an AGN at its centre. Two other bright galaxies can be found NE of quasar PG 0804+761: The first one is 11.1-mag NGC 2366, a nice spiral galaxy some 4.7° NE. The other one is NGC 2146, 6.5° NE. This is a highly disturbed SB-spiral due to gravitational interaction with 13.5-mag NGC 2146A, some 18´ NE of NGC 2146. This galaxy collision is taking place at a distance of about 45 million light-years.


Literature
Boroson, T.A., Green, R.F. 1992, ApJS, 80, 109; The Emission-Line Properties of Low-Redshift Quasi-Stellar Objects.
Elvis, M., Wilkes, B.J., McDowell, J.C. 1994, ApJS, 95, 1; Atlas of quasar energy distributions.
Giveon, U., Maoz, D., et al. 1999, MNRAS, 306, 637G; Long-term optical variability properties of the Palomar-Green
     quasars.
Green, R., Schmidt, M., Liebert, J. 1986, ApJS, 61, 305; The Palomar Green Catalogue of Ultraviolet-Excess Stellar
     Objects.
Richards, G.T., Yanny, B., et al. 1997, PASP, 109, 39; Quasar Photometry with the SDSS Monitor Telescope.
Schmidt, M., Green, R. 1983, ApJ, 269, 352; Quasar Evolution derived from the Palomar Bright Quasar Survey and
     other complete Quasar Survey.
Steinicke, W.; Katalog heller Quasare und BL Lacertae Objekte; Umkirch 1998.
Tananbaum, H., Avni, Y., Green, R.F., et al. 1986, ApJ, 305, 57; X-ray observations of the bright quasar survey.
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.



Link:
 
Hamburg Quasar Monitoring


© Stefan Karge  /  last obs. 2022-12-15






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