Table 7
TNOs offsets with respect to JPL ephemerides.
| Observed – JPL ephemeris | No. | JPL | ||||
| Δαcosδ | Δδ | Eα | Eδ | nights | ephemeris | |
| mas | mas | mas | mas | version | ||
|
|
||||||
| Eris | −020 | −068 | 084 | 055 | 09 | 28 |
| Haumea | −090 | −098 | 060 | 081 | 21 | 37 |
| Ixion | + 020 | + 191 | 092 | 093 | 15 | 09 |
| Makemake | −039 | −165 | 060 | 058 | 20 | 40 |
| Orcus | −087 | + 001 | 059 | 046 | 19 | 13 |
| Quaoar | −144 | −078 | 098 | 043 | 22 | 17 |
| Sedna | −043 | −160 | 040 | 080 | 05 | 17 |
| Varuna | −045 | + 005 | 015 | 015 | – | 21 |
| 2002 TX300 | −084 | −053 | 040 | 040 | – | 14 |
| 2003 AZ84 | + 232 | + 006 | 003 | 015 | – | 11 |
Notes. Average “observed minus JPL ephemeris” position offsets. Errors come from the standard deviation about the mean of individual nightly averages. TNO positions in the UCAC2 system come from a parallel astrometric program of CCD observations carried out during 2007–2010 at a variety of 0.6 m to 2.2 m telescopes in Chile, Brazil, and France. Each TNO ephemeris version is displayed. They were extracted using the JPL Horizons service (Giorgini et al. 1996). The listed offsets are provisional in the sense that the parallel program is still ongoing and further updates are expected. For three TNOs (Varuna, 2002 TX300, 2003 AZ84), offsets came from fits to actual observed stellar occultations (see discussion in Sect. 7).
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