IOTA/IOTA-ES occultation update for (4368) Pillmore / HIP 18893 event on 2012 Dec 13, 22:57 UT Visible from Africa Summary ------- On 2012 Dec 13 UT, the 22 km diameter asteroid (4368) Pillmore will occult a 6.9 mag star in the constellation Taurus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 9.2 mag to 16.1 mag (the magnitude of the asteroid) for at most 1.7 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: . The event at a glimpse ---------------------- * Rank: 14 * date and approx. time of event: 2012 Dec 13, 22:51 - 2012 Dec 13, 23:02 UT * geocentric midpoint of event [JD]: 2456275.4566625 * magnitude of target star: 6.9 * magnitude drop [mag]: 9.2 * estimated maximum duration [s]: 1.7 * Moon: 1 % sunlit, 150° distance * Sun: 156° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 30 * 1 sigma uncertainty interval [path widths]: +/- 4.84 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .081 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .082", .048", 101° ) * approx speed of asteroid's shadow [km/s]: 12.9898 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 18893 by 4368 Pillmore on 2012 Dec 13 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 - 35 0 0 -57 21 58 23 2 52 20 29 0 -57 11 4 -57 32 55 -55 27 41 -59 21 15 - 34 0 0 -56 53 26 23 2 49 21 28 -1 -56 42 30 -57 4 24 -54 58 55 -58 52 59 - 33 0 0 -56 24 23 23 2 46 21 27 -2 -56 13 27 -56 35 23 -54 29 40 -58 24 11 - 32 0 0 -55 54 52 23 2 43 22 26 -2 -55 43 54 -56 5 52 -53 59 57 -57 54 53 - 31 0 0 -55 24 51 23 2 39 23 25 -3 -55 13 52 -55 35 53 -53 29 47 -57 25 3 - 30 0 0 -54 54 22 23 2 36 23 24 -4 -54 43 23 -55 5 25 -52 59 11 -56 54 43 - 29 0 0 -54 23 26 23 2 32 24 23 -5 -54 12 26 -54 34 29 -52 28 8 -56 23 54 - 28 0 0 -53 52 2 23 2 28 25 22 -5 -53 41 1 -54 3 5 -51 56 39 -55 52 36 - 27 0 0 -53 20 12 23 2 24 25 21 -6 -53 9 11 -53 31 16 -51 24 47 -55 20 50 - 26 0 0 -52 47 57 23 2 20 26 20 -7 -52 36 56 -52 59 1 -50 52 30 -54 48 36 - 25 0 0 -52 15 17 23 2 16 27 19 -8 -52 4 16 -52 26 21 -50 19 51 -54 15 56 - 24 0 0 -51 42 14 23 2 12 28 18 -8 -51 31 13 -51 53 18 -49 46 50 -53 42 51 - 23 0 0 -51 8 49 23 2 7 28 17 -9 -50 57 48 -51 19 52 -49 13 27 -53 9 21 - 22 0 0 -50 35 1 23 2 2 29 16 -10 -50 24 1 -50 46 4 -48 39 45 -52 35 28 - 21 0 0 -50 0 54 23 1 57 30 15 -11 -49 49 54 -50 11 56 -48 5 45 -52 1 13 - 20 0 0 -49 26 27 23 1 52 30 14 -12 -49 15 29 -49 37 28 -47 31 26 -51 26 37 - 19 0 0 -48 51 42 23 1 47 31 13 -13 -48 40 45 -49 2 42 -46 56 52 -50 51 41 - 18 0 0 -48 16 41 23 1 42 32 12 -13 -48 5 44 -48 27 40 -46 22 1 -50 16 26 - 17 0 0 -47 41 24 23 1 36 33 11 -14 -47 30 29 -47 52 22 -45 46 57 -49 40 55 - 16 0 0 -47 5 53 23 1 31 33 10 -15 -46 54 59 -47 16 49 -45 11 41 -49 5 7 - 15 0 0 -46 30 9 23 1 25 34 9 -16 -46 19 16 -46 41 3 -44 36 12 -48 29 5 - 14 0 0 -45 54 13 23 1 19 35 8 -17 -45 43 23 -46 5 6 -44 0 34 -47 52 50 - 13 0 0 -45 18 7 23 1 13 35 7 -18 -45 7 19 -45 28 59 -43 24 47 -47 16 24 - 12 0 0 -44 41 53 23 1 6 36 6 -18 -44 31 6 -44 52 42 -42 48 52 -46 39 48 - 11 0 0 -44 5 32 23 1 0 37 5 -19 -43 54 47 -44 16 19 -42 12 51 -46 3 3 - 10 0 0 -43 29 4 23 0 53 37 3 -20 -43 18 22 -43 39 49 -41 36 45 -45 26 10 - 9 0 0 -42 52 32 23 0 47 38 2 -21 -42 41 52 -43 3 15 -41 0 36 -44 49 13 - 8 0 0 -42 15 58 