IOTA/IOTA-ES occultation update for (1417) Walinskia / HIP 46751 event on 2012 Dec 18, 02:46 UT Visible from Europe, Africa Summary ------- On 2012 Dec 18 UT, the 22 km diameter asteroid (1417) Walinskia will occult a 7.4 mag star in the constellation Leo for observers along a path across Europe, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 8.7 mag to 16.1 mag (the magnitude of the asteroid) for at most 4.7 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: . The event at a glimpse ---------------------- * Rank: 22 * date and approx. time of event: 2012 Dec 18, 02:27 - 2012 Dec 18, 03:09 UT * geocentric midpoint of event [JD]: 2456279.61590417 * magnitude of target star: 7.4 * magnitude drop [mag]: 8.7 * estimated maximum duration [s]: 4.7 * Moon: 28 % sunlit, 165° distance * Sun: 127° distance * rough path description: Europe, Africa The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 3.13 * 1 sigma uncertainty interval [seconds]: +/- 10.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .025", 101° ) * approx speed of asteroid's shadow [km/s]: 4.6535 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 46751 by 1417 Walinskia on 2012 Dec 18 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 ' " Longitude Longitude Longitude Longitude 35 14 11 -34 0 0 2 27 57 34 342 0 35 21 50 35 6 32 36 9 46 34 18 44 34 47 18 -33 0 0 2 28 12 35 342 -1 34 54 51 34 39 45 35 42 12 33 52 32 34 20 53 -32 0 0 2 28 26 36 342 -2 34 28 21 34 13 25 35 15 8 33 26 45 33 54 54 -31 0 0 2 28 41 37 342 -2 34 2 17 33 47 32 34 48 33 33 1 23 33 29 20 -30 0 0 2 28 56 38 342 -3 33 36 38 33 22 2 34 22 24 32 36 23 33 4 9 -29 0 0 2 29 12 39 342 -4 33 11 23 32 56 56 33 56 39 32 11 44 32 39 19 -28 0 0 2 29 28 40 343 -5 32 46 28 32 32 10 33 31 18 31 47 25 32 14 49 -27 0 0 2 29 44 41 343 -5 32 21 54 32 7 43 33 6 18 31 23 24 31 50 36 -26 0 0 2 30 1 42 343 -6 31 57 38 31 43 35 32 41 38 30 59 40 31 26 41 -25 0 0 2 30 17 43 343 -7 31 33 39 31 19 44 32 17 16 30 36 11 31 3 2 -24 0 0 2 30 35 44 343 -8 31 9 56 30 56 8 31 53 12 30 12 56 30 39 37 -23 0 0 2 30 52 45 343 -8 30 46 28 30 32 46 31 29 23 29 49 55 30 16 26 -22 0 0 2 31 10 47 343 -9 30 23 14 30 9 38 31 5 50 29 27 6 29 53 27 -21 0 0 2 31 28 48 343 -10 30 0 13 29 46 42 30 42 30 29 4 28 29 30 40 -20 0 0 2 31 46 49 344 -11 29 37 23 29 23 58 30 19 23 28 42 0 29 8 4 -19 0 0 2 32 5 50 344 -11 29 14 43 29 1 24 29 56 28 28 19 42 28 45 37 -18 0 0 2 32 24 51 344 -12 28 52 14 28 38 59 29 33 44 27 57 32 28 23 19 -17 0 0 2 32 43 52 344 -13 28 29 54 28 16 43 29 11 9 27 35 30 