 The northern
limit, centerline, and southern limit of Pluto's shadow are shown by the
three lines across the globe pictured above. The shaded area represents
where the sun is more than 12 degrees below the horizon. |
P507 Prediction (as of: 2007 03 22) |
| Geocentric Mid-time (yyyy month dd hh:mm:ss) | 2007 September 27 14:51:42 UT |
| Minimum Geocentric Separation | 0.393 arcsec |
| Position Angle (Pluto relative to the star; measured north through east) | –152.362 degrees |
| Geocentric Velocity | 11.3 km/sec |
| Prediction Version | P507-AST-2.0 |
| Reference star position: (UCAC2, at epoch of event) |
RA (h:m:s; J2000) | Dec (d:m:s; J2000) | UCAC Mag1 |
| P507 | 17 44 38.3944 | –16 46 35.447 | 8.7 |
| P507 Corrected | ------- | ------- | |
| 1The
UCAC bandpass (579-642nm) is between V and R. |
|||
| Offsets
from Reference Position/Ephemeris2 |
|||
| Body | RA (arcsec) | Dec (arcsec) | Notes |
P507 |
------- | ------- | |
| Pluto | ------- |
------- | |
| 2All
"offsets" are defined in the ("corrected" –
"reference") or ("observed" – "calculated")
sense. The offsets should be added to reference positions to get the measured
positions, which we use to calculate the prediction. |
|||
Discussion
On September 27th, 2007, Pluto will occult P507 (= 2UCAC 25587116; as originally published in McDonald & Elliot, 2000; Table). The above map and the following prediction results from the P507's UCAC2 catalog position, with no offsets applied, compared to the light-time corrected, geocentric JPL Horizons ephemeris (System DE413 - Pluto source file; PLU013; Earth center source file; DE405).
Proper motion of the star has been applied up to the time of the occultation (according to the UCAC2 catalog, dRA: –14± 1.1 mas/yr, dDec: –28± 1.3 mas/yr).
Prediction Notes
Results of Previous Occultations
Results of the 2006 Pluto occultation are described and compared with results of the 1988 and 2002 occultation in a preprint, Changes in Pluto's Atmosphere: 1988-2006
Last updated by Carlos A Zuluaga (czuluaga@mit.edu) 2007-03-22 3:30
Please direct all inquiries to Planetary Astronomy Lab (planetary-astronomy@mit.edu)