Pluto Occultation of P131.1

The following prediction is derived from astrometric measurements made by Kelly Clancy and Mike Person on 21 frames recorded on 2002 Aug. 9, 10, and 11 (UT) from the USNO 1.55-m Kaj Strand astrometric reflector by Steve Levine and Ron Stone. The star offsets are relative to the star's published position (McDonald and Elliot 2000)*. The Pluto offsets relative to its ephemeris were estimated from Pluto's recent occultation with P126 in July 2002. Results for Pluto are tabulated as offsets from the unmodified light-time corrected, geocentric JPL Horizon's ephemeris (PLU006 and DE-0406, LE-0406). Further analysis and the prediction calculation were carried out by Kelly Clancy and Jim Elliot.
Reference Position (2.0)* RA (J2000) Dec (J2000) R Mag*
P131.1 16 58 49.456 -12 51 31.41 15.65
Offsets from Reference
Body RA (arcsec) Dec (arcsec)  
P131.1 – 0.354+/– 0.004 – 0.459+/– 0.004  
Pluto – 0.02 +/– 0.01 – 0.023 +/– 0.01  

* AJ 120, 1599

P131.1 Current Prediction

(as of 2002 08 16

05:12 AM EDT)

Date and Time (yyyy mm dd hh:mm:ss) 2002 08 21 06:59:41 UT
Minimum Geocentric Separation (arcsec) 0.04 +/- 0.01
Position Angle (degrees) 117
Geocentric Shadow Velocity (km s-1) 6.6
Star Magnitude 15.7 (V)
Solar Angle (deg) 107
East Longitude (deg) -179
Distance (AU) 30.24
Prediction Version p131.1-2.8

Note: On map, the gray area is where the sun is more than 12 degrees below the horizon. The position angle is the angle (measured north through east) of the occulting body relative to the star at closest approach. Position angle is derived from the prediction notebook results and is useful for plotting the globes.

Prediction Notes

Archive of past P131.1 occultation predictions.

Pluto Occultation Predictions for Individual Sites

Site East Longitude Latitude Distance* (km) Immersion (UT)

Mid-time (UT)

Emersion (UT)

Altitude

P131.1

(Degrees)

Anderson Mesa -111 32 12 35 05 48 1405   06:45:12   12
Auckland 174 46 42 -36 54 24 26 07:03:01 07:05:50 07:08:39 66
Blenheim/Black Birch 173 48 12 -41 44 54 165 07:04:08 07:06:55 07:09:43 61
Dominion Observatory, Canada -123 25 00 48 31 12 330 06:41:34 06:44:20 06:47:05 13
Geocentric     894 06:57:50 06:59:41 07:01:32  
Guillermo Haro, Mexico -110 23 00 31 03 12 1815   06:45:40   13
Haleakala -156 15 24 20 42 24 583 06:47:18 06:49:44 06:52:11 51
Lick -121 38 12 37 20 36 723 06:42:53 06:45:08 06:47:23 18
Lowell -111 39 54 35 12 12 1390   06:45:11   13
Mauna Kea (IRTF) -155 28 29 19 49 46 463 06:47:13 06:49:49 06:52:24 51
Mt Lemmon -110 47 30 32 26 30 1675   06:45:30   13
Palomar -116 51 54 33 21 24 1311  

06:45:27

  17
San Diego -116 19 55 32 36 45 1401   06:45:32   17
San Felipe, Mexico -115 27 54 31 02 36 1580   06:45:43   17
Table Mountain -117 40 50 34 22 55 1182   06:45:21   17
Tonantzintla, Mexico -98 18 54 19 02 00 3275   06:47:41   6
WIRO -105 58 36 41 05 54 1058 06:43:26 06:44:37 06:45:49 6

* distance from the center of Pluto's path across the Earth. Any site beyond 1160 km (the half-light radius of the shadow) is considered to be outside the shadow. The error in the distance from the center is several hundred kilometers for this prediction, so some sites presently tabulated as outside the shadow may be within it and vice versa. The times may be in error by several minutes, so data recording should commence about 5 minutes prior to the predicted immersion time and end several minutes after the emersion time. Sites predicted to be outside the shadow should record data for 10-15 minutes, centered at the mid-time.

 

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

Last updated by Katie Carbonari (kcarbon@mit.edu) 2002 08 16 7:25 PM EDT