Frankfurt Quasar Monitoring

PKS 0405-12
Object data

  Cross-Identifications  OF-109, MSH 04-102, TXS 0405-123, 0405-123
  PKS 0405-123, LEDA 2823804, 1ES 0405-123
  RX J0407.8-1211, 2MASSi J0407484-121136

  Equat. coordinates   RA  04 07 48.5     DE  -12 11 36     (J2000)
  Constellation   Eridanus
  Type   QSO
  Redshift   z=0.5726
  Distance (2) (3)   2057 Mpc
  Total mag range (mv) (4)   14.3 - 15.4
  Catalog Magnitude (1)   14.86
  Absolute Magnitude (1)   -27.7 MB
  Light Travel-Time (2)   5.364 × 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

Comparison stars

star  B V
A 12.92 11.92
B 13.13 12.54
C 14.05 13.35
D 14.84 14.34
E 15.88 15.28
comparison stars from Angione 1971, AJ, 73, 5

Colour chart
Credit: DSS2  /  Size 14´× 14´ /  Chart by S. Karge

Light curve

PKS 0405-12 is a variable quasar in northern Eridanus, only 1.6° W of planetary nebula NGC 1535, and 2.7° NE of Gamma Eridani. The designation PKS 0405-12 refers to the Parkes Radio Survey (PKS), where this object was cataloged as a radio source. Initially, this object was discovered in the late 1950s as a radio source during a radio survey, undertaken with the Sydney cross-type radio telescope (MSH). In 1966, a 16-mag stellar object was identified as the optical counterpart of the radio source. Spectroscopic investigations revealed a typical Seyfert-1 spectrum, which led to the quasar classification. In the same year 1966, the first redshift of z=0.574 was determined. This corresponds to a cosmological distance of more than 5×109 light-years! Besides the radio, PKS 0405-12 also has been known as a source of UV, IR and X-ray emissions. Additionally, the quasar host (LEDA) is a member of a remote galaxy cluster.
Quasar PKS 0405-12 is often given with its other common designation OF-109.

PKS 0405-12 is a small amplitude variable with a total range of about 1 magnitude in the optical. For visual observers with telescopes of at least 8- to 10-inch of aperture, this quasar is a nice observing target. It appears as a stellar object even with large aperture telescopes. CCD observers, as well as visual observers, shall use the comparison stars given above. The comparison stars C=13.35 and D=14.34 are recommended for both unfiltered and v-mag photometry.
Another sequence was published by 
Gonzŕlez-Pérez et al. (2001).

When you are around focussing on quasar PKS 0405-12 do not miss NGC 1535, a bright planetary nebula and a showpiece of its class, only 1.6° W of PKS 0405-12.

Those observers who like to track down some more very old quasi-stellar photons may turn to the bright and variable BL Lac object MG 0509+0541, a 15-mag object, some 23° NE in Orion.
violently variable BL Lac object is PKS 0422+00. It can be found 13.4° NNE in southern Taurus, close to the constellation of Eridanus/Orion.

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Angione, R.J. 1971, AJ, 76, 412; Photoelectric Sequences for the Brighter QSO´s.
Angione, R.J. 1973, AJ, 78, 353; QSO historical Light Curves.
Angione, R.J., Moore, E.P., et al. 1981, AJ, 86, 653; Optical Monitoring of 15 Quasars.
Bolton, J.G., et al. 1966, ApJ, 144, 1229; Radio and Optical data on Fifteen Quasi-Stellar Objects.
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Véron-Cetty, M.-P., Véron, P. 2010, A&A 518, 10; A Catalogue of Quasars and Active Nuclei: 13th edition.


Hamburg Quasar Monitoring

© Stefan Karge (FQM)  /  last obs. 2024-02-20