IOTA/IOTA-ES occultation update for (32) Pomona / 2UCAC 28642556 event on 2007 Jul 04, 19:30 UT Visible from Indonesia, Africa Summary ------- On 2007 Jul 04 UT, the 81 km diameter asteroid (32) Pomona will occult a 11.8 mag star in the constellation Aquarius for observers along a path across Indonesia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 11.4 mag (the magnitude of the asteroid) for at most 9.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 96 * date and approx. time of event: 2007 Jul 04, 19:17 - 2007 Jul 04, 19:43 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 9.7 * Moon: 81 % sunlit, 25° distance * Sun: 151° distance * rough path description: Indonesia, Africa Additional comments ------------------- small mag drop The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .028", 84° ) * approx speed of asteroid's shadow [km/s]: 8.3118 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 28642556 by 32 Pomona on 2007 Jul 04 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 3 0 0 .. .. .. .. .. .. .. .. .. .. .. .. 3 40 36 .. .. .. 3 21 45 4 0 0 3 53 3 19 43 14 1 100 -25 4 15 31 3 30 36 4 34 24 3 11 45 5 0 0 3 43 7 19 43 14 2 100 -26 4 5 34 3 20 40 4 24 27 3 1 49 6 0 0 3 33 14 19 43 13 3 100 -26 3 55 42 3 10 48 4 14 35 2 51 58 7 0 0 3 23 26 19 43 12 4 100 -27 3 45 54 3 1 0 4 4 46 2 42 10 8 0 0 3 13 43 19 43 11 5 100 -28 3 36 10 2 51 17 3 55 2 2 32 27 9 0 0 3 4 4 19 43 10 6 100 -29 3 26 31 2 41 38 3 45 23 2 22 49 10 0 0 2 54 30 19 43 8 7 100 -30 3 16 56 2 32 5 3 35 48 2 13 15 11 0 0 2 45 1 19 43 6 8 100 -31 3 7 27 2 22 36 3 26 18 2 3 47 12 0 0 2 35 37 19 43 4 9 100 -32 2 58 2 2 13 12 3 16 54 1 54 23 13 0 0 2 26 18 19 43 2 10 100 -33 2 48 43 2 3 54 3 7 34 1 45 5 14 0 0 2 17 5 19 43 0 11 100 -34 2 39 30 1 54 41 2 58 21 1 35 53 15 0 0 2 7 57 19 42 57 12 100 -35 2 30 22 1 45 33 2 49 12 1 26 45 16 0 0 1 58 55 19 42 54 13 100 -36 2 21 19 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18 24 17 258 10 6 52 18 6 7 21 7 11 12 5 48 29 171 0 0 6 40 5 19 18 20 16 258 11 7 2 34 6 17 37 7 21 29 5 58 45 172 0 0 6 50 22 19 18 17 15 258 12 7 12 52 6 27 54 7 31 46 6 9 2 173 0 0 7 0 40 19 18 13 14 258 13 7 23 9 6 38 12 7 42 4 6 19 20 174 0 0 7 10 58 19 18 10 13 259 14 7 33 27 6 48 29 7 52 21 6 29 38 175 0 0 7 21 16 19 18 7 12 259 15 7 43 45 6 58 47 8 2 39 6 39 56 176 0 0 7 31 33 19 18 5 11 259 16 7 54 3 7 9 5 8 12 57 6 50 13 177 0 0 7 41 51 19 18 2 10 259 17 8 4 20 7 19 23 8 23 15 7 0 31 178 0 0 7 52 8 19 18 0 9 259 18 8 14 37 7 29 40 8 33 32 7 10 48 179 0 0 8 2 24 19 17 58 8 259 19 8 24 54 7 39 56 8 43 48 7 21 4 180 0 0 8 12 40 19 17 56 7 259 20 8 35 9 7 50 11 8 54 3 7 31 20 -179 0 0 8 22 54 19 17 55 6 259 21 8 45 23 8 0 26 9 4 17 7 41 34 -178 0 0 8 33 7 19 17 53 5 260 22 8 55 36 8 10 39 9 14 30 7 51 47 -177 0 0 8 43 19 19 17 52 4 260 23 9 5 48 8 20 51 9 24 42 8 1 59 -176 0 0 8 53 28 19 17 51 3 260 24 9 15 57 8 31 1 9 34 51 8 12 9 -175 0 0 9 3 36 19 17 51 2 260 25 9 26 5 8 41 9 9 44 59 8 22 18 -174 0 0 9 13 42 19 17 50 1 260 26 9 36 11 8 51 15 9 55 5 8 32 24 -173 0 0 9 23 46 19 17 50 0 260 27 9 46 15 9 1 19 10 5 8 8 42 28 Data for the target star ------------------------ * name: 2UCAC 28642556 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 41 56.9220 DE: -09 27 29.148 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .024 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (32) Pomona approx. diameter [km]: 81 approx. diameter ["]: .067 distance from Earth [AU]: 1.67100 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 746 number of rejected observations: 167 time covered by the observations: 1910 Jan 31 - 2007 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.015, 76° remarks: * orbital elements for (32) Pomona : Mean anomaly = 90.38396933 deg Arg. of pericenter = 339.37864324 deg Long. of node = 220.56479149 deg Inclination = 5.52968419 deg Eccentricity = 0.08313709 Semimajor axis = 2.58683855 AU Perihelion dist = 2.37177633 AU Mag: H = 7.53, G = 0.15 Epoch of elements : MJD 54285.81300000 TDT (2007 Jul 04.813) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 04 32 Pomona 19h 30.5m UT 11.8 20 41 56.922- 9 27 29.152UCAC 28642556 0.0 11.4 81 9.7 1.671 -1.668 -1.17 95.427 -9.458 -111.53 22.86 19.5088 -.00499 .11804 -4.68617 -0.22149 -0.00231 -0.00136 2000 89.00691672007 629.00000339.378643220.564791 5.5296840.083137092.586838552.371776337.565 0.15 RATE 2.3689183 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.031 0.028 84.3 1.420 0.028 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 02:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org