23 0 40 39 1 -22 -42 5 20 -42 26 38 -40 24 25 -44 12 11 - 7 0 0 -41 39 21 23 0 33 39 360 -23 -41 28 46 -41 49 59 -39 48 14 -43 35 7 - 6 0 0 -41 2 45 23 0 26 40 358 -23 -40 52 12 -41 13 20 -39 12 3 -42 58 2 - 5 0 0 -40 26 10 23 0 18 40 357 -24 -40 15 40 -40 36 43 -38 35 54 -42 20 57 - 4 0 0 -39 49 38 23 0 11 41 356 -25 -39 39 10 -40 0 8 -37 59 49 -41 43 54 - 3 0 0 -39 13 10 23 0 4 42 355 -26 -39 2 45 -39 23 37 -37 23 48 -41 6 55 - 2 0 0 -38 36 47 22 59 56 42 353 -27 -38 26 25 -38 47 11 -36 47 54 -40 30 0 - 1 0 0 -38 0 31 22 59 48 43 352 -27 -37 50 12 -38 10 53 -36 12 7 -39 53 12 0 0 0 -37 24 23 22 59 41 43 350 -28 -37 14 7 -37 34 42 -35 36 28 -39 16 32 1 0 0 -36 48 25 22 59 33 43 349 -29 -36 38 12 -36 58 41 -35 1 0 -38 40 0 2 0 0 -36 12 38 22 59 25 44 348 -30 -36 2 27 -36 22 51 -34 25 42 -38 3 40 3 0 0 -35 37 3 22 59 17 44 346 -30 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-21 53 24 22 55 32 43 308 -43 -21 44 31 -22 2 18 -20 19 44 -23 29 45 31 0 0 -21 29 41 22 55 24 43 306 -43 -21 20 51 -21 38 33 -19 56 24 -23 5 37 32 0 0 -21 6 33 22 55 16 42 305 -43 -20 57 44 -21 15 23 -19 33 38 -22 42 5 33 0 0 -20 43 59 22 55 8 41 304 -43 -20 35 13 -20 52 47 -19 11 25 -22 19 7 34 0 0 -20 22 0 22 55 1 41 303 -43 -20 13 16 -20 30 46 -18 49 48 -21 56 45 35 0 0 -20 0 36 22 54 53 40 302 -43 -19 51 54 -20 9 20 -18 28 44 -21 35 0 36 0 0 -19 39 48 22 54 46 40 301 -43 -19 31 8 -19 48 30 -18 8 16 -21 13 50 37 0 0 -19 19 36 22 54 39 39 300 -42 -19 10 57 -19 28 16 -17 48 23 -20 53 17 38 0 0 -19 0 0 22 54 31 39 299 -42 -18 51 23 -19 8 38 -17 29 5 -20 33 20 39 0 0 -18 41 0 22 54 24 38 298 -42 -18 32 25 -18 49 36 -17 10 24 -20 14 1 40 0 0 -18 22 36 22 54 17 37 298 -42 -18 14 3 -18 31 11 -16 52 18 -19 55 19 41 0 0 -18 4 50 22 54 11 37 297 -42 -17 56 18 -18 13 23 -16 34 48 -19 37 14 42 0 0 -17 47 40 22 54 4 36 296 -41 -17 39 10 -17 56 11 -16 17 54 -19 19 47 43 0 0 -17 31 8 22 53 57 35 295 -41 -17 22 39 -17 39 37 -16 1 37 -19 2 57 44 0 0 -17 15 13 22 53 51 34 294 -41 -17 6 46 -17 23 41 -15 45 57 -18 46 46 45 0 0 -16 59 55 22 53 44 34 294 -40 -16 51 29 -17 8 22 -15 30 54 -18 31 13 46 0 0 -16 45 15 22 53 38 33 293 -40 -16 36 51 -16 53 41 -15 16 28 -18 16 18 47 0 0 -16 31 13 22 53 32 32 292 -40 -16 22 50 -16 39 37 -15 2 39 -18 2 2 48 0 0 -16 17 49 22 53 26 31 292 -39 -16 9 27 -16 26 12 -14 49 27 -17 48 25 49 0 0 -16 5 3 22 53 20 31 291 -39 -15 56 42 -16 13 25 -14 36 53 -17 35 26 50 0 0 -15 52 55 22 53 15 30 291 -38 -15 44 36 -16 1 16 -14 24 56 -17 23 7 51 0 0 -15 41 26 22 53 9 29 290 -38 -15 33 7 -15 49 46 -14 13 37 -17 11 26 52 0 0 -15 30 35 22 53 4 28 290 -37 -15 22 18 -15 38 54 -14 2 56 -17 0 25 53 0 0 -15 20 23 22 52 59 27 289 -37 -15 12 6 -15 28 41 -13 52 53 -16 50 3 54 0 0 -15 10 50 22 52 54 26 289 -36 -15 2 34 -15 19 7 -13 43 28 -16 40 20 55 0 0 -15 1 55 22 52 49 26 288 -36 -14 53 40 -15 10 12 -13 34 42 -16 31 18 56 0 0 -14 53 40 22 52 44 25 288 -35 -14 45 25 -15 1 56 -13 26 33 -16 22 54 57 0 0 -14 46 3 22 52 39 24 287 -34 -14 37 49 -14 54 19 -13 19 3 -16 15 11 58 0 0 -14 39 6 22 52 35 23 287 -34 -14 30 53 -14 47 21 -13 12 12 -16 8 8 59 0 0 -14 32 48 22 52 30 22 286 -33 -14 24 35 -14 41 2 -13 5 59 -16 1 44 60 0 0 -14 27 10 22 52 26 21 286 -33 -14 18 57 -14 35 23 -13 0 25 -15 56 1 61 0 0 -14 22 11 22 52 22 20 286 -32 -14 13 58 -14 30 24 -12 55 30 -15 50 58 62 0 0 -14 17 51 22 52 18 19 285 -31 -14 9 39 -14 26 4 -12 51 13 -15 46 35 63 0 0 -14 14 11 22 52 15 18 285 -30 -14 6 0 -14 22 24 -12 47 36 -15 42 52 64 0 0 -14 11 11 22 52 11 18 285 -30 -14 3 0 -14 19 24 -12 44 38 -15 39 50 65 0 0 -14 8 51 22 52 8 17 284 -29 -14 0 40 -14 17 3 -12 42 19 -15 37 29 66 0 0 -14 7 11 22 52 5 16 284 -28 -13 58 59 -14 15 23 -12 40 39 -15 35 48 67 0 0 -14 6 10 22 52 2 15 284 -27 -13 57 59 -14 14 23 -12 39 38 -15 34 48 68 0 0 -14 5 50 22 51 59 14 283 -27 -13 57 39 -14 14 3 -12 39 17 -15 34 29 69 0 0 -14 6 10 22 51 57 13 283 -26 -13 57 59 -14 14 23 -12 39 36 -15 34 51 70 0 0 -14 7 11 22 51 54 12 283 -25 -13 58 59 -14 15 24 -12 40 34 -15 35 54 71 0 0 -14 8 52 22 51 52 11 283 -24 -14 0 40 -14 17 5 -12 42 12 -15 37 38 72 0 0 -14 11 13 22 51 50 10 282 -23 -14 3 1 -14 19 27 -12 44 29 -15 40 4 73 0 0 -14 14 15 22 51 48 9 282 -23 -14 6 2 -14 22 29 -12 47 27 -15 43 10 74 0 0 -14 17 58 22 51 46 8 282 -22 -14 9 44 -14 26 12 -12 51 4 -15 46 58 75 0 0 -14 22 21 22 51 45 7 282 -21 -14 14 7 -14 30 36 .. .. .. -15 51 28 76 0 0 -14 27 25 22 51 43 6 281 -20 -14 19 10 -14 35 41 .. .. .. -15 56 39 77 0 0 -14 33 10 22 51 42 5 281 -19 -14 24 55 -14 41 26 .. .. .. -16 2 32 78 0 0 -14 39 36 22 51 41 4 281 -18 -14 31 20 -14 47 53 .. .. .. -16 9 7 79 0 0 -14 46 43 22 51 40 3 280 -17 -14 38 26 -14 55 1 .. .. .. -16 16 23 80 0 0 -14 54 32 22 51 40 2 280 -17 -14 46 14 -15 2 51 .. .. .. -16 24 22 81 0 0 -15 3 1 22 51 39 1 280 -16 -14 54 42 -15 11 21 .. .. .. -16 33 2 82 0 0 -15 12 12 22 51 39 0 280 -15 -15 3 52 -15 20 33 .. .. .. -16 42 25 Uncertainty in time = +/- 10 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: HIP 18893 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 02 59.5873 DE: +09 12 28.385 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .012, .012 ) * V mag [mag]: 6.9 * B mag [mag]: 7.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4368) Pillmore approx. diameter [km]: 22 approx. diameter ["]: .013 distance from Earth [AU]: 2.25900 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 817 number of rejected observations: 12 time covered by the observations: 1977 Oct 16 - 2012 Nov 06 1 sigma uncertainty ellipse (major, minor, PA): 0.081, 0.046, 101° remarks: * orbital elements for (4368) Pillmore : Mean anomaly = 79.82739019 deg Arg. of pericenter = 120.92671868 deg Long. of node = 225.64043668 deg Inclination = 20.94475126 deg Eccentricity = 0.01880269 Semimajor axis = 3.19144707 AU Perihelion dist = 3.13143929 AU Mag: H = 11.39, G = 0.15 Epoch of elements : MJD 56274.95700000 TDT (2012 Dec 13.957) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 13 4368 Pillmore 22h 57.6m UT 6.9 4 2 59.587 9 12 28.38HIP 18893 7.4 16.1 22 1.7 2.259 -1.704 -13.32 -6.6768 9.211 -165.74 -23.22 22.9599 0.32212 -0.60425 -6.48306 -3.42417 0.00198 0.00153 2000 78.970468201212 9.00000120.926719225.640437 20.9447510.01880269 3.1914471 3.131439311.3 5.00.15 RATE 1.7287110 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.082 0.048 101 5.84 0.065 0 0 3 5 056264.0020121213__18893 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 10:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org