Occultation of C313.2

The following prediction was made from the analysis of 23 frames taken with the 1.55-m Kaj Strand Astrometric Reflector (USNO Flasgstaff Station), during the period 2005 July 3-7, and kindly supplied to us by Hugh Harris. The offsets in the table below (from which the prediction has been calculated) refer to the difference between the inferred position of Pluto-Charon barycenter from the USNO frames and the geocentric, light-time corrected JPL Horizons ephemeris (PLU013, DE-0412, DE405). The offsets between the measured RA and Dec of C313.2 and its UCAC2 values are also given in the table.

Reference star position: (UCAC2, in epoch of event)	RA (J2000)	Dec (J2000)	R Mag
C313.2	17 28 55.0174	–15 00 54.750	14.8
Offsets from Reference Position/Ephemeris
Body	RA (arcsec)	Dec (arcsec)	Notes
C313.2	–0.0163 ±0.0010	+0.0350 ± 0.0019	From USNO frames
Pluto System Barycenter	–0.0026 ± 0.0020	–0.0311 ± 0.0040	From USNO frames
Charon	0 ±	0 ±	From PLU013

	C313.2 UCAC2.0 Prediction (as of: 2005 07 08)
Geocentric Mid-time (yyyy mm dd hh:mm:ss)	2005 7 11 03:36:59 UT
Minimum Geocentric Separation (arcsec)	0.099 ±0.004
Position Angle (deg)	173.7
Geocentric Shadow Velocity (km s^-1)	20.93
Star Magnitude	14.8 R
Solar Angle (deg)	152
East Longitude (deg)	–79.0
Distance (AU)	30.06
Prediction Version	C313.2-USNO-1.0

Prediction Notes

The separation between the center line and each of the limb lines is an estimated Charon radius of 590 km.
USNO

Archive of all C313.2 occultation predictions based on alternate sources of data, including past predictions.

C313.2 Occultation Predictions for Individual Sites

Site	East Longitude	Latitude	Distance (km)	Immersion (UT)	Mid-time (UT)	Emersion (UT)	Duration (sec)
Bellatrix	–68 10 48	–22 57 09	1197	---------	03:36:03	---------	----
Cerro Armazones	–70 11 47	–24 35 51	1053	---------	03:36:13	---------	----
CTIO	–70 48 54	–30 09 54	470	03:36:05	03:36:22	03:36:38	33
Gemini South	–70 43 24	–30 13 42	462	03:36:04	03:36:21	03:36:38	34
Geocentric	-----------	------------	2248	---------	03:36:59	--------	----
Las Campanas	–70 42 00	–29 00 30	590	03:36:19	03:36:20	03:36:20	1
La Silla	–70 43 48	–29 15 24	564	03:36:12	03:36:20	03:36:28	16
Paranal	–70 24 12	–24 37 30	1053	---------	03:36:14	---------	----
Pico dos Dias	–45 34 57	–22 32 04	782	---------	03:34:26	---------	----

"Distance" is the distance between the site and the closest approach of the shadow center ("impact parameter").
Approximate shadow velocity at all non-geocentric sites is 21.3 km/sec from east to west.
Durations, Immersion, and Emersion times are all based on an approximate Charon radius of 590km.

Please direct all inquiries to Planetary Astronomy Lab (planetary-astronomy@mit.edu)

Last updated by Emily A Kramer(ekramer@mit.edu) 2005-07-08 16:00

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