IOTA/IOTA-ES occultation update for (2378) Pannekoek / TYC 0117-01377-1 event on 2012 Dec 10, 19:08 UT Visible from Indonesia, Africa Summary ------- On 2012 Dec 10 UT, the 38 km diameter asteroid (2378) Pannekoek will occult a 8.3 mag star in the constellation Orion 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 5.9 mag to 14.2 mag (the magnitude of the asteroid) for at most 3.9 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: 55 * date and approx. time of event: 2012 Dec 10, 18:57 - 2012 Dec 10, 19:19 UT * geocentric midpoint of event [JD]: 2456272.29747917 * magnitude of target star: 8.3 * magnitude drop [mag]: 5.9 * estimated maximum duration [s]: 3.9 * Moon: 9 % sunlit, 129° distance * Sun: 155° distance * rough path description: Indonesia, Africa Additional comments ------------------- wide double star The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 1.14 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .047 +/- .039) * 1 sigma uncertainty ellipse (major, minor, PA): ( .047", .039", 90° ) * approx speed of asteroid's shadow [km/s]: 9.7876 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0117-01377-1 by 2378 Pannekoek on 2012 Dec 10 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 - 10 0 0 -18 30 11 19 19 10 0 90 -3 -18 19 49 -18 40 33 -17 56 12 -19 4 12 - 9 0 0 -18 29 39 19 19 10 1 89 -4 -18 19 18 -18 40 2 -17 55 40 -19 3 41 - 8 0 0 -18 28 56 19 19 9 2 89 -5 -18 18 34 -18 39 18 -17 54 57 -19 2 57 - 7 0 0 -18 28 0 19 19 9 3 89 -6 -18 17 38 -18 38 22 -17 54 0 -19 2 1 - 6 0 0 -18 26 51 19 19 8 4 88 -6 -18 16 29 -18 37 13 -17 52 51 -19 0 53 - 5 0 0 -18 25 30 19 19 7 5 88 -7 -18 15 8 -18 35 52 -17 51 30 -18 59 32 - 4 0 0 -18 23 56 19 19 6 6 88 -8 -18 13 34 -18 34 19 -17 49 56 -18 57 58 - 3 0 0 -18 22 10 19 19 5 7 87 -9 -18 11 48 -18 32 33 -17 48 10 -18 56 13 - 2 0 0 -18 20 12 19 19 4 8 87 -10 -18 9 50 -18 30 35 -17 46 12 -18 54 15 - 1 0 0 -18 18 2 19 19 2 9 87 -11 -18 7 40 -18 28 25 -17 44 1 -18 52 5 0 0 0 -18 15 39 19 19 1 10 86 -11 -18 5 17 -18 26 2 -17 41 38 -18 49 43 1 0 0 -18 13 5 19 18 59 10 86 -12 -18 2 42 -18 23 28 -17 39 3 -18 47 8 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0 0 3 50 41 18 59 31 35 268 -23 4 1 7 3 40 15 4 24 53 3 16 26 141 0 0 3 57 21 18 59 25 34 268 -22 4 7 47 3 46 55 4 31 33 3 23 8 142 0 0 4 3 51 18 59 19 33 268 -21 4 14 17 3 53 26 4 38 2 3 29 38 143 0 0 4 10 10 18 59 13 32 268 -20 4 20 36 3 59 45 4 44 21 3 35 58 144 0 0 4 16 19 18 59 7 31 268 -20 4 26 44 4 5 53 4 50 28 3 42 7 145 0 0 4 22 16 18 59 1 30 268 -19 4 32 41 4 11 51 4 56 25 3 48 5 146 0 0 4 28 2 18 58 56 29 268 -18 4 38 27 4 17 37 5 2 10 3 53 52 147 0 0 4 33 37 18 58 51 28 268 -17 4 44 1 4 23 12 5 7 45 3 59 27 148 0 0 4 39 0 18 58 45 27 268 -16 4 49 25 4 28 36 5 13 7 4 4 51 149 0 0 4 44 12 18 58 40 26 268 -15 4 54 36 4 33 48 5 18 19 4 10 3 150 0 0 4 49 13 18 58 36 25 268 -14 4 59 37 4 38 48 5 23 19 4 15 4 151 0 0 4 54 1 18 58 31 24 268 -14 5 4 25 4 43 37 5 28 7 4 19 54 152 0 0 4 58 38 18 58 26 23 268 -13 5 9 2 4 48 14 5 32 43 4 24 31 153 0 0 5 3 4 18 58 22 22 268 -12 5 13 27 4 52 40 5 37 8 4 28 57 154 0 0 5 7 17 18 58 18 21 268 -11 5 17 40 4 56 53 5 41 21 4 33 10 155 0 0 5 11 18 18 58 14 20 269 -10 5 21 41 5 0 54 5 45 22 4 37 12 156 0 0 5 15 7 18 58 10 19 269 -9 5 25 30 5 4 44 5 49 10 4 41 1 157 0 0 5 18 44 18 58 7 18 269 -8 5 29 7 5 8 20 5 52 47 4 44 39 158 0 0 5 22 8 18 58 3 17 269 -7 5 32 31 5 11 45 5 56 11 4 48 4 159 0 0 5 25 20 18 58 0 16 269 -6 5 35 43 5 14 57 5 59 23 4 51 16 160 0 0 5 28 20 18 57 57 15 269 -6 5 38 43 5 17 57 6 2 22 4 54 16 161 0 0 5 31 7 18 57 54 14 269 -5 5 41 30 5 20 45 6 5 9 4 57 4 162 0 0 5 33 42 18 57 52 13 269 -4 5 44 5 5 23 19 6 7 43 4 59 39 163 0 0 5 36 4 18 57 49 12 269 -3 5 46 27 5 25 41 6 10 5 5 2 1 164 0 0 5 38 13 18 57 47 11 269 -2 5 48 36 5 27 51 6 12 14 5 4 10 165 0 0 5 40 10 18 57 45 10 269 -1 5 50 32 5 29 47 6 14 10 5 6 7 166 0 0 5 41 54 18 57 43 9 269 0 5 52 16 5 31 31 6 15 54 5 7 51 Uncertainty in time = +/- 5 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0117-01377-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 57 26.6567 DE: +00 23 04.163 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .021 ) * V mag [mag]: 8.3 * B mag [mag]: 8.4 * 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]: 1.54500 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1034 number of rejected observations: 32 time covered by the observations: 1918 Sep 16 - 2012 Oct 31 1 sigma uncertainty ellipse (major, minor, PA): 0.041, 0.032, 90° remarks: * orbital elements for (2378) Pannekoek : Mean anomaly = 359.11787031 deg Arg. of pericenter = 265.24460306 deg Long. of node = 181.21343124 deg Inclination = 14.24594866 deg Eccentricity = 0.14454731 Semimajor axis = 2.88983007 AU Perihelion dist = 2.47211291 AU Mag: H = 10.97, G = 0.15 Epoch of elements : MJD 56271.79700000 TDT (2012 Dec 10.797) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 10 2378 Pannekoek 19h 8.4m UT 8.3 5 57 26.657 0 23 4.16TYC 0117-01377-1 8.4 14.2 38 3.9 1.545 -2.050 -6.56 82.3565 0.386 -108.81 -22.99 19.1395 0.02302 -0.10765 -5.40223 -1.15522 -0.00108 0.00225 2000 358.757338201212 9.00000265.244603181.213431 14.2459490.14454731 2.8898301 2.472112910.7 5.00.15 RATE 2.0062990 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.047 0.039 90 2.14 0.039 0 0-3 3 056264.0020121210_1377-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 10:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org