| Frankfurt Quasar Monitoring |
| PG 0804+761 |
| 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 |
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) |
| 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. |
| 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 |
