IOTA/IOTA-ES occultation update for (92) Undina / TYC 1390-01056-1 event on 2012 Sep 08, 01:58 UT Visible from SW Asia, Europe Summary ------- On 2012 Sep 08 UT, the 121 km diameter asteroid (92) Undina will occult a 10.7 mag star in the constellation Cancer for observers along a path across SW Asia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 13.0 mag (the magnitude of the asteroid) for at most 3.3 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: 89 * date and approx. time of event: 2012 Sep 08, 01:56 - 2012 Sep 08, 01:57 UT * geocentric midpoint of event [JD]: 2456178.58250833 * magnitude of target star: 10.7 * magnitude drop [mag]: 2.4 * estimated maximum duration [s]: 3.3 * Moon: 55 % sunlit, 52° distance * Sun: 43° distance * rough path description: SW Asia, Europe The occultation path -------------------- * approximate projected width [km]: 141 * 1 sigma uncertainty interval [path widths]: +/- 0.55 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .022", 90° ) * approx speed of asteroid's shadow [km/s]: 36.1705 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1390-01056-1 by 92 Undina on 2012 Sep 8 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 3 0 0 36 43 23 1 56 18 1 64 -38 36 0 52 37 26 15 35 14 30 38 13 50 4 0 0 37 7 4 1 56 18 2 65 -37 36 24 35 37 49 55 35 38 14 38 37 28 5 0 0 37 30 34 1 56 19 3 66 -36 36 48 6 38 13 23 36 1 47 39 0 54 6 0 0 37 53 52 1 56 19 3 66 -35 37 11 26 38 36 39 36 25 8 39 24 8 7 0 0 38 16 57 1 56 19 4 67 -35 37 34 33 38 59 42 36 48 18 39 47 9 8 0 0 38 39 50 1 56 19 5 67 -34 37 57 28 39 22 33 37 11 15 40 9 57 9 0 0 39 2 30 1 56 20 6 68 -33 38 20 10 39 45 10 37 34 0 40 32 32 10 0 0 39 24 56 1 56 20 7 69 -32 38 42 39 40 7 34 37 56 31 40 54 53 11 0 0 39 47 8 1 56 20 8 69 -31 39 4 54 40 29 43 38 18 49 41 16 59 12 0 0 40 9 6 1 56 21 9 70 -30 39 26 54 40 51 38 38 40 52 41 38 50 13 0 0 40 30 49 1 56 21 9 71 -30 39 48 40 41 13 18 39 2 41 42 0 27 14 0 0 40 52 16 1 56 22 10 71 -29 40 10 11 41 34 42 39 24 16 42 21 48 15 0 0 41 13 29 1 56 22 11 72 -28 40 31 27 41 55 51 39 45 35 42 42 53 16 0 0 41 34 25 1 56 23 12 73 -27 40 52 27 42 16 44 40 6 38 43 3 42 17 0 0 41 55 6 1 56 24 13 73 -26 41 13 11 42 37 21 40 27 26 43 24 15 18 0 0 42 15 30 1 56 24 14 74 -26 41 33 38 42 57 42 40 47 58 43 44 31 19 0 0 42 35 37 1 56 25 14 75 -25 41 53 50 43 17 45 41 8 13 44 4 30 20 0 0 42 55 28 1 56 26 15 75 -24 42 13 44 43 37 32 41 28 12 44 24 12 21 0 0 43 15 2 1 56 26 16 76 -23 42 33 22 43 57 1 41 47 54 44 43 37 22 0 0 43 34 18 1 56 27 17 77 -22 42 52 42 44 16 13 42 7 19 45 2 44 23 0 0 43 53 16 1 56 28 17 78 -22 43 11 45 44 35 8 42 26 26 45 21 34 24 0 0 44 11 57 1 56 29 18 78 -21 43 30 30 44 53 44 42 45 16 45 40 5 25 0 0 44 30 20 1 56 30 19 79 -20 43 48 58 45 12 3 43 3 48 45 58 19 26 0 0 44 48 25 1 56 31 20 80 -19 44 7 7 45 30 3 43 22 2 46 16 14 27 0 0 45 6 12 1 56 32 21 81 -19 44 24 58 45 47 45 43 39 58 46 33 51 28 0 0 45 23 41 1 56 33 21 81 -18 44 42 31 46 5 9 43 57 36 46 51 9 29 0 0 45 40 51 1 56 34 22 82 -17 44 59 46 46 22 14 44 14 56 47 8 9 30 0 0 45 57 42 1 56 35 23 83 -16 45 16 42 46 