The micrometers of the Carlsberg Automatic Meridian Circle

Astron. Astrophys. Suppl. Ser.

Evans

1998

Self Cite

Abstract. JPL DE405 is compared with optical positions of the outer planets Jupiter to Pluto. Systematic errors in some of the optical observations complicate the interpretation of the residuals between observation and DE405. A common offset in the right ascension of the outer planets suggests a frame-tie problem between DE405 and the ICRF. It is concluded that the overall accuracy of DE405 is better than 50 mas for these planets in the period 1984-1997.

Section: Carlsberg Automatic Meridian Circlementioning

confidence: 99%

Check on JPL DE405 using modern optical observations

Astron. Astrophys. Suppl. Ser.

Evans

1998

Self Cite

“…Carlsberg observations of outer Solar System objects. 19841985198619871988-89 19901991-92 1992-93 1994-95 Year 19841985198619871988-89 19901991-92 1992-93 1994 Ganymede …”

Section: Observationsmentioning

confidence: 99%

Carlsberg Positions of Planets Compared with JPL DE403

International Astronomical Union Colloquium

Buontempo

1997

A b s t r a c t . The Carlsberg meridian telescope has made nearly 20 000 observations of outer Solar System objects since it began operation in 1984. A preliminary version of the Hipparcos catalogue has been used to refer the positions to the International Celestial Reference Frame (ICRF). The observed positions of the major planets are compared with JPL DE403 which is also referred to the ICRF. The agreement with DE403 is good, except for the declination of Jupiter where there is a systematic difference reaching 0"15 in 1995. The cause of this discrepancy is being investigated at JPL with recent VLBI observations of Galileo.

“…It is situated at a latitude of 28.7° north and an altitude of 2400 m and is operated jointly by Copenhagen University Observatory, the Royal Greenwich Observatory and the Real Instituto y Observatorio de la Armada, San Fernando. The operating procedure is described in Helmer & Morrison (1985) and a description of the scanning-slit micrometer and photoelectric detector system can be found in Helmer et al (1991). The positions of the Solar System objects are measured once nightly as they cross the prime meridian.…”

Section: Carlsberg Astrometric Telescopementioning

confidence: 99%

“…. 198419851986196719881989199019911992199319941995 1 1 1 1 I 1 1 1 1 I 1 1 1 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ft* 1 1 : : #f*7 : Λ? i TT 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 = 1 1 1 1 1 1 I 1 1 1 1 1 1 1 1 1 1 ι ι I ι ι ι ι I ι ι ι I ί 1 1 1 1 1 1 1 1 1 1 1 1 1 1 I 1 1 1 1 I 1 1 1 1 I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 i 1 1 1 1 1 1 1 1 1 1 , i , , , .…”

Section: Jupiter (Ganymede and Callisto)mentioning

confidence: 99%

“…, ι , , , , i , 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1 u ι ι ι ι ι ι ι ι ι ι ! ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι ι I I I I j I 1 I I j ι ι ι I - 19841985198619871988198919901991Year 1992199319941995 The reconciliation of the two data types requires a rotation of 0"2 about the x-axis (in the plane of the equator and directed to zero RA) between the FK5 and extragalactic frames. However, the results from other work of comparing the optical and radio positions of galaxies (as yet unpublished), produces a rotation between the reference frames of less than half this amount.…”

Section: Jupiter (Ganymede and Callisto)mentioning

confidence: 99%

See 1 more Smart Citation

Carlsberg optical astrometry of the outer solar system

Symp. - Int. Astron. Union

Buontempo

1996

The Carlsberg astrometric telescope has made about 17000 observations of outer Solar System objects since it began operation in 1984. The observed positions of the major planets are compared with JPL DE200 and DE403. The agreement with DE403 is good in general, but unresolved discrepancies of the order 0″.1 are found in Jupiter and Saturn. The run-off between the observations and DE200 which was fitted to observations before 1980 emphasize the need to continue optical observations of the outer planets.