IOTA/IOTA-ES occultation update for (735) Marghanna / TYC 2512-00809-1 event on 2012 Dec 18, 06:45 UT Visible from Brazil Summary ------- On 2012 Dec 18 UT, the 82 km diameter asteroid (735) Marghanna will occult a 10.5 mag star in the constellation Leo Minor for observers along a path across Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.6 mag to 15.1 mag (the magnitude of the asteroid) for at most 10.4 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: 83 * date and approx. time of event: 2012 Dec 18, 06:32 - 2012 Dec 18, 06:58 UT * geocentric midpoint of event [JD]: 2456279.78144583 * magnitude of target star: 10.5 * magnitude drop [mag]: 4.6 * estimated maximum duration [s]: 10.4 * Moon: 30 % sunlit, 155° distance * Sun: 115° distance * rough path description: Brazil The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 6.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .026", 156° ) * approx speed of asteroid's shadow [km/s]: 7.8682 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2512-00809-1 by 735 Marghanna on 2012 Dec 18 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude - 62 41 43 -41 26 47 6 32 21 10 32 -17 - 63 26 40 -41 39 53 - 61 58 27 -41 15 8 - 64 25 16 -41 58 27 - 61 6 50 -41 2 24 - 59 11 8 -36 7 8 6 32 41 16 30 -20 - 59 45 41 -36 12 31 - 58 37 9 -36 2 16 - 60 29 22 -36 19 59 - 57 55 43 -35 56 56 - 57 3 26 -32 9 35 6 33 1 21 29 -22 - 57 34 15 -32 12 30 - 56 32 57 -32 7 2 - 58 12 56 -32 16 35 - 55 55 36 -32 4 19 - 55 30 30 -28 49 35 6 33 21 24 28 -23 - 55 59 13 -28 51 13 - 55 2 2 -28 48 13 - 56 35 10 -28 53 36 - 54 27 1 -28 46 53 - 54 17 22 -25 52 26 6 33 41 27 28 -24 - 54 44 42 -25 53 16 - 53 50 13 -25 51 49 - 55 18 50 -25 54 37 - 53 16 48 -25 51 21 - 53 17 10 -23 11 5 6 34 1 30 27 -26 - 53 43 29 -23 11 22 - 52 50 59 -23 10 58 - 54 16 21 -23 12 0 - 52 18 43 -23 11 6 - 52 26 6 -20 41 27 6 34 20 33 27 -27 - 52 51 41 -20 41 21 - 52 0 40 -20 41 43 - 53 23 34 -20 41 28 - 51 29 16 -20 42 16 - 51 41 54 -18 20 58 6 34 40 35 27 -27 - 52 6 53 -18 20 34 - 51 17 1 -18 21 31 - 52 38 1 -18 20 17 - 50 46 19 -18 22 25 - 51 3 0 -16 7 52 6 35 0 38 27 -28 - 51 27 30 -16 7 13 - 50 38 35 -16 8 38 - 51 58 2 -16 6 38 - 50 8 26 -16 9 48 - 50 28 21 -14 0 51 6 35 20 40 27 -29 - 50 52 28 -14 0 1 - 50 4 18 -14 1 48 - 51 22 31 -13 59 10 - 49 34 36 -14 3 11 - 49 57 10 -11 58 58 6 35 40 42 28 -30 - 50 20 59 -11 57 58 - 49 33 25 -12 0 5 - 50 50 38 -11 56 55 - 49 4 5 -12 1 38 - 49 28 52 -10 1 28 6 36 0 44 28 -31 - 49 52 27 -10 0 21 - 49 5 23 -10 2 43 - 50 21 47 - 9 59 7 - 48 36 20 -10 4 25 - 49 3 2 - 8 7 46 6 36 20 46 28 -31 - 49 26 24 - 8 6 32 - 48 39 44 - 8 9 8 - 49 55 29 - 8 5 9 - 48 10 56 - 8 10 58 - 48 39 17 - 6 17 24 6 36 40 48 29 -32 - 49 2 29 - 6 16 3 - 48 16 9 - 6 18 51 - 49 31 22 - 6 14 32 - 47 47 32 - 6 20 48 - 48 17 21 - 4 29 57 6 37 0 49 29 -32 - 48 40 26 - 4 28 31 - 47 54 20 - 4 31 29 - 49 9 8 - 4 26 53 - 47 25 52 - 4 33 32 - 47 57 0 - 2 45 5 6 37 19 51 30 -33 - 48 19 59 - 2 43 