28 1 9 -16 0 0 2 33 3 53 344 -14 28 7 42 27 54 35 28 48 44 27 13 35 27 39 6 -15 0 0 2 33 23 54 344 -14 27 45 37 27 32 35 28 26 27 26 51 46 27 17 10 -14 0 0 2 33 43 55 344 -15 27 23 39 27 10 40 28 4 18 26 30 3 26 55 20 -13 0 0 2 34 3 56 344 -16 27 1 47 26 48 52 27 42 16 26 8 24 26 33 35 -12 0 0 2 34 23 57 344 -16 26 40 1 26 27 8 27 20 20 25 46 50 26 11 54 -11 0 0 2 34 44 58 344 -17 26 18 19 26 5 29 26 58 30 25 25 20 25 50 18 -10 0 0 2 35 5 59 344 -18 25 56 42 25 43 54 26 36 44 25 3 52 25 28 45 - 9 0 0 2 35 26 60 344 -19 25 35 8 25 22 22 26 15 3 24 42 27 25 7 15 - 8 0 0 2 35 48 61 344 -19 25 13 36 25 0 53 25 53 26 24 21 4 24 45 47 - 7 0 0 2 36 9 62 344 -20 24 52 8 24 39 26 25 31 52 23 59 42 24 24 20 - 6 0 0 2 36 31 63 344 -21 24 30 40 24 18 0 25 10 20 23 38 21 24 2 55 - 5 0 0 2 36 53 64 344 -21 24 9 15 23 56 36 24 48 50 23 17 0 23 41 31 - 4 0 0 2 37 15 65 344 -22 23 47 50 23 35 12 24 27 22 22 55 39 23 20 6 - 3 0 0 2 37 38 66 344 -23 23 26 25 23 13 48 24 5 55 22 34 17 22 58 42 - 2 0 0 2 38 0 67 344 -23 23 5 0 22 52 23 23 44 28 22 12 54 22 37 16 - 1 0 0 2 38 23 68 344 -24 22 43 34 22 30 58 23 23 2 21 51 30 22 15 49 0 0 0 2 38 46 69 344 -25 22 22 7 22 9 31 23 1 34 21 30 3 21 54 20 1 0 0 2 39 9 70 344 -25 22 0 38 21 48 2 22 40 6 21 8 33 21 32 49 2 0 0 2 39 32 71 344 -26 21 39 7 21 26 30 22 18 37 20 47 0 21 11 15 3 0 0 2 39 56 72 344 -27 21 17 34 21 4 56 21 57 5 20 25 23 20 49 37 4 0 0 2 40 19 73 344 -27 20 55 56 20 43 18 21 35 31 20 3 42 20 27 56 5 0 0 2 40 43 74 344 -28 20 34 16 20 21 36 21 13 53 19 41 56 20 6 10 6 0 0 2 41 6 75 343 -29 20 12 31 19 59 49 20 52 13 19 20 6 19 44 20 7 0 0 2 41 30 76 343 -29 19 50 41 19 37 58 20 30 28 18 58 9 19 22 24 8 0 0 2 41 54 77 343 -30 19 28 46 19 16 1 20 8 39 18 36 6 19 0 22 9 0 0 2 42 18 78 343 -31 19 6 45 18 53 58 19 46 45 18 13 56 18 38 13 10 0 0 2 42 42 79 343 -31 18 44 38 18 31 49 19 24 45 17 51 39 18 15 58 11 0 0 2 43 7 80 342 -32 18 22 24 18 9 32 19 2 40 17 29 14 17 53 35 12 0 0 2 43 31 81 342 -32 18 0 3 17 47 8 18 40 27 17 6 41 17 31 4 13 0 0 2 43 55 83 341 -33 17 37 33 17 24 35 18 18 8 16 43 58 17 8 25 14 0 0 2 44 20 84 341 -34 17 14 56 17 1 54 17 55 41 16 21 5 16 45 36 15 0 0 2 44 44 84 340 -34 16 52 8 16 39 3 17 33 5 15 58 3 16 22 36 16 0 0 2 45 9 85 339 -35 16 29 11 16 16 2 17 10 20 15 34 49 15 59 27 17 0 0 2 45 33 86 337 -35 16 6 4 15 52 50 16 47 26 15 11 23 15 36 5 18 0 0 2 45 58 87 333 -36 15 42 45 15 29 26 16 24 22 14 47 45 15 12 32 19 0 0 2 46 23 88 324 -36 15 19 14 15 5 50 16 1 6 14 23 53 14 48 46 20 0 0 2 46 47 88 278 -37 14 55 30 14 42 1 15 