A radio/optical reference frame. 5: Additional source positions in the mid-latitude southern hemisphere

Details A radio/optical reference frame. 5: Additional source positions in the mid-latitude southern hemisphere A radio/optical reference frame. 5: Additional source positions in the mid-latitude southern hemisphere

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..379r&link_type=abstract

The Astronomical Journal, vol. 107, no. 1, p. 379-384

Astronomy and Astrophysics

Astronomy

13

Position (Location), Radio Sources (Astronomy), Radio Spectra, Reference Stars, Astrometry, Astronomical Catalogs, Radio Astronomy, Southern Sky, Very Long Base Interferometry

Scientific paper

We report new accurate radio position measurements for 30 sources, preliminary positions for two sources, improved radio postions for nine additional sources which had limited previous observations, and optical positions and optical-radio differences for six of the radio sources. The Very Long Baseline Interferometry (VLBI) observations are part of the continuing effort to establish a global radio reference frame of about 400 compact, flat spectrum sources, which are evenly distributed across the sky. The observations were made using Mark III data format in four separate sessions in 1988-89 with radio telescopes at Tidbinbilla, Australia, Kauai, USA, and Kashima, Japan. We observed a total of 54 sources, including ten calibrators and three which were undetected. The 32 new source positions bring the total number in the radio reference frame catalog to 319 (172 northern and 147 southern) and fill in the zone -25 deg greater than delta greater than -45 deg which, prior to this list, had the lowest source density. The VLBI positions have an average formal precision of less than 1 mas, although unknown radio structure effects of about 1-2 mas may be present. The six new optical postion measurements are part of the program to obtain positions of the optical counterparts of the radio reference frame source and to map accurately the optical on to the radio reference frames. The optical measurements were obtained from United States Naval Observatory (USNO) Black Birch astrograph plates and source plates from the AAT, and Kitt Peak National Observatory (KPNO) 4 m, and the European Southern Observatory (ESO) Schmidt. The optical positions have an average precision of 0.07 sec, mostly due to the zero point error when adjusted to the FK5 optical frame using the IRS catalog. To date we have measured optical positions for 46 sources.

Affiliated with

Also associated with

No associations

Rating

A radio/optical reference frame. 5: Additional source positions in the mid-latitude southern hemisphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A radio/optical reference frame. 5: Additional source positions in the mid-latitude southern hemisphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A radio/optical reference frame. 5: Additional source positions in the mid-latitude southern hemisphere will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-865206