35 - 47 34 4 - 2 46 42 - 48 48 34 - 2 41 50 - 47 5 44 - 2 48 51 - 47 38 2 - 1 2 33 6 37 39 53 30 -33 - 48 0 58 - 1 0 58 - 47 15 11 - 1 4 14 - 48 29 28 - 0 59 8 - 46 46 55 - 1 6 28 - 47 20 19 0 37 55 6 37 59 54 31 -34 - 47 43 12 0 39 34 - 46 57 30 0 36 10 - 48 11 39 0 41 29 - 46 29 17 0 33 52 - 47 3 42 2 16 32 6 38 19 56 32 -34 - 47 26 34 2 18 14 - 46 40 54 2 14 43 - 47 54 59 2 20 14 - 46 12 42 2 12 21 - 46 48 5 3 53 27 6 38 39 57 33 -35 - 47 10 56 3 55 13 - 46 25 16 3 51 35 - 47 39 22 3 57 17 - 45 57 4 3 49 9 - 46 33 21 5 28 51 6 38 59 59 34 -35 - 46 56 14 5 30 41 - 46 10 31 5 26 56 - 47 24 41 5 32 49 - 45 42 16 5 24 26 - 46 19 25 7 2 53 6 39 19 60 35 -35 - 46 42 21 7 4 45 - 45 56 33 7 0 55 - 47 10 51 7 6 57 - 45 28 15 6 58 22 - 46 6 14 8 35 40 6 39 39 62 36 -36 - 46 29 13 8 37 35 - 45 43 17 8 33 39 - 46 57 48 8 39 50 - 45 14 55 8 31 3 - 45 53 42 10 7 19 6 39 59 63 37 -36 - 46 16 46 10 9 17 - 45 30 41 10 5 16 - 46 45 27 10 11 35 - 45 2 13 10 2 36 - 45 41 48 11 37 57 6 40 19 65 39 -36 - 46 4 58 11 39 57 - 45 18 41 11 35 51 - 46 33 46 11 42 19 - 44 50 6 11 33 8 - 45 30 27 13 7 39 6 40 38 66 41 -37 - 45 53 44 13 9 42 - 45 7 14 13 5 31 - 46 22 40 13 12 7 - 44 38 30 13 2 45 - 45 19 38 14 36 31 6 40 58 67 42 -37 - 45 43 2 14 38 36 - 44 56 16 14 34 20 - 46 12 9 14 41 4 - 44 27 23 14 31 31 - 45 9 17 16 4 37 6 41 18 68 45 -37 - 45 32 51 16 6 45 - 44 45 47 16 2 25 - 46 2 8 16 9 16 - 44 16 42 15 59 33 - 44 59 23 17 32 3 6 41 38 70 47 -37 - 45 23 6 17 34 13 - 44 35 42 17 29 48 - 45 52 36 17 36 47 - 44 6 25 17 26 54 - 44 49 53 18 58 53 6 41 58 71 49 -37 - 45 13 48 19 1 5 - 44 26 2 18 56 36 - 45 43 31 19 3 42 - 43 56 31 18 53 39 - 44 40 46 20 25 11 6 42 18 72 52 -38 - 45 4 53 20 27 25 - 44 16 43 20 22 51 - 45 34 52 20 30 5 - 43 46 57 20 19 51 - 44 32 1 21 51 0 6 42 38 73 56 -38 - 44 56 21 21 53 17 - 44 7 44 21 48 39 - 45 26 36 21 55 59 - 43 37 42 21 45 36 - 44 23 35 23 16 25 6 42 58 74 59 -38 - 44 48 10 23 18 44 - 43 59 4 23 14 1 - 45 18 43 23 21 29 - 43 28 44 23 10 56 - 44 15 28 24 41 29 6 43 18 74 64 -38 - 44 40 18 24 43 50 - 43 50 41 24 39 3 - 45 11 11 24 46 38 - 43 20 2 24 35 54 - 44 7 38 26 6 15 6 43 37 75 68 -38 - 44 32 45 26 8 39 - 43 42 34 26 3 47 - 45 3 59 26 11 29 - 43 11 34 26 0 36 - 44 0 4 27 30 48 6 43 57 76 73 -38 - 44 25 29 27 33 13 - 43 34 42 27 28 17 - 44 57 6 27 36 6 - 43 3 20 27 25 3 - 43 52 45 28 55 9 6 44 17 76 79 -38 - 44 18 30 28 57 36 - 43 27 4 28 52 36 - 44 50 31 29 0 32 - 42 55 17 28 49 18 - 43 45 40 30 19 22 6 44 37 77 84 -38 - 44 11 47 30 21 52 - 43 19 38 30 16 46 - 44 44 14 30 24 50 - 42 47 25 30 13 26 - 43 38 49 31 43 30 6 44 57 77 90 -38 - 44 5 18 31 46 3 - 43 12 24 31 40 53 - 44 38 14 31 49 4 - 42 39 44 31 37 29 - 43 32 10 33 7 37 6 45 17 77 97 -38 - 43 59 4 33 10 12 - 43 5 21 33 4 57 - 44 32 30 33 13 16 - 42 32 10 33 1 31 - 43 25 43 34 31 46 6 45 37 77 103 -38 - 43 53 3 34 34 23 - 42 58 27 34 29 3 - 44 27 2 34 37 30 - 42 24 45 34 25 34 - 43 19 27 35 55 59 6 45 57 77 109 -38 - 43 47 15 