37 39 13 59 48 14 24 46 21 0 0 2 47 12 88 192 -37 14 31 33 14 17 59 15 13 59 13 35 27 14 0 31 22 0 0 2 47 37 87 178 -38 14 7 21 13 53 41 14 50 6 13 10 51 13 36 1 23 0 0 2 48 2 87 173 -38 13 42 54 13 29 8 14 25 59 12 45 58 13 11 15 24 0 0 2 48 26 86 170 -39 13 18 11 13 4 18 14 1 36 12 20 47 12 46 11 25 0 0 2 48 51 85 169 -39 12 53 11 12 39 11 13 36 58 11 55 17 12 20 48 26 0 0 2 49 16 84 168 -40 12 27 52 12 13 44 13 12 2 11 29 28 11 55 6 27 0 0 2 49 40 83 167 -40 12 2 14 11 47 58 12 46 48 11 3 17 11 29 3 28 0 0 2 50 5 82 167 -41 11 36 15 11 21 51 12 21 15 10 36 43 11 2 38 29 0 0 2 50 29 81 166 -41 11 9 54 10 55 21 11 55 22 10 9 46 10 35 49 30 0 0 2 50 54 80 166 -42 10 43 10 10 28 28 11 29 6 9 42 24 10 8 35 31 0 0 2 51 18 79 165 -42 10 16 1 10 1 10 11 2 28 9 14 34 9 40 55 32 0 0 2 51 43 77 165 -42 9 48 26 9 33 24 10 35 25 8 46 17 9 12 47 33 0 0 2 52 7 76 164 -43 9 20 23 9 5 10 10 7 55 8 17 29 8 44 8 34 0 0 2 52 31 75 164 -43 8 51 50 8 36 26 9 39 57 7 48 8 8 14 57 35 0 0 2 52 55 74 164 -43 8 22 45 8 7 9 9 11 30 7 18 14 7 45 12 36 0 0 2 53 20 73 163 -44 7 53 7 7 37 18 8 42 31 6 47 43 7 14 51 37 0 0 2 53 44 72 163 -44 7 22 52 7 6 50 8 12 58 6 16 32 Latitude Latitude Latitude Latitude 6 0 0 39 22 39 2 54 40 70 162 -45 39 38 5 39 7 15 41 15 11 37 31 19 5 0 0 41 11 33 2 55 23 68 162 -45 41 26 45 40 56 23 43 2 24 39 21 52 4 0 0 42 55 38 2 56 3 66 161 -45 43 10 35 42 40 42 44 44 44 41 7 40 3 0 0 44 34 58 2 56 42 64 160 -46 44 49 40 44 20 16 46 22 14 42 48 47 2 0 0 46 9 38 2 57 18 63 160 -46 46 24 5 45 55 12 47 55 2 44 25 16 1 0 0 47 39 45 2 57 51 61 159 -46 47 53 57 47 25 34 49 23 15 45 57 15 0 0 0 49 5 27 2 58 23 59 158 -46 49 19 23 48 51 33 50 47 2 47 24 50 - 1 0 0 50 26 54 2 58 53 58 158 -46 50 40 34 50 13 15 52 6 31 48 48 10 - 2 0 0 51 44 13 2 59 22 57 157 -46 51 57 37 51 30 50 53 21 54 50 7 24 - 3 0 0 52 57 37 2 59 48 55 156 -46 53 10 45 52 44 30 54 33 20 51 22 41 - 4 0 0 54 7 14 3 0 13 54 156 -46 54 20 6 53 54 23 55 41 1 52 34 11 - 5 0 0 55 13 16 3 0 36 53 155 -46 55 25 52 55 0 40 56 45 7 53 42 5 - 6 0 0 56 15 52 3 0 58 52 154 -46 56 28 13 56 3 32 57 45 51 54 46 32 - 7 0 0 57 15 14 3 1 19 50 153 -46 57 27 20 57 3 8 58 43 21 55 47 42 - 8 0 0 58 11 31 3 1 38 49 152 -46 58 23 22 57 59 40 59 37 49 56 45 46 - 9 0 0 59 4 53 3 1 57 48 152 -46 59 16 30 58 53 17 60 29 25 57 40 52 - 10 0 0 59 55 31 3 2 14 47 151 -45 60 6 53 59 44 9 61 18 18 58 33 11 - 11 0 0 60 43 32 3 2 30 47 150 -45 60 54 41 60 32 24 62 4 38 59 22 51 - 12 0 0 61 29 6 3 2 45 46 149 -45 61 40 1 61 18 11 62 48 34 60 10 1 - 13 0 0 62 12 21 