IOTA/IOTA-ES occultation update for (2378) Pannekoek / UCAC2 31813425 event on 2012 Dec 19, 08:19 UT Visible from USA, SE Canada Summary ------- On 2012 Dec 19 UT, the 38 km diameter asteroid (2378) Pannekoek will occult a 11.7 mag star in the constellation Orion for observers along a path across USA, SE Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 14.2 mag (the magnitude of the asteroid) for at most 3.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 46 * date and approx. time of event: 2012 Dec 19, 08:11 - 2012 Dec 19, 08:27 UT * geocentric midpoint of event [JD]: 2456280.847025 * magnitude of target star: 11.7 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 3.8 * Moon: 42 % sunlit, 100° distance * Sun: 157° distance * rough path description: USA, SE Canada The occultation path -------------------- * approximate projected width [km]: 50 * 1 sigma uncertainty interval [path widths]: +/- 1.43 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .049) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .049", 91° ) * approx speed of asteroid's shadow [km/s]: 10.0101 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 31813425 by 2378 Pannekoek on 2012 Dec 19 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 143 0 0 39 1 21 8 27 42 1 90 -15 39 15 2 38 47 43 39 54 27 .. .. .. 144 0 0 39 1 34 8 27 42 1 91 -16 39 15 15 38 47 56 39 54 40 .. .. .. 145 0 0 39 1 50 8 27 42 2 91 -16 39 15 31 38 48 12 39 54 55 .. .. .. 146 0 0 39 2 8 8 27 41 3 92 -17 39 15 49 38 48 30 39 55 13 .. .. .. 147 0 0 39 2 29 8 27 41 4 93 -18 39 16 10 38 48 51 39 55 34 .. .. .. 148 0 0 39 2 52 8 27 40 4 93 -19 39 16 33 38 49 14 39 55 57 .. .. .. 149 0 0 39 3 18 8 27 39 5 94 -19 39 16 58 38 49 39 39 56 22 38 10 55 150 0 0 39 3 46 8 27 38 6 95 -20 39 17 27 38 50 7 39 56 51 38 11 23 151 0 0 39 4 16 8 27 37 7 95 -21 39 17 57 38 50 38 39 57 21 38 11 53 152 0 0 39 4 49 8 27 35 7 96 -22 39 18 30 38 51 11 39 57 54 38 12 26 153 0 0 39 5 25 8 27 34 8 97 -22 39 19 6 38 51 47 39 58 29 38 13 2 154 0 0 39 6 3 8 27 32 9 97 -23 39 19 43 38 52 24 39 59 7 38 13 40 155 0 0 39 6 43 8 27 30 10 98 -24 39 20 24 38 53 5 39 59 48 38 14 20 156 0 0 39 7 25 8 27 28 11 98 -25 39 21 6 38 53 47 40 0 30 38 15 3 157 0 0 39 8 10 8 27 26 11 99 -25 39 21 51 38 54 32 40 1 15 38 15 48 158 0 0 39 8 58 8 27 24 12 100 -26 39 22 39 38 55 20 40 2 2 38 16 35 159 0 0 39 9 47 8 27 21 13 100 -27 39 23 28 38 56 9 40 2 52 38 17 25 160 0 0 39 10 39 8 27 19 14 101 -28 39 24 20 38 57 1 40 3 44 38 18 17 161 0 0 39 11 34 8 27 16 14 102 -28 39 25 15 38 57 56 40 4 38 38 19 11 162 0 0 39 12 30 8 27 13 15 102 -29 39 26 11 38 58 52 40 5 35 38 20 8 163 0 0 39 13 29 8 27 10 16 103 -30 39 27 10 38 59 51 40 6 34 38 21 6 164 0 0 39 14 30 8 27 7 17 104 -31 39 28 11 39 0 52 40 7 35 38 22 7 165 0 0 39 15 33 8 27 4 17 104 -31 39 29 14 39 1 55 40 8 38 38 23 11 166 0 0 39 16 39 8 27 0 18 105 -32 39 30 19 39 3 0 40 9 43 38 24 16 167 0 0 39 17 46 8 26 57 19 106 -33 39 31 27 39 4 8 40 10 51 38 25 23 168 0 0 39 18 56 8 26 53 19 106 -34 39 32 37 39 5 18 40 12 0 38 26 33 169 0 0 39 20 7 8 26 49 20 107 -35 39 33 48 39 6 29 40 13 12 38 27 45 170 0 0 39 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19 10 44 25 52 .. .. .. - 35 0 0 43 32 43 8 11 44 1 269 -17 43 46 24 43 19 5 44 25 47 .. .. .. - 34 0 0 43 32 36 8 11 43 0 270 -16 43 46 17 43 18 58 44 25 40 .. .. .. Uncertainty in time = +/- 6 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: UCAC2 31813425 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 50 11.6993 DE: +00 09 29.823 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .034, .037 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2378) Pannekoek approx. diameter [km]: 38 approx. diameter ["]: .034 distance from Earth [AU]: 1.53800 * orbital information: orbit source: Preston date of fit: 2012 Dec 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1037 number of rejected observations: 32 time covered by the observations: 1918 Sep 16 - 2012 Dec 09 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.031, 91° remarks: * orbital elements for (2378) Pannekoek : Mean anomaly = 0.83748058 deg Arg. of pericenter = 265.24078139 deg Long. of node = 181.21153147 deg Inclination = 14.24590895 deg Eccentricity = 0.14452343 Semimajor axis = 2.88974940 AU Perihelion dist = 2.47211292 AU Mag: H = 10.97, G = 0.15 Epoch of elements : MJD 56280.34700000 TDT (2012 Dec 19.347) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 19 2378 Pannekoek 8h 19.7m UT 11.7 5 50 11.699 0 9 29.82UCAC2 31813425 0.0 14.2 38 3.8 1.538 -2.153 -1.26 -125.7190 0.160 54.39 -23.42 8.3286 -0.02595 0.65575 -5.64564 -0.22202 0.00002 0.00230 2000 0.76786020121219.00000265.240781181.211531 14.2459090.14452343 2.8897494 2.472112910.7 5.00.15 RATE 2.0063820 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.049 91 2.43 0.049 0 0 3 3 056278.0020121219_813425 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Dec 16, 18:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org