IOTA/IOTA-ES occultation update for (102) Miriam / TYC 0802-00479-1 event on 2012 Dec 20, 17:12 UT Visible from Philippines, SE Asia, India Summary ------- On 2012 Dec 20 UT, the 95 km diameter asteroid (102) Miriam will occult a 11.4 mag star in the constellation Cancer for observers along a path across Philippines, SE Asia, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 13.6 mag (the magnitude of the asteroid) for at most 9.8 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: 92 * date and approx. time of event: 2012 Dec 20, 17:03 - 2012 Dec 20, 17:24 UT * geocentric midpoint of event [JD]: 2456282.21751667 * magnitude of target star: 11.4 * magnitude drop [mag]: 2.3 * estimated maximum duration [s]: 9.8 * Moon: 55 % sunlit, 118° distance * Sun: 146° distance * rough path description: Philippines, SE Asia, India The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.49 * 1 sigma uncertainty interval [seconds]: +/- 5.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .033", 92° ) * approx speed of asteroid's shadow [km/s]: 9.6911 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0802-00479-1 by 102 Miriam on 2012 Dec 20 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 41 0 0 7 33 56 17 24 8 0 78 -33 8 0 26 7 7 27 8 26 26 6 41 30 42 0 0 7 47 4 17 24 8 1 78 -34 8 13 34 7 20 35 8 39 34 6 54 39 43 0 0 8 0 10 17 24 8 2 78 -35 8 26 39 7 33 41 8 52 39 7 7 45 44 0 0 8 13 11 17 24 7 3 78 -36 8 39 41 7 46 43 9 5 40 7 20 47 45 0 0 8 26 9 17 24 6 4 78 -37 8 52 39 7 59 41 9 18 37 7 33 46 46 0 0 8 39 4 17 24 5 5 78 -38 9 5 32 8 12 36 9 31 31 7 46 41 47 0 0 8 51 54 17 24 4 6 78 -39 9 18 22 8 25 26 9 44 20 7 59 32 48 0 0 9 4 39 17 24 3 7 79 -40 9 31 7 8 38 12 9 57 5 8 12 18 49 0 0 9 17 20 17 24 1 8 79 -41 9 43 48 8 50 54 10 9 45 8 25 0 50 0 0 9 29 56 17 23 59 9 79 -42 9 56 24 9 3 30 10 22 20 8 37 37 51 0 0 9 42 27 17 23 57 10 79 -43 10 8 54 9 16 2 10 34 51 8 50 8 52 0 0 9 54 53 17 23 55 11 79 -44 10 21 20 9 28 28 10 47 16 9 2 35 53 0 0 10 7 13 17 23 53 12 79 -45 10 33 39 9 40 48 10 59 35 9 14 56 54 0 0 10 19 28 17 23 50 13 80 -46 10 45 53 9 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39 -163 0 0 10 38 1 17 3 58 32 278 -1 11 4 26 10 11 38 11 30 19 9 45 48 -162 0 0 10 26 5 17 3 52 31 278 0 10 52 30 9 59 42 11 18 24 9 33 51 Uncertainty in time = +/- 6 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: TYC 0802-00479-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 11 51.3505 DE: +12 20 39.854 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .035, .032 ) * V mag [mag]: 11.4 * B mag [mag]: 13.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (102) Miriam approx. diameter [km]: 95 approx. diameter ["]: .069 distance from Earth [AU]: 1.89100 * orbital information: orbit source: Preston date of fit: 2012 Dec 16 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1364 number of rejected observations: 91 time covered by the observations: 1902 Jun 11 - 2012 Dec 08 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.010, 102° remarks: * orbital elements for (102) Miriam : Mean anomaly = 84.20072135 deg Arg. of pericenter = 147.48579650 deg Long. of node = 210.88224912 deg Inclination = 5.17846317 deg Eccentricity = 0.25285333 Semimajor axis = 2.66138485 AU Perihelion dist = 1.98844482 AU Mag: H = 9.28, G = 0.15 Epoch of elements : MJD 56281.71700000 TDT (2012 Dec 20.717) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 20 102 Miriam 17h 13.2m UT 11.4 8 11 51.351 12 20 39.85TYC 0802-00479-1 13.0 13.6 95 9.8 1.891 -1.736 0.84 134.9672 12.344 -78.82 -23.43 17.2204 0.00310 0.10046 -5.46698 0.17882 -0.00302 0.00134 2000 83.81094720121219.00000147.485797210.882249 5.1784630.25285333 2.6613849 1.9884448 9.3 5.00.15 RATE 2.2700870 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.033 92 1.49 0.034 0 0-5 4 056278.0020121220_0479-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Dec 16, 18:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org