3 3 0 45 148 -45 62 23 3 62 1 39 63 30 14 60 54 49 - 14 0 0 62 53 25 3 3 13 44 148 -45 63 3 55 62 42 55 64 9 46 61 37 24 - 15 0 0 63 32 25 3 3 26 43 147 -45 63 42 43 63 22 8 64 47 18 62 17 51 - 16 0 0 64 9 29 3 3 38 42 146 -44 64 19 35 63 59 24 65 22 56 62 56 20 - 17 0 0 64 44 44 3 3 50 42 145 -44 64 54 38 64 34 49 65 56 47 63 32 56 - 18 0 0 65 18 14 3 4 1 41 144 -44 65 27 58 65 8 31 66 28 57 64 7 45 - 19 0 0 65 50 7 3 4 11 40 143 -44 65 59 40 65 40 34 66 59 33 64 40 54 - 20 0 0 66 20 28 3 4 21 40 142 -44 66 29 50 66 11 5 67 28 39 65 12 28 - 21 0 0 66 49 21 3 4 30 39 141 -44 66 58 34 66 40 8 67 56 21 65 42 32 - 22 0 0 67 16 52 3 4 39 39 141 -43 67 25 56 67 7 49 68 22 44 66 11 11 - 23 0 0 67 43 6 3 4 48 38 140 -43 67 52 0 67 34 11 68 47 51 66 38 30 - 24 0 0 68 8 6 3 4 56 37 139 -43 68 16 51 67 59 20 69 11 47 67 4 33 - 25 0 0 68 31 56 3 5 3 37 138 -43 68 40 33 68 23 18 69 34 36 67 29 23 - 26 0 0 68 54 40 3 5 11 36 137 -43 69 3 9 68 46 11 69 56 22 67 53 6 - 27 0 0 69 16 22 3 5 18 36 136 -43 69 24 44 69 8 0 70 17 7 68 15 44 - 28 0 0 69 37 4 3 5 25 35 135 -42 69 45 19 69 28 50 70 36 55 68 37 20 - 29 0 0 69 56 51 3 5 31 35 134 -42 70 4 58 69 48 44 70 55 49 68 57 58 - 30 0 0 70 15 44 3 5 37 34 133 -42 70 23 44 70 7 44 71 13 52 69 17 41 - 31 0 0 70 33 46 3 5 43 34 132 -42 70 41 39 70 25 52 71 31 6 69 36 31 - 32 0 0 70 50 59 3 5 49 34 131 -42 70 58 47 70 43 12 71 47 33 69 54 30 - 33 0 0 71 7 27 3 5 55 33 131 -42 71 15 8 70 59 46 72 3 17 70 11 42 - 34 0 0 71 23 11 3 6 0 33 130 -41 71 30 46 71 15 36 72 18 18 70 28 8 - 35 0 0 71 38 13 3 6 5 32 129 -41 71 45 43 71 30 43 72 32 39 70 43 51 - 36 0 0 71 52 35 3 6 10 32 128 -41 71 59 59 71 45 11 72 46 22 70 58 52 - 37 0 0 72 6 19 3 6 15 32 127 -41 72 13 38 71 59 0 72 59 28 71 13 13 - 38 0 0 72 19 26 3 6 20 31 126 -41 72 26 41 72 12 12 73 11 59 71 26 56 - 39 0 0 72 31 59 3 6 24 31 125 -41 72 39 8 72 24 50 73 23 57 71 40 3 - 40 0 0 72 43 58 3 6 28 30 124 -40 72 51 3 72 36 53 73 35 23 71 52 35 - 41 0 0 72 55 25 3 6 33 30 123 -40 73 2 25 72 48 24 73 46 18 72 4 34 - 42 0 0 73 6 21 3 6 37 30 122 -40 73 13 17 72 59 25 73 56 44 72 16 0 - 43 0 0 73 16 47 3 6 41 29 121 -40 73 23 39 73 9 55 74 6 41 72 26 56 - 44 0 0 73 26 45 3 6 44 29 120 -40 73 33 33 73 19 57 74 16 11 72 37 21 - 45 0 0 73 36 16 3 6 48 29 119 -40 73 43 0 73 29 31 74 25 15 72 47 18 - 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76 0 0 75 43 37 3 8 11 20 90 -36 75 49 32 75 37 42 76 26 33 75 0 41 - 77 0 0 75 43 23 3 8 13 20 89 -36 75 49 18 75 37 28 76 26 20 75 0 27 - 78 0 0 75 42 54 3 8 15 20 88 -35 