IOTA/IOTA-ES occultation update for (52) Europa / TYC 6236-01355-1 event on 2012 Sep 07, 20:48 UT Visible from Africa Summary ------- On 2012 Sep 07 UT, the 352 km diameter asteroid (52) Europa will occult a 11.3 mag star in the constellation Ophiuchus for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.5 mag to 12.4 mag (the magnitude of the asteroid) for at most 24.7 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: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2012 Sep 07, 20:46 - 2012 Sep 07, 20:54 UT * geocentric midpoint of event [JD]: 2456178.366875 * magnitude of target star: 11.3 * magnitude drop [mag]: 1.5 * estimated maximum duration [s]: 24.7 * Moon: 57 % sunlit, 169° distance * Sun: 93° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 430 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .029", 91° ) * approx speed of asteroid's shadow [km/s]: 14.2337 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6236-01355-1 by 52 Europa on 2012 Sep 7 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 - 40 0 0 18 29 35 20 46 56 53 182 0 16 23 33 20 39 13 15 36 31 21 29 31 - 39 0 0 18 4 0 20 47 4 53 184 -1 15 58 22 20 13 12 15 11 28 21 3 21 - 38 0 0 17 38 53 20 47 13 54 186 -2 15 33 38 19 47 40 14 46 53 20 37 38 - 37 0 0 17 14 14 20 47 21 54 187 -3 15 9 23 19 22 36 14 22 46 20 12 24 - 36 0 0 16 50 4 20 47 29 54 189 -4 14 45 36 18 58 1 13 59 8 19 47 39 - 35 0 0 16 26 24 20 47 37 55 191 -6 14 22 19 18 33 57 13 35 59 19 23 25 - 34 0 0 16 3 14 20 47 46 55 193 -7 13 59 32 18 10 22 13 13 20 18 59 41 - 33 0 0 15 40 35 20 47 54 55 194 -8 13 37 15 17 47 19 12 51 11 18 36 28 - 32 0 0 15 18 27 20 48 2 55 196 -9 13 15 29 17 24 47 12 29 33 18 13 46 - 31 0 0 14 56 50 20 48 10 55 198 -10 12 54 14 17 2 47 12 8 25 17 51 37 - 30 0 0 14 35 46 20 48 19 55 200 -11 12 33 30 16 41 19 11 47 50 17 30 0 - 29 0 0 14 15 13 20 48 27 55 201 -12 12 13 19 16 20 24 11 27 46 17 8 56 - 28 0 0 13 55 14 20 48 35 55 203 -13 11 53 40 16 0 2 11 8 14 16 48 25 - 27 0 0 13 35 47 20 48 44 55 205 -14 11 34 33 15 40 14 10 49 15 16 28 28 - 26 0 0 13 16 54 20 48 52 55 207 -15 11 16 0 15 21 0 10 30 49 16 9 5 - 25 0 0 12 58 34 20 49 0 54 208 -16 10 58 0 15 2 19 10 12 56 15 50 16 - 24 0 0 12 40 49 20 49 8 54 210 -17 10 40 33 14 44 14 9 55 36 15 32 2 - 23 0 0 12 23 38 20 49 16 54 212 -18 10 23 40 14 26 42 9 38 50 15 14 23 - 22 0 0 12 7 1 20 49 24 54 213 -19 10 7 21 14 9 46 9 22 37 14 57 19 - 21 0 0 11 50 58 20 49 32 53 215 -20 9 51 36 13 53 25 9 6 59 14 40 51 - 20 0 0 11 35 31 20 49 40 53 216 -21 9 36 26 13 37 40 8 51 54 14 24 58 - 19 0 0 11 20 39 20 49 48 52 218 -22 9 21 50 13 22 30 8 37 24 14 9 41 - 18 0 0 11 6 22 20 49 56 52 219 -23 9 7 48 13 7 56 8 23 28 13 55 0 - 17 0 0 10 52 40 20 50 4 52 220 -24 8 54 22 12 53 58 