35 58 39 - 42 51 43 35 53 14 - 44 21 50 36 1 49 - 42 17 26 35 49 41 - 43 13 22 37 20 20 6 46 17 76 115 -38 - 43 41 40 37 23 2 - 42 45 8 37 17 32 - 44 16 53 37 26 15 - 42 10 13 37 13 56 - 43 7 26 38 44 52 6 46 36 76 120 -38 - 43 36 17 38 47 37 - 42 38 40 38 42 1 - 44 12 11 38 50 53 - 42 3 5 38 38 21 - 43 1 40 40 9 38 6 46 56 75 125 -38 - 43 31 7 40 12 25 - 42 32 19 40 6 44 - 44 7 44 40 15 44 - 41 56 1 40 3 1 - 42 56 3 41 34 41 6 47 16 74 130 -38 - 43 26 8 41 37 32 - 42 26 4 41 31 45 - 44 3 32 41 40 54 - 41 49 0 41 27 57 - 42 50 35 43 0 6 6 47 36 73 134 -37 - 43 21 20 43 2 59 - 42 19 55 42 57 6 - 43 59 36 43 6 25 - 41 42 1 42 53 15 - 42 45 14 44 25 55 6 47 56 72 138 -37 - 43 16 44 44 28 51 - 42 13 50 44 22 52 - 43 55 56 44 32 20 - 41 35 2 44 18 57 - 42 40 2 45 52 12 6 48 16 71 141 -37 - 43 12 20 45 55 12 - 42 7 50 45 49 6 - 43 52 32 45 58 44 - 41 28 3 45 45 6 - 42 34 58 47 19 2 6 48 36 70 144 -37 - 43 8 9 47 22 4 - 42 1 54 47 15 52 - 43 49 26 47 25 41 - 41 21 3 47 11 48 - 42 30 1 48 46 28 6 48 56 69 147 -37 - 43 4 9 48 49 33 - 41 56 1 48 43 15 - 43 46 38 48 53 14 - 41 14 0 48 39 5 - 42 25 13 50 14 34 6 49 16 68 149 -36 - 43 0 23 50 17 43 - 41 50 10 50 11 17 - 43 44 10 50 21 28 - 41 6 53 50 7 3 - 42 20 32 51 43 26 6 49 36 67 151 -36 - 42 56 51 51 46 39 - 41 44 21 51 40 5 - 43 42 4 51 50 27 - 40 59 41 51 35 45 - 42 15 59 53 13 7 6 49 55 66 153 -36 - 42 53 33 53 16 24 - 41 38 33 53 9 42 - 43 40 21 53 20 17 - 40 52 21 53 5 17 - 42 11 35 54 43 45 6 50 15 64 155 -35 - 42 50 33 54 47 6 - 41 32 47 54 40 15 - 43 39 6 54 51 3 - 40 44 53 54 35 44 - 42 7 20 56 15 24 6 50 35 63 156 -35 - 42 47 51 56 18 49 - 41 27 0 56 11 50 - 43 38 21 56 22 51 - 40 37 13 56 7 12 - 42 3 16 57 48 11 6 50 55 61 158 -35 - 42 45 31 57 51 40 - 41 21 13 57 44 31 - 43 38 11 57 55 47 - 40 29 20 57 39 47 - 41 59 24 59 22 12 6 51 15 60 159 -34 - 42 43 36 59 25 46 - 41 15 25 59 18 27 - 43 38 42 59 29 58 - 40 21 11 59 13 35 - 41 55 45 60 57 36 6 51 35 59 160 -34 - 42 42 10 61 1 15 - 41 9 35 60 53 46 - 43 40 3 61 5 33 - 40 12 41 60 48 46 - 41 52 24 62 34 31 6 51 55 57 161 -33 - 42 41 20 62 38 16 - 41 3 44 62 30 34 - 43 42 24 62 42 38 - 40 3 47 62 25 26 - 41 49 23 64 13 6 6 52 15 56 162 -33 - 42 41 14 64 16 57 - 40 57 51 64 9 3 - 43 45 58 64 21 25 - 39 54 23 64 3 45 - 41 46 48 65 53 33 6 52 35 54 163 -32 - 42 42 3 65 57 29 - 40 51 55 65 49 23 - 43 51 5 66 2 3 - 39 44 22 65 43 55 - 41 44 48 67 36 3 6 52 54 52 164 -32 - 42 44 4 67 40 6 - 40 45 57 67 31 46 - 43 58 10 67 44 46 - 39 33 35 67 26 6 - 41 43 33 69 20 51 6 53 14 51 165 -31 - 42 47 40 69 25 0 - 40 39 57 69 16 25 - 44 7 52 69 29 46 - 39 21 49 69 10 34 - 41 43 21 71 8 13 6 53 34 49 165 -31 - 42 53 23 71 12 29 - 40 33 57 71 3 38 - 44 21 4 71 17 21 - 39 8 47 70 57 33 - 41 44 39 72 58 27 6 53 54 47 166 -30 - 43 2 6 73 2 50 - 40 27 59 72 53 43 - 44 39 12 73 7 48 - 38 54 2 72 47 22 - 41 48 10 74 51 57 6 54 14 45 167 -30 - 43 15 13 74 56 27 - 40 22 8 74 47 2 - 45 4 30 75 1 29 - 38 36 54 74 40 24 - 41 55 