75 48 49 75 36 59 76 25 52 74 59 56 - 79 0 0 75 42 11 3 8 17 20 87 -35 75 48 6 75 36 15 76 25 11 74 59 11 - 80 0 0 75 41 12 3 8 19 19 86 -35 75 47 8 75 35 16 76 24 15 74 58 9 - 81 0 0 75 39 59 3 8 21 19 85 -35 75 45 55 75 34 2 76 23 5 74 56 52 - 82 0 0 75 38 30 3 8 23 19 84 -35 75 44 27 75 32 33 76 21 41 74 55 20 - 83 0 0 75 36 46 3 8 25 19 83 -35 75 42 44 75 30 49 76 20 2 74 53 31 - 84 0 0 75 34 47 3 8 27 19 82 -35 75 40 46 75 28 49 76 18 9 74 51 26 - 85 0 0 75 32 33 3 8 29 18 81 -35 75 38 32 75 26 34 76 16 1 74 49 5 - 86 0 0 75 30 3 3 8 31 18 80 -34 75 36 3 75 24 3 76 13 38 74 46 28 - 87 0 0 75 27 17 3 8 32 18 79 -34 75 33 18 75 21 15 76 11 0 74 43 34 - 88 0 0 75 24 14 3 8 34 17 78 -34 75 30 17 75 18 12 76 8 6 74 40 23 - 89 0 0 75 20 56 3 8 36 17 77 -34 75 26 59 75 14 52 76 4 57 74 36 54 - 90 0 0 75 17 20 3 8 38 17 76 -34 75 23 26 75 11 15 76 1 32 74 33 9 - 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Uncertainty in time = +/- 15 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: HIP 46751 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 31 43.9708 DE: +20 00 18.370 * position source: mpos:HIP2 pm:HIP2 plx:HIP2 * standard error: RA,DE ["]: ( .016, .009 ) * V mag [mag]: 7.4 * B mag [mag]: 8.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1417) Walinskia approx. diameter [km]: 22 approx. diameter ["]: .012 distance from Earth [AU]: 2.43600 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1181 number of rejected observations: 29 time covered by the observations: 1937 Apr 01 - 2012 Mar 22 1 sigma uncertainty ellipse (major, minor, PA): 0.037, 0.023, 103° remarks: * orbital elements for (1417) Walinskia : Mean anomaly = 228.06629619 deg Arg. of pericenter = 166.62432431 deg Long. of node = 96.03331643 deg Inclination = 8.27241924 deg Eccentricity = 0.07616455 Semimajor axis = 2.97221120 AU Perihelion dist = 2.74583407 AU Mag: H = 10.99, G = 0.15 Epoch of elements : MJD 56279.11600000 TDT (2012 Dec 18.116) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 18 1417 Walinskia 2h 46.9m UT 7.4 9 31 43.971 20 0 18.37HIP 46751 8.7 16.1 22 4.7 2.436 -0.184 9.13 14.0813 20.003 137.44 -23.39 2.7817 0.00712 0.00354 -0.71300 2.52794 -0.00463 0.00121 2000 226.312864201212 9.00000166.624324 96.033316 8.2724190.07616455 2.9722112 2.745834110.9 5.00.15 RATE 1.9234660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.025 101 4.13 0.039 0 0-2 0 456264.0020121218__46751 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 05:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org