IOTA/IOTA-ES occultation update for (1512) Oulu / TYC 0017-00236-1 event on 2012 Oct 10, 23:54 UT Visible from Africa, Brazil Summary ------- On 2012 Oct 10 UT, the 91 km diameter asteroid (1512) Oulu will occult a 11.7 mag star in the constellation Pisces for observers along a path across Africa, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 15.4 mag (the magnitude of the asteroid) for at most 5.8 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: 73 * date and approx. time of event: 2012 Oct 10, 23:49 - 2012 Oct 11, 00:01 UT * geocentric midpoint of event [JD]: 2456211.49694167 * magnitude of target star: 11.7 * magnitude drop [mag]: 3.7 * estimated maximum duration [s]: 5.8 * Moon: 25 % sunlit, 126° distance * Sun: 174° distance * rough path description: Africa, Brazil The occultation path -------------------- * approximate projected width [km]: 96 * 1 sigma uncertainty interval [path widths]: +/- 0.78 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .048", .030", 79° ) * approx speed of asteroid's shadow [km/s]: 15.8285 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0017-00236-1 by 1512 Oulu on 2012 Oct 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 - 88 0 0 -35 56 58 24 1 53 6 79 -1 -35 30 32 -36 23 27 -34 49 28 -37 4 56 - 87 0 0 -35 49 13 24 1 53 7 78 -1 -35 22 47 -36 15 44 -34 41 40 -36 57 15 - 86 0 0 -35 41 13 24 1 52 8 78 -2 -35 14 45 -36 7 46 -34 33 36 -36 49 19 - 85 0 0 -35 32 57 24 1 51 8 77 -3 -35 6 28 -35 59 31 -34 25 17 -36 41 6 - 84 0 0 -35 24 25 24 1 50 9 77 -4 -34 57 54 -35 51 1 -34 16 41 -36 32 38 - 83 0 0 -35 15 38 24 1 49 10 76 -5 -34 49 5 -35 42 14 -34 7 50 -36 23 54 - 82 0 0 -35 6 34 24 1 48 11 76 -5 -34 40 1 -35 33 13 -33 58 43 -36 14 55 - 81 0 0 -34 57 15 24 1 47 12 75 -6 -34 30 40 -35 23 55 -33 49 20 -36 5 40 - 80 0 0 -34 47 41 24 1 46 13 74 -7 -34 21 4 -35 14 22 -33 39 41 -35 56 9 - 79 0 0 -34 37 51 24 1 44 13 74 -8 -34 11 13 -35 4 34 -33 29 47 -35 46 23 - 78 0 0 -34 27 46 24 1 43 14 73 -9 -34 1 6 -34 54 30 -33 19 38 -35 36 22 - 77 0 0 -34 17 25 24 1 41 15 73 -10 -33 50 43 -34 44 11 -33 9 13 -35 26 6 - 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2 26 52 75 0 0 - 1 22 3 23 49 21 9 276 -14 - 0 55 53 - 1 48 17 - 0 15 11 - 2 29 22 76 0 0 - 1 24 52 23 49 20 8 276 -13 - 0 58 42 - 1 51 7 - 0 18 0 - 2 32 13 77 0 0 - 1 28 3 23 49 19 7 276 -12 - 1 1 52 - 1 54 18 - 0 21 9 - 2 35 25 78 0 0 - 1 31 34 23 49 18 6 276 -11 - 1 5 22 - 1 57 50 - 0 24 38 - 2 38 58 79 0 0 - 1 35 26 23 49 17 5 275 -10 - 1 9 13 - 2 1 42 - 0 28 28 - 2 42 51 80 0 0 - 1 39 38 23 49 17 4 275 -9 - 1 13 25 - 2 5 55 - 0 32 39 - 2 47 5 81 0 0 - 1 44 11 23 49 16 3 275 -8 - 1 17 57 - 2 10 29 - 0 37 9 - 2 51 40 82 0 0 - 1 49 4 23 49 16 2 275 -7 - 1 22 49 - 2 15 23 - 0 42 1 - 2 56 35 83 0 0 - 1 54 18 23 49 16 1 275 -6 - 1 28 2 - 2 20 38 - 0 47 13 - 3 1 52 Uncertainty in time = +/- 7 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 0017-00236-1 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 44 06.6579 DE: +05 16 13.210 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .039, .025 ) * V mag [mag]: 11.7 * B mag [mag]: 13.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1512) Oulu approx. diameter [km]: 91 approx. diameter ["]: .039 distance from Earth [AU]: 3.20100 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1225 number of rejected observations: 36 time covered by the observations: 1939 Mar 18 - 2012 Oct 05 1 sigma uncertainty ellipse (major, minor, PA): 0.030, 0.018, 61° remarks: * orbital elements for (1512) Oulu : Mean anomaly = 107.07978599 deg Arg. of pericenter = 240.73865065 deg Long. of node = 10.28727638 deg Inclination = 6.49562924 deg Eccentricity = 0.15089003 Semimajor axis = 3.94483459 AU Perihelion dist = 3.34959836 AU Mag: H = 9.50, G = 0.15 Epoch of elements : MJD 56210.99600000 TDT (2012 Oct 10.996) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 10 1512 Oulu 23h 55.6m UT 11.7 0 44 6.658 5 16 13.21TYC 0017-00236-1 13.0 15.4 91 5.8 3.201 -1.568 -7.33 -7.8553 5.272 177.79 -7.09 23.9266 0.09945 -0.31605 -8.52607 -2.66904 0.00054 0.00018 2000 106.95449520121010.00000240.738651 10.287276 6.4956290.15089003 3.9448346 3.3495984 9.6 5.00.15 RATE 1.2579430 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.048 0.030 79 1.78 0.030 0 0-1 0 056208.0020121010_0236-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 18:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org