IOTA/IOTA-ES occultation update for (197) Arete / UCAC2 39273108 event on 2012 Nov 09, 22:04 UT Visible from Africa Summary ------- On 2012 Nov 09 UT, the 33 km diameter asteroid (197) Arete will occult a 12.0 mag star in the constellation Taurus 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 1.8 mag to 13.5 mag (the magnitude of the asteroid) for at most 3.9 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 22 * date and approx. time of event: 2012 Nov 09, 21:56 - 2012 Nov 09, 22:12 UT * geocentric midpoint of event [JD]: 2456241.4196375 * magnitude of target star: 12.0 * magnitude drop [mag]: 1.8 * estimated maximum duration [s]: 3.9 * Moon: 21 % sunlit, 89° distance * Sun: 144° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 48 * 1 sigma uncertainty interval [path widths]: +/- 3.06 * 1 sigma uncertainty interval [seconds]: +/- 11.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .074 +/- .073) * 1 sigma uncertainty ellipse (major, minor, PA): ( .074", .073", 89° ) * approx speed of asteroid's shadow [km/s]: 8.4953 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 39273108 by 197 Arete on 2012 Nov 9 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 - 15 0 0 -32 38 16 22 12 48 0 65 -29 -32 23 34 .. .. .. .. .. .. .. .. .. - 14 0 0 -32 14 31 22 12 48 1 64 -29 -31 59 52 -32 29 14 .. .. .. -34 1 2 - 13 0 0 -31 51 11 22 12 47 2 64 -30 -31 36 36 -32 5 51 .. .. .. -33 37 14 - 12 0 0 -31 28 18 22 12 46 3 63 -31 -31 13 47 -31 42 54 .. .. .. -33 13 54 - 11 0 0 -31 5 53 22 12 45 4 63 -32 -30 51 25 -31 20 25 .. .. .. -32 51 2 - 10 0 0 -30 43 55 22 12 44 5 62 -33 -30 29 31 -30 58 23 .. .. .. -32 28 37 - 9 0 0 -30 22 25 22 12 43 6 62 -34 -30 8 4 -30 36 50 .. .. .. -32 6 41 - 8 0 0 -30 1 23 22 12 41 7 61 -34 -29 47 6 -30 15 45 .. .. .. -31 45 14 - 7 0 0 -29 40 51 22 12 39 7 61 -35 -29 26 36 -29 55 9 -28 0 55 -31 24 17 - 6 0 0 -29 20 47 22 12 36 8 60 -36 -29 6 36 -29 35 2 -27 41 13 -31 3 48 - 5 0 0 -29 1 13 22 12 33 9 60 -37 -28 47 5 -29 15 24 -27 22 1 -30 43 50 - 4 0 0 -28 42 8 22 12 30 10 59 -37 -28 28 3 -28 56 17 -27 3 17 -30 24 22 - 3 0 0 -28 23 34 22 12 27 11 59 -38 -28 9 32 -28 37 39 -26 45 3 -30 5 25 - 2 0 0 -28 5 29 22 12 24 12 58 -39 -27 51 31 -28 19 32 -26 27 19 -29 46 58 - 1 0 0 -27 47 56 22 12 20 13 58 -40 -27 34 0 -28 1 55 -26 10 5 -29 29 3 0 0 0 -27 30 52 22 12 16 14 57 -40 -27 16 59 -27 44 49 -25 53 21 -29 11 39 1 0 0 -27 14 20 22 12 12 15 57 -41 -27 0 30 -27 28 14 -25 37 8 -28 54 46 2 0 0 -26 58 19 22 12 7 15 56 -42 -26 44 32 -27 12 11 -25 21 25 -28 38 25 3 0 0 -26 42 49 22 12 2 16 56 -42 -26 29 4 -26 56 38 -25 6 12 -28 22 36 4 0 0 -26 27 51 22 11 57 17 55 -43 -26 14 8 -26 41 37 -24 51 31 -28 7 18 5 0 0 -26 13 24 22 11 52 18 55 -43 -25 59 44 -26 27 8 -24 37 20 -27 52 33 6 0 0 -25 59 29 22 11 46 19 54 -44 -25 45 51 -26 13 10 -24 23 41 -27 38 21 7 0 0 -25 46 5 22 11 41 20 53 -44 -25 32 29 -25 59 44 -24 10 33 -27 24 40 8 0 0 -25 33 13 22 11 35 21 53 -45 -25 19 40 -25 46 51 -23 57 56 -27 11 32 9 0 0 -25 20 54 22 11 28 21 52 -45 -25 7 22 -25 34 29 -23 45 50 -26 58 57 10 0 0 -25 9 6 22 11 22 22 52 -46 -24 55 37 -25 22 39 -23 34 16 -26 46 54 11 0 0 -24 57 50 22 11 15 23 51 -46 -24 44 23 -25 11 21 -23 23 14 -26 35 25 12 0 0 -24 47 7 22 11 8 24 51 -47 -24 33 41 -25 0 36 -23 12 43 -26 24 27 13 0 0 -24 36 56 22 11 1 25 50 -47 -24 23 32 -24 50 23 -23 2 43 -26 14 3 14 0 0 -24 27 17 22 10 54 25 49 -48 -24 13 54 -24 40 42 -22 53 16 -26 4 12 15 0 0 -24 18 10 22 10 47 26 49 -48 -24 4 49 -24 31 34 -22 44 20 -25 54 53 16 0 0 -24 9 35 22 10 39 27 48 -48 -23 56 16 -24 22 58 -22 35 55 -25 46 8 17 0 0 -24 1 33 22 10 31 28 47 -48 -23 48 15 -24 14 54 -22 28 3 -25 37 55 18 0 0 -23 54 3 22 10 23 28 47 -49 -23 40 47 -24 7 23 -22 20 42 -25 30 15 19 0 0 -23 47 6 22 10 15 29 46 -49 -23 33 50 -24 0 24 -22 13 52 -25 23 8 20 0 0 -23 40 40 22 10 6 30 45 -49 -23 27 26 -23 53 58 -22 7 35 -25 16 35 21 0 0 -23 34 47 22 9 58 31 45 -49 -23 21 34 -23 48 4 -22 1 49 -25 10 34 22 0 0 -23 29 27 22 9 49 31 44 -49 -23 16 15 -23 42 42 -21 56 35 -25 5 6 23 0 0 -23 24 39 22 9 40 32 43 -50 -23 11 27 -23 37 53 -21 51 53 -25 0 11 24 0 0 -23 20 22 22 9 31 33 43 -50 -23 7 12 -23 33 36 -21 47 42 -24 55 49 25 0 0 -23 16 39 22 9 22 33 42 -50 -23 3 29 -23 29 52 -21 44 3 -24 52 0 26 0 0 -23 13 27 22 9 12 34 41 -50 -23 0 18 -23 26 39 -21 40 56 -24 48 43 27 0 0 -23 10 48 22 9 3 34 40 -50 -22 57 39 -23 23 59 -21 38 21 -24 46 0 28 0 0 -23 8 40 22 8 53 35 39 -50 -22 55 32 -23 21 52 -21 36 16 -24 43 49 29 0 0 -23 7 5 22 8 43 36 38 -49 -22 53 57 -23 20 16 -21 34 44 -24 42 11 30 0 0 -23 6 2 22 8 33 36 38 -49 -22 52 55 -23 19 13 -21 33 43 -24 41 6 31 0 0 -23 5 31 22 8 23 37 37 -49 -22 52 24 -23 18 42 -21 33 13 -24 40 33 32 0 0 -23 5 32 22 8 13 37 36 -49 -22 52 25 -23 18 42 -21 33 15 -24 40 33 33 0 0 -23 6 5 22 8 3 38 35 -49 -22 52 58 -23 19 15 -21 33 48 -24 41 5 34 0 0 -23 7 10 22 7 52 38 34 -49 -22 54 3 -23 20 20 -21 34 53 -24 42 11 35 0 0 -23 8 46 22 7 42 39 33 -48 -22 55 39 -23 21 57 -21 36 29 -24 43 48 36 0 0 -23 10 55 22 7 31 39 32 -48 -22 57 47 -23 24 5 -21 38 36 -24 45 58 37 0 0 -23 13 35 22 7 21 39 31 -48 -23 0 27 -23 26 46 -21 41 14 -24 48 40 38 0 0 -23 16 46 22 7 10 40 30 -47 -23 3 38 -23 29 58 -21 44 23 -24 51 55 39 0 0 -23 20 30 22 6 59 40 29 -47 -23 7 21 -23 33 42 -21 48 3 -24 55 41 40 0 0 -23 24 45 22 6 48 41 28 -47 -23 11 35 -23 37 57 -21 52 14 -25 0 0 41 0 0 -23 29 31 22 6 37 41 27 -46 -23 16 21 -23 42 44 -21 56 56 -25 4 51 42 0 0 -23 34 48 22 6 26 41 26 -46 -23 21 38 -23 48 2 -22 2 9 -25 10 14 43 0 0 -23 40 37 22 6 15 42 25 -45 -23 27 26 -23 53 52 -22 7 53 -25 16 9 44 0 0 -23 46 57 22 6 3 42 23 -45 -23 33 45 -24 0 13 -22 14 7 -25 22 35 45 0 0 -23 53 49 22 5 52 42 22 -44 -23 