9 76 49 8 6 54 34 43 167 -29 - 43 35 6 76 53 46 - 40 16 34 76 44 2 - 45 40 48 76 58 49 - 38 16 19 76 37 4 - 42 7 55 78 50 34 6 54 54 41 167 -28 - 44 6 7 78 55 17 - 40 11 38 78 45 16 - 46 35 12 79 0 17 - 37 50 17 78 37 55 - 42 31 14 80 56 55 6 55 14 39 167 -27 - 44 57 25 81 1 39 - 40 8 1 80 51 24 - 48 2 24 81 6 26 - 37 14 56 80 43 35 - 43 16 51 83 8 58 6 55 34 37 167 -26 - 46 31 17 83 13 35 - 40 7 36 83 3 18 - 50 38 25 83 17 45 - 36 21 1 82 54 52 - 45 2 44 85 27 44 6 55 53 35 166 -26 - 50 0 6 85 31 41 - 40 16 23 85 22 3 - 56 19 16 85 34 1 - 34 40 13 85 12 48 - 51 34 24 87 53 48 6 56 13 32 159 -25 - 62 27 40 87 54 19 - 41 9 44 87 49 8 - 75 35 23 87 49 1 - 29 40 42 87 38 16 178 57 9 89 15 39 6 56 33 30 30 -23 -170 4 20 88 53 47 150 56 7 89 32 51 -163 55 15 88 24 49 87 1 8 89 31 13 148 49 31 86 31 17 6 56 53 27 0 -22 154 18 56 86 17 51 142 39 25 86 42 12 160 11 4 85 58 16 134 10 35 86 51 45 145 31 16 83 21 36 6 57 13 24 357 -21 148 35 17 83 8 35 142 15 51 83 33 0 152 6 57 82 50 21 137 59 4 83 44 44 144 27 36 79 44 3 6 57 33 20 357 -19 146 29 51 79 29 39 142 20 1 79 57 7 148 53 44 79 10 0 139 34 55 80 11 24 144 6 48 75 20 28 6 57 53 16 356 -18 145 34 20 75 2 35 142 36 4 75 36 57 147 18 13 74 38 28 140 39 22 75 55 30 144 12 28 69 12 3 6 58 13 10 357 -15 145 16 26 68 42 46 143 6 5 69 38 42 146 32 9 68 2 14 141 40 38 70 8 31 Uncertainty in time = +/- 7 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 2512-00809-1 * constellation : Leo Minor * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 38 59.0981 DE: +30 38 16.127 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .019 ) * V mag [mag]: 10.5 * B mag [mag]: 11.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (735) Marghanna approx. diameter [km]: 82 approx. diameter ["]: .042 distance from Earth [AU]: 2.70100 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1034 number of rejected observations: 54 time covered by the observations: 1912 Dec 09 - 2012 Nov 29 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.018, 135° remarks: * orbital elements for (735) Marghanna : Mean anomaly = 111.06909779 deg Arg. of pericenter = 310.13993525 deg Long. of node = 42.98218587 deg Inclination = 16.88712680 deg Eccentricity = 0.32281000 Semimajor axis = 2.72686553 AU Perihelion dist = 1.84660608 AU Mag: H = 9.63, G = 0.15 Epoch of elements : MJD 56279.28200000 TDT (2012 Dec 18.282) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 18 735 Marghanna 6h 45.3m UT 10.5 10 38 59.098 30 38 16.13TYC 2512-00809-1 11.4 15.1 82 10.4 2.701 0.279 14.01 -28.8640 30.634 77.86 -23.40 6.7547 -0.21496 0.05584 1.11022 4.30003 -0.00533 0.00125 2000 109.037443201212 9.00000310.139935 42.982186 16.8871270.32281000 2.7268655 1.8466061 9.6 5.00.15 RATE 2.1888120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.026 156 1.62 0.026 0 0 1-3 056264.0020121218_0809-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 23:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org