NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-23 T03:51:58 PDT
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For refcode 1992PASP..104..246W:
Retrieve 8 NED objects in this reference.
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
1992PASP..104..246W On the Use of Supernovae as Radio-Optical Astrometric Fiducial Points KURT W. WEILER Center for Advanced Space Sensing, Naval Research Laboratory, Code 4215, Washington, DC 20375-5000 Electronic mail: weiler@rira.nrl.navy.mil K. J. JOHNSTON Center for Advanced Space Sensing, Naval Research Laboratory, Code 4200, Washington, DC 20375-5000 Electronic mail: johnston@rira.nrl.navy.mil SCHUYLER D. VAN DYK Center for Advanced Space Sensing, Naval Research Laboratory, Code 4215.4, Washington, DC 20375-5000 Electronic mail: vandyk@rira.nrl.navy.mil Received 1991 December 2; accepted 1992 January 27 ABSTRACT. The high-accuracy radio astrometric reference frame is based on extragalactic radio sources which are optically faint (m_V_ > 15), while the most accurate optical astrometric reference frame is made up of bright galactic stars which are almost all radio quiet to current sensitivity limits. The HIPPARCOS mission is establishing positional accuracies for these bright stars at the several milliarcsecond level of precision, and advancements in space-based observations should eventually allow precisions at the submilliarcsecond level. However, the relationship between the two reference frames is difficult to establish directly to a level consistent with the internal precision of the two independent frames. The compact extragalactic radio sources are too faint for most optical astrometric techniques, and the bright stars which are active radio sources are often in binary or extended envelope systems where the radio and optical photocenters may be related at accuracies of only a few milliarcseconds. This difficulty may be alleviated by using the occasional optically and radio bright supernovae as pointlike fiducial marks for establishing relationships between the two reference frames. These independent reference-frame relationships can be accomplished from currently available ground-based platforms. We anticipate about two bright (m_V_ <~ 12) supernovae per decade which could serve as useful candidates for combined radio-optical astrometric observations.
Retrieve 8 NED objects in this reference.
Please click here for ADS abstract

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