8 10 7 13 40 56 - 16 0 0 10 39 34 20 50 12 51 222 -25 8 41 30 12 40 36 7 57 21 13 27 27 - 15 0 0 10 27 3 20 50 19 51 223 -26 8 29 13 12 27 50 7 45 9 13 14 36 - 14 0 0 10 15 8 20 50 27 50 224 -27 8 17 32 12 15 41 7 33 33 13 2 20 - 13 0 0 10 3 49 20 50 34 49 225 -28 8 6 26 12 4 8 7 22 31 12 50 42 - 12 0 0 9 53 6 20 50 42 49 227 -29 7 55 55 11 53 12 7 12 5 12 39 40 - 11 0 0 9 42 59 20 50 49 48 228 -30 7 45 59 11 42 52 7 2 14 12 29 16 - 10 0 0 9 33 28 20 50 56 47 229 -32 7 36 39 11 33 9 6 52 57 12 19 28 - 9 0 0 9 24 33 20 51 4 47 230 -33 7 27 55 11 24 3 6 44 17 12 10 17 - 8 0 0 9 16 14 20 51 11 46 231 -34 7 19 46 11 15 33 6 36 11 12 1 44 - 7 0 0 9 8 31 20 51 18 45 232 -35 7 12 12 11 7 41 6 28 41 11 53 47 - 6 0 0 9 1 24 20 51 25 45 233 -36 7 5 14 11 0 25 6 21 46 11 46 28 - 5 0 0 8 54 54 20 51 31 44 233 -37 6 58 51 10 53 46 6 15 26 11 39 46 - 4 0 0 8 49 0 20 51 38 43 234 -38 6 53 5 10 47 45 6 9 42 11 33 41 - 3 0 0 8 43 42 20 51 45 42 235 -39 6 47 53 10 42 20 6 4 33 11 28 13 - 2 0 0 8 39 0 20 51 51 42 236 -40 6 43 18 10 37 32 5 59 59 11 23 22 - 1 0 0 8 34 55 20 51 58 41 236 -41 6 39 17 10 33 20 5 56 1 11 19 9 0 0 0 8 31 26 20 52 4 40 237 -42 6 35 53 10 29 46 5 52 38 11 15 33 1 0 0 8 28 33 20 52 10 39 238 -43 6 33 4 10 26 49 5 49 51 11 12 34 2 0 0 8 26 16 20 52 16 38 238 -44 6 30 50 10 24 28 5 47 38 11 10 12 3 0 0 8 24 35 20 52 22 37 239 -45 6 29 12 10 22 45 5 46 1 11 8 27 4 0 0 8 23 30 20 52 28 37 239 -46 6 28 9 10 21 38 5 44 59 11 7 19 5 0 0 8 23 2 20 52 34 36 240 -47 6 27 42 10 21 7 5 44 32 11 6 48 6 0 0 8 23 9 20 52 39 35 240 -47 6 27 50 10 21 14 5 44 41 11 6 54 7 0 0 8 23 52 20 52 45 34 241 -48 6 28 33 10 21 57 5 45 24 11 7 37 8 0 0 8 25 11 20 52 50 33 241 -49 6 29 52 10 23 16 5 46 42 11 8 57 9 0 0 8 27 6 20 52 55 32 242 -50 6 31 45 10 25 12 5 48 35 11 10 53 10 0 0 8 29 36 20 53 0 31 242 -51 6 34 14 10 27 45 5 51 3 11 13 26 11 0 0 8 32 42 20 53 5 30 243 -52 6 37 18 10 30 53 5 54 6 11 16 36 12 0 0 8 36 24 20 53 10 29 243 -53 6 40 56 10 34 38 5 57 43 11 20 22 13 0 0 8 40 41 20 53 15 28 243 -54 6 45 10 10 38 59 6 1 56 11 24 45 14 0 0 8 45 34 20 53 19 28 244 -55 6 49 58 10 43 57 6 6 42 11 29 44 15 0 0 8 51 2 20 53 24 27 244 -56 6 55 21 10 49 30 6 12 3 11 35 19 16 0 0 8 57 5 20 53 28 26 244 -57 7 1 18 10 55 39 6 17 59 11 41 31 17 0 0 9 3 43 20 53 32 25 245 -58 7 7 50 11 2 23 6 24 28 11 48 18 18 0 0 9 10 56 20 53 36 24 245 -58 7 14 56 11 9 44 6 31 32 11 55 41 19 0 0 9 18 44 20 53 40 23 245 -59 7 22 37 11 17 39 6 39 10 12 3 40 20 0 0 9 27 6 20 53 43 22 246 -60 7 30 52 11 26 11 6 47 22 12 12 14 21 0 0 9 36 3 20 53 47 21 246 -61 7 39 40 11 35 17 6 56 7 12 21 24 22 0 0 9 45 35 20 53 50 20 246 -62 7 49 3 11 44 58 7 5 26 12 31 10 23 0 0 9 55 41 20 53 53 19 246 -62 7 58 59 11 55 15 7 15 19 12 41 30 24 0 0 10 6 