39 1 44 31 58 47 24 51 31 0 0 46 14 15 1 56 36 23 84 -15 45 33 20 46 55 29 44 48 40 47 41 13 32 0 0 46 30 30 1 56 37 24 85 -15 45 49 39 47 11 39 45 5 5 47 57 17 33 0 0 46 46 25 1 56 38 25 85 -14 46 5 40 47 27 29 45 21 10 48 13 2 34 0 0 47 2 2 1 56 39 26 86 -13 46 21 21 47 43 1 45 36 57 48 28 28 35 0 0 47 17 20 1 56 40 26 87 -13 46 36 44 47 58 14 45 52 25 48 43 36 36 0 0 47 32 19 1 56 41 27 88 -12 46 51 48 48 13 8 46 7 34 48 58 24 37 0 0 47 46 59 1 56 43 28 89 -11 47 6 33 48 27 43 46 22 24 49 12 54 38 0 0 48 1 20 1 56 44 28 90 -10 47 20 59 48 41 59 46 36 55 49 27 4 39 0 0 48 15 22 1 56 45 29 91 -10 47 35 6 48 55 57 46 51 8 49 40 56 40 0 0 48 29 6 1 56 46 30 91 -9 47 48 54 49 9 35 47 5 1 49 54 29 41 0 0 48 42 30 1 56 48 30 92 -8 48 2 23 49 22 55 47 18 35 50 7 43 42 0 0 48 55 36 1 56 49 31 93 -8 48 15 34 49 35 55 47 31 51 50 20 38 43 0 0 49 8 22 1 56 50 32 94 -7 48 28 25 49 48 37 47 44 48 50 33 15 44 0 0 49 20 50 1 56 52 32 95 -6 48 40 58 50 1 0 47 57 25 50 45 32 45 0 0 49 32 59 1 56 53 33 96 -6 48 53 12 50 13 5 48 9 44 50 57 31 46 0 0 49 44 50 1 56 54 34 97 -5 49 5 6 50 24 50 48 21 44 51 9 12 47 0 0 49 56 21 1 56 56 34 98 -4 49 16 43 50 36 17 48 33 25 51 20 33 48 0 0 50 7 34 1 56 57 35 99 -3 49 28 0 50 47 25 48 44 47 51 31 36 49 0 0 50 18 29 1 56 58 35 100 -3 49 38 59 50 58 15 48 55 51 51 42 21 50 0 0 50 29 4 1 57 0 36 101 -2 49 49 39 51 8 47 49 6 36 51 52 47 51 0 0 50 39 21 1 57 1 37 102 -1 50 0 0 51 18 59 49 17 2 52 2 55 52 0 0 50 49 20 1 57 3 37 103 -1 50 10 3 51 28 54 49 27 9 52 12 45 53 0 0 50 59 1 1 57 4 38 104 0 50 19 48 51 38 30 49 36 58 52 22 16 Uncertainty in time = +/- 2 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 1390-01056-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 19 14.0515 DE: +20 54 33.933 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 10.7 * B mag [mag]: 10.9 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (92) Undina approx. diameter [km]: 121 approx. diameter ["]: .041 distance from Earth [AU]: 4.03100 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1125 number of rejected observations: 123 time covered by the observations: 1900 Apr 10 - 2012 Mar 24 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.006, 94° remarks: * orbital elements for (92) Undina : Mean anomaly = 118.90416236 deg Arg. of pericenter = 240.27420726 deg Long. of node = 101.58914308 deg Inclination = 9.92986578 deg Eccentricity = 0.10371369 Semimajor axis = 3.18677365 AU Perihelion dist = 2.85626161 AU Mag: H = 6.72, G = 0.15 Epoch of elements : MJD 56178.08200000 TDT (2012 Sep 08.082) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 8 92 Undina 1h 58.8m UT 10.7 8 19 14.052 20 54 33.93TYC 1390-01056-1 10.9 13.0 121 3.3 4.031 3.146 -6.40 107.5631 20.912 149.72 5.59 1.9802 0.06993 0.50899 20.20396 -2.93242 -0.00382 0.00099 2000 117.5039432012 831.00000240.274207101.589143 9.9298660.10371369 3.1867737 2.8562616 6.6 5.00.15 RATE 1.7325160 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.022 90 1.55 0.023 0 0-5 3 056129.0020120908_1056-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org