Pluto Occultation June 14, 2007

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.

P468 Prediction

(as of: 2007 06 11)

Geocentric Mid-time (yyyy month dd hh:mm:ss) 2007 June 14 01:27:50± 00:00:14 UT
Minimum Geocentric Separation 0.022± 0.016 arcsec
Position Angle (Pluto relative to the star; measured north through east) -2.05 degrees
Geocentric Velocity 23.6 km/sec
Prediction Version P468-AST-1.5

 

Reference star position:
RA (h:m:s; J2000) Dec (d:m:s; J2000) UCAC Mag1
P468 Catalog2 17 50 20.7407 –16 22 42.134 15.9
P468 Corrected 17 50 20.7366 –16 22 42.255  

1The UCAC bandpass (579-642nm) is between V and R.

2UCAC2, at epoch of event.

Offsets from Reference Position/Ephemeris3
Body RA (arcsec) Dec (arcsec) Notes

P468

–0.0613± 0.0111 –0.121± 0.010 From 41 strip scans
Pluto4 –0.0489± 0.0111 +0.054± 0.013 218 strip scans and 89 USNO-61inch Telescope frames

3All "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.

4JPL Horizon's ephemeris (System DE413 - Pluto source file: PLU013; Earth center source file: DE405).

Discussion

Archive of all P468 occultation predictions based on alternate sources of data, including past predictions

Site Information

Site
East Longitude
Latitude

Altitude3

(km)

Distance4

(km)

Velocity

(km/s)

Boyden Obs.
26 23 48
–29 02 30
1.4
2431 S.
23.94
Cerro Armazones
–70 11 47
–24 35 51
0.5
1893 S.
23.86
Las Campanas
–70 42 00
–29 00 30
2.3
2366 S.
23.85
Pico dos Dias
–45 34 57
–22 32 04
1.9
1284 S.
24.00
SAAO
20 48 36
–32 22 54
1.8
2665 S.
23.96
Geocentric
----------
---------
---------
512 S.
23.63

3Altitude of each observatory is measured in kilometers above sea level.

4"Distance" refers to the closest approach distance of the "Site" to the center of Pluto's shadow in the shadow plane. The errors on all closest approach distances are ±362 km (one standard deviation). "S." means the site is South of the center of Pluto's shadow. "N." means the site is North of the center of Pluto's shadow.

P468 Occultation Predictions for Individual Sites

Site
Pluto Immersion (UT)5
Mid-Time (UT)5

Pluto Emersion (UT)5

Boyden Obs.
--------
01:25:14 (50°)
--------
Cerro Armazones
--------
01:31:09 (40°)
--------
Las Campanas
--------
01:30:03 (41°)
--------
Pico dos Dias
--------
01:29:51 (63°)
--------
SAAO
--------
01:25:37 (54°)
--------
Geocentric
01:27:04
01:27:50
01:28:36

 

5The errors on all times are ±00:00:14 (14 seconds; one standard deviation). In parenthesis is the elevation of the body above the celestial horizon in degrees.

Results of Previous Occultations

Results of the 2006 Pluto occultation are described and compared with results of the 1988 and 2002 occultation in the publication, Changes in Pluto's Atmosphere: 1988-2006


Last updated by Carlos A Zuluaga (czuluaga@mit.edu) 2007-06-28 10:57

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