40 36 -24 7 5 -22 20 52 -25 29 33 46 0 0 -24 1 11 22 5 41 42 21 -44 -23 47 57 -24 14 28 -22 28 7 -25 37 3 47 0 0 -24 9 4 22 5 29 42 20 -43 -23 55 49 -24 22 22 -22 35 52 -25 45 5 48 0 0 -24 17 28 22 5 18 43 19 -43 -24 4 12 -24 30 48 -22 44 8 -25 53 38 49 0 0 -24 26 23 22 5 6 43 18 -42 -24 13 5 -24 39 44 -22 52 54 -26 2 42 50 0 0 -24 35 48 22 4 55 43 16 -42 -24 22 29 -24 49 10 -23 2 10 -26 12 17 51 0 0 -24 45 44 22 4 43 43 15 -41 -24 32 23 -24 59 7 -23 11 57 -26 22 24 52 0 0 -24 56 10 22 4 32 43 14 -40 -24 42 48 -25 9 35 -23 22 12 -26 33 1 53 0 0 -25 7 6 22 4 20 43 13 -40 -24 53 43 -25 20 33 -23 32 58 -26 44 9 54 0 0 -25 18 33 22 4 9 43 11 -39 -25 5 8 -25 32 1 -23 44 13 -26 55 48 55 0 0 -25 30 29 22 3 57 43 10 -38 -25 17 2 -25 43 59 -23 55 58 -27 7 58 56 0 0 -25 42 56 22 3 46 43 9 -38 -25 29 27 -25 56 28 -24 8 12 -27 20 38 57 0 0 -25 55 52 22 3 34 43 8 -37 -25 42 21 -26 9 26 -24 20 55 -27 33 48 58 0 0 -26 9 17 22 3 23 43 7 -36 -25 55 45 -26 22 53 -24 34 7 -27 47 28 59 0 0 -26 23 12 22 3 11 42 5 -36 -26 9 37 -26 36 50 -24 47 48 -28 1 39 60 0 0 -26 37 36 22 3 0 42 4 -35 -26 23 59 -26 51 16 -25 1 57 -28 16 18 61 0 0 -26 52 29 22 2 48 42 3 -34 -26 38 50 -27 6 11 -25 16 35 -28 31 28 62 0 0 -27 7 50 22 2 37 42 2 -33 -26 54 9 -27 21 35 -25 31 41 -28 47 7 63 0 0 -27 23 41 22 2 25 42 0 -33 -27 9 57 -27 37 28 -25 47 15 -29 3 15 64 0 0 -27 39 59 22 2 14 41 359 -32 -27 26 14 -27 53 49 -26 3 18 -29 19 52 65 0 0 -27 56 46 22 2 3 41 358 -31 -27 42 58 -28 10 38 -26 19 47 -29 36 57 66 0 0 -28 14 1 22 1 52 41 357 -30 -28 0 10 -28 27 55 -26 36 44 -29 54 31 67 0 0 -28 31 43 22 1 40 40 356 -29 -28 17 49 -28 45 40 -26 54 9 -30 12 33 68 0 0 -28 49 53 22 1 29 40 355 -28 -28 35 56 -29 3 53 -27 12 0 -30 31 3 69 0 0 -29 8 29 22 1 18 40 354 -28 -28 54 30 -29 22 32 -27 30 18 -30 50 1 70 0 0 -29 27 33 22 1 7 39 352 -27 -29 13 31 -29 41 38 -27 49 2 -31 9 26 71 0 0 -29 47 2 22 0 57 39 351 -26 -29 32 58 -30 1 11 -28 8 12 -31 29 17 72 0 0 -30 6 58 22 0 46 38 350 -25 -29 52 51 -30 21 10 -28 27 48 -31 49 36 73 0 0 -30 27 20 22 0 35 38 349 -24 -30 13 10 -30 41 35 -28 47 49 -32 10 20 74 0 0 -30 48 7 22 0 25 37 348 -23 -30 33 54 -31 2 25 -29 8 15 -32 31 31 75 0 0 -31 9 20 22 0 15 37 347 -23 -30 55 3 -31 23 41 -29 29 6 -32 53 7 76 0 0 -31 30 57 22 0 4 36 346 -22 -31 16 37 -31 45 21 -29 50 21 -33 15 8 77 0 0 -31 52 58 21 59 54 36 345 -21 -31 38 34 -32 7 25 -30 12 0 -33 37 34 78 0 0 -32 15 23 21 59 44 35 344 -20 -32 0 56 -32 29 54 -30 34 2 -34 0 24 79 0 0 -32 38 11 21 59 34 35 343 -19 -32 23 41 -32 52 46 -30 56 28 -34 23 38 80 0 0 -33 1 22 21 59 25 34 342 -18 -32 46 49 -33 16 0 -31 19 16 -34 47 15 81 0 0 -33 24 56 21 59 15 33 341 -17 -33 10 19 -33 39 37 -31 42 26 -35 11 15 82 0 0 -33 48 52 21 59 6 33 340 -16 -33 34 11 -34 3 36 -32 5 58 -35 35 37 83 0 0 -34 13 8 21 58 57 32 339 -16 -33 58 25 -34 27 57 -32 29 51 -36 0 20 