Frankfurt Quasar Monitoring


KUV 18217+6419
Object data

  Cross-Identifications  1ES 1821+643, E 1821+643, PG 1821+643
  IRAS 18216+6418, H 1821+643, 1821+643
  1RXS J182157.4+642051, EXO 1821.6+6419
  7C 182140.90+641929.00, 1H 1820+643
  SWIFT J1822.1+6421, QSO B1821+6419
  RGB J1821+643, RX J1821.8+6419
  PLCKESZ G094.01+27.42, 2E 4066
  Equat. coordinates   RA  18 21 57.2     DE  +64 20 36     (J2000)
  Constellation   Draco
  Type   QSO
  Redshift   z=0.297
  Distance (2) (3)   1141 Mpc
  Total mag range (mv) (4) (5)   13.3 - 14.2
  Catalog Magnitude (1)   14.24
  Absolute Magnitude (1)   -27.1 MB
  Light Travel-Time (2)   3.269 × 109 yrs
(1) Véron-Cetty & Véron 2006, A&A 455, 776
(2) NASA/IPAC Extragalactic Database
(3) Co-Moving Radial Distance
(4) Frankfurt Quasar Monitoring
(5) Literature

Finding chart
1821+643_chart_fqm.jpg

Comparison stars

star B V Rc Ic (1)
1 16.344 (0.036)
15.458 (0.019)
14.941 (0.008)
14.493 (0.015)
3 15.629 (0.022)
14.432 (0.013)
13.721 (0.007)
13.138 (0.011)
4 16.520 (0.036)
15.576 (0.019)
15.046 (0.011)
14.560 (0.017)
6 14.149 (0.018)
13.314 (0.011)
12.839 (0.011)
12.418 (0.009)
7 11.851 (0.019)
11.372 (0.013)
11.060 (0.006)
10.779 (0.010)
8 13.357 (0.019)
12.799 (0.012)
12.450 (0.006)
12.146 (0.009)
E 13.160 (0.019)
12.524 (0.012)
12.141 (0.005)
11.807 (0.009)
comparison stars from Doroshenko et al. 2005, Ap, 48, 304

Light curve
1821+643_lc2011_fqm.jpg


Quasar KUV 18217+6419 and planetary PK 94+27.1

This 10´× 10´ section from POSS shows quasar KUV 18217+6419 (marked)
and planetary nebula PK 94+27.1 = K 1-16  (apparent diameter 115").
The central star DS Dra appears striking blue (15m.09 var.).

1821+643_color_fqm.png
Credit: DSS2 / Chart by S. Karge

KUV 18217+6419 (QSO) and CL 1821+643 (GxCl)

This image from WIYN Telescope shows quasar KUV 18217+6419 (arrow), together
with several faint galaxies of galaxy cluster
CL 1821+643. Planetary nebula
PK 94+27.1 appears as a diffuse and irregular patch of light NW of the QSO.

1821+643_wiyn.jpg
Credit: T. M. Tripp (Princeton) et al. WIYN Observatory, NOAO, NSF; & HST, NASA  /  image N up, E left

Notes
KUV 18217+6419 is a bright quasar in Draco and is one of the brightest objects of its class. This stellar object was discovered in 1977 as an X-ray source by the HEAO1 satellite (H). With the same property it was observed again in 1980 by the Einstein satellite (E) with higher precision. In 1981, a stellar object of v=14.1 m was found as the optical counterpart. Follow-up spectroscopic investigations revealed a Seyfert 1-spectrum, which led to the quasar classification. Just one year earlier, this quasar was found independently in the optical (v=14.24 m) by the KISO-Survey (KUV), searching for UV-bright stellar sources.
The host galaxy of quasar KUV 18217+6419 is a giant elliptical galaxy, also classified as a Hyperluminous Infrared Galaxy (HyLIRG). The quasar host resides at the centre of galaxy cluster CL 1821+643 (see image above). Quasar KUV 18217+6419 is one of the most luminous radio-quiet quasars in the area of z<0.5, and the second brightest quasar of all at z>0.1.