21 20 53 56 18 247 -63 8 9 29 12 6 6 7 25 45 12 52 26 25 0 0 10 17 35 20 53 59 17 247 -64 8 20 32 12 17 31 7 36 44 13 3 56 26 0 0 10 29 23 20 54 2 16 247 -64 8 32 8 12 29 31 7 48 16 13 16 1 27 0 0 10 41 44 20 54 5 15 247 -65 8 44 18 12 42 5 8 0 22 13 28 40 28 0 0 10 54 39 20 54 7 14 248 -66 8 57 0 12 55 13 8 12 59 13 41 53 29 0 0 11 8 7 20 54 9 13 248 -66 9 10 15 13 8 55 8 26 10 13 55 41 30 0 0 11 22 8 20 54 11 12 248 -67 9 24 2 13 23 10 8 39 52 14 10 2 31 0 0 11 36 41 20 54 13 11 248 -67 9 38 22 13 37 59 8 54 7 14 24 56 32 0 0 11 51 47 20 54 15 10 249 -68 9 53 14 13 53 21 9 8 53 14 40 24 33 0 0 12 7 26 20 54 17 9 249 -68 10 8 37 14 9 15 9 24 11 14 56 25 34 0 0 12 23 36 20 54 18 8 249 -68 10 24 32 14 25 42 9 40 1 15 12 59 35 0 0 12 40 19 20 54 19 7 249 -69 10 40 59 14 42 41 9 56 22 15 30 5 36 0 0 12 57 32 20 54 20 6 249 -69 10 57 56 15 0 13 10 13 13 15 47 43 37 0 0 13 15 17 20 54 21 5 250 -69 11 15 24 15 18 15 10 30 35 16 5 53 38 0 0 13 33 32 20 54 22 4 250 -69 11 33 23 15 36 49 10 48 27 16 24 34 39 0 0 13 52 18 20 54 23 3 250 -69 11 51 51 15 55 54 11 6 49 16 43 47 40 0 0 14 11 35 20 54 23 2 250 -69 12 10 49 16 15 29 11 25 41 17 3 30 41 0 0 14 31 20 20 54 23 1 251 -69 12 30 17 16 35 35 11 45 2 .. .. .. Uncertainty in time = +/- 5 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 6236-01355-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 09 52.3368 DE: -18 31 49.682 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .028 ) * V mag [mag]: 11.3 * B mag [mag]: 11.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (52) Europa approx. diameter [km]: 352 approx. diameter ["]: .151 distance from Earth [AU]: 3.21000 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1940 number of rejected observations: 195 time covered by the observations: 1902 Apr 14 - 2012 Aug 12 1 sigma uncertainty ellipse (major, minor, PA): 0.007, 0.006, 101° remarks: * orbital elements for (52) Europa : Mean anomaly = 158.34206958 deg Arg. of pericenter = 343.99000892 deg Long. of node = 128.72796524 deg Inclination = 7.48105985 deg Eccentricity = 0.10713604 Semimajor axis = 3.09683764 AU Perihelion dist = 2.76505471 AU Mag: H = 6.41, G = 0.18 Epoch of elements : MJD 56177.86700000 TDT (2012 Sep 07.867) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 7 52 Europa 20h 48.3m UT 11.3 17 9 52.337-18 31 49.68TYC 6236-01355-1 11.6 12.4 352 24.7 3.210 1.459 -7.36 -41.9370 -18.528 -132.64 5.67 20.8050 0.19550 0.53933 7.57157 -2.68597 0.00575 -0.00052 2000 156.9192972012 831.00000343.990009128.727965 7.4810600.10713604 3.0968376 2.7650547 6.3 5.00.18 RATE 1.8085330 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.029 91 1.19 0.029 0 0-2-2 056165.0020120907_1355-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org