84 0 0 -34 37 46 21 58 48 31 338 -15 -34 22 59 -34 52 38 -32 54 4 -36 25 25 85 0 0 -35 2 44 21 58 39 31 337 -14 -34 47 53 -35 17 40 -33 18 38 -36 50 50 86 0 0 -35 28 1 21 58 30 30 337 -13 -35 13 7 -35 43 1 -33 43 31 -37 16 35 87 0 0 -35 53 38 21 58 22 29 336 -12 -35 38 40 -36 8 41 -34 8 43 -37 42 39 88 0 0 -36 19 33 21 58 13 29 335 -11 -36 4 31 -36 34 40 -34 34 13 -38 9 2 89 0 0 -36 45 45 21 58 5 28 334 -10 -36 30 40 -37 0 56 -35 0 1 -38 35 43 90 0 0 -37 12 15 21 57 57 27 333 -9 -36 57 6 -37 27 29 -35 26 5 -39 2 40 91 0 0 -37 39 1 21 57 50 26 332 -8 -37 23 48 -37 54 19 -35 52 26 -39 29 54 92 0 0 -38 6 2 21 57 42 26 331 -8 -37 50 45 -38 21 24 -36 19 2 -39 57 23 93 0 0 -38 33 18 21 57 35 25 331 -7 -38 17 58 -38 48 43 -36 45 54 -40 25 7 94 0 0 -39 0 48 21 57 28 24 330 -6 -38 45 24 -39 16 17 -37 12 59 -40 53 5 95 0 0 -39 28 31 21 57 21 23 329 -5 -39 13 4 -39 44 4 -37 40 17 -41 21 16 96 0 0 -39 56 26 21 57 14 23 328 -4 -39 40 55 -40 12 3 -38 7 48 -41 49 39 97 0 0 -40 24 33 21 57 8 22 328 -3 -40 8 59 -40 40 14 -38 35 31 -42 18 13 98 0 0 -40 52 51 21 57 2 21 327 -2 -40 37 13 -41 8 35 -39 3 24 -42 46 58 99 0 0 -41 21 18 21 56 56 20 326 -1 -41 5 36 -41 37 5 -39 31 28 -43 15 52 100 0 0 -41 49 54 21 56 50 19 325 -1 -41 34 9 -42 5 45 -39 59 41 -43 44 54 Uncertainty in time = +/- 12 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: UCAC2 39273108 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 33 05.2258 DE: +21 03 06.808 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .072, .072 ) * V mag [mag]: 12.0 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (197) Arete approx. diameter [km]: 33 approx. diameter ["]: .024 distance from Earth [AU]: 1.91000 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1367 number of rejected observations: 87 time covered by the observations: 1906 May 29 - 2012 Oct 21 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.012, 78° remarks: * orbital elements for (197) Arete : Mean anomaly = 84.61610726 deg Arg. of pericenter = 246.79390456 deg Long. of node = 81.63480431 deg Inclination = 8.79610049 deg Eccentricity = 0.16136810 Semimajor axis = 2.74299171 AU Perihelion dist = 2.30036036 AU Mag: H = 9.40, G = 0.15 Epoch of elements : MJD 56240.92000000 TDT (2012 Nov 09.920) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 9 197 Arete 22h 4.3m UT 12.0 5 33 5.226 21 3 6.81UCAC2 39273108 0.0 13.5 33 3.9 1.910 -1.544 4.56 62.7250 21.050 -155.09 -17.17 22.0713 -0.15117 -0.71542 -4.69148 0.99094 -0.00349 0.00003 2000 84.416509201211 9.00000246.793905 81.634804 8.7961000.16136810 2.7429917 2.3003603 9.2 5.00.15 RATE 2.1695390 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.074 0.073 89 4.06 0.073 0 0-2-2 056226.0020121109_273108 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 22:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org