Quasar KUV 18217+6419 is a small amplitude variable object with a total range of only about one magnitude (13.3 - 14.2 m). CCD observers, as well as visual observers, shall use the comparison stars given above. Visual observers need at least an 8- to 10-inch telescope to glimpse this stellar object.

____________

Quasar KUV 18217+6419 is located only 1´SE of planetary nebula PK 94+27.1 (= K1-16), which can only be observed with large aperture telescopes under very dark skies. The bluish central star is a lot easier to detect at v=15.04 (GCVS) / v=15.055 (Doroshenko 2005) / 14.9 m (GSC) (see image above). It is listed with the designation DS Dra and is considered to be slightly variable by 0.02 mag.
Another interesting deep sky object can be found some 3° to the south. There we find the showpiece planetary NGC 6543, also known as the "Cat´s Eye Nebula". NGC 6543 is rich in details and one of the brightest objects of its class.

Observers who like to continue testing their skills
may turn to BL Lac object 3C 371, a bright 14-mag object at a distance of about 0.6×109 light-years, 5.7° NNW of KUV 18217+6419.


Literature
Beyvers, G., Beyvers, C. 2001, SuW 9/01, 773; Quasare im Sechs- und im Achtzöller.
de Grijp, M.H.K., Miley, G.K., Lub, J. 1987, A&AS, 70, 95; Warm IRAS Sources - A Catalogue of AGN Candidates from
     the Point Source Catalogue (PSC).
Doroshenko, V.T, et al. 2005, Ap, 48, 304; BVRI CCD-Photometry of Comparison Stars in the Neighborhoods of
     Galaxies with Active Nuclei. II.
Fried, J.W. 1998, A&A, 331, 73; Extended Emission-Line Gas in the High Luminosity, Low Redshift QSO E1821+643.
Hall, P.B., Ellingson, E., Green, R.F. 1997, AJ, 113, 1179; X-ray Emission from the Host Clusters of Powerful AGN.
Hutchings, J.B., Neff, S.G. 1991, AJ, 101, 2001; Optical Imaging of the Low Redshift Superluminous QSO 1821+643.
Hynes, S.J.; Planetary Nebulae; Richmond, VA.; Willmann-Bell 1991.
Karge, S.; Helle Quasare für 8- bis 10-Zoll Teleskope. Ein Beobachtungsführer zur visuellen Beobachtung von
     Quasaren und BL Lacertae Objekten; Frankfurt 2005.
Kirhakos, S.D., Sargent, W.S.W., et al. 1994, PASP, 106, 646; The HST Quasar Absorption-Line Key Project. VIII.
     CCD Imaging of Hubble Space Telescope Quasar Fields.
Kolman, M., Halpern, J.P., et al. 1991, ApJ, 373, 57; The Ultraviolet Spectrum and Continuum Energy Distribution
     of the Bright Quasar H1821+643.
Noguchi, T., Maehara, H., Kondo, M. 1980, Ann. Tokyo Astr. Obs., 18, 1; A Search for Ultraviolet-Excess Objects.
Pravdo, S.H., Marshall, F.E. 1984, ApJ, 281, 570; Soft X-Ray Aktive Galactic Nuclei.
Schneider, D.P, Bahcall, J.N., et al. 1992, AJ, 103, 1047; The Cluster of Galaxies associated with the Low-Redshift
     Quasar H1821+643.
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.
Wegner, G., Africano, J.L., Goodrich, B. 1990, AJ, 99, 1907; Photoelectric Photometry for 106 Objects in the KISO
     Survey.
    



Links:

Hamburg Quasar Monitoring

Image by WIYN Observatory

PK 94+27.1 & KUV 18217+6419: drawing by Uwe Glahn



©  Stefan Karge  /  last obs. 2020-11-16






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