IOTA/IOTA-ES occultation update for (2341) Aoluta / TYC 0635-01062-1 event on 2012 Oct 26, 10:03 UT Visible from USA Summary ------- On 2012 Oct 26 UT, the 11 km diameter asteroid (2341) Aoluta will occult a 9.7 mag star in the constellation Aries for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 14.0 mag (the magnitude of the asteroid) for at most 1.6 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: 20 * date and approx. time of event: 2012 Oct 26, 09:49 - 2012 Oct 26, 10:17 UT * geocentric midpoint of event [JD]: 2456226.91911667 * magnitude of target star: 9.7 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 1.6 * Moon: 89 % sunlit, 45° distance * Sun: 173° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 3.29 * 1 sigma uncertainty interval [seconds]: +/- 8.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .086 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .090", .053", 69° ) * approx speed of asteroid's shadow [km/s]: 6.7598 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0635-01062-1 by 2341 Aoluta on 2012 Oct 26 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 115 0 0 21 32 24 10 17 22 1 78 -8 21 35 50 21 28 57 21 58 32 .. .. .. 116 0 0 21 44 28 10 17 22 2 79 -9 21 47 54 21 41 1 22 10 37 .. .. .. 117 0 0 21 56 38 10 17 21 2 79 -10 22 0 5 21 53 12 22 22 48 .. .. .. 118 0 0 22 8 56 10 17 21 3 79 -10 22 12 22 22 5 29 22 35 6 21 42 51 119 0 0 22 21 19 10 17 19 4 80 -11 22 24 46 22 17 52 22 47 30 21 55 14 120 0 0 22 33 49 10 17 18 5 80 -12 22 37 16 22 30 22 23 0 0 22 7 43 121 0 0 22 46 24 10 17 16 6 80 -13 22 49 51 22 42 57 23 12 36 22 20 18 122 0 0 22 59 4 10 17 14 7 81 -14 23 2 32 22 55 37 23 25 17 22 32 58 123 0 0 23 11 50 10 17 12 8 81 -15 23 15 17 23 8 23 23 38 4 22 45 43 124 0 0 23 24 41 10 17 9 9 82 -16 23 28 8 23 21 13 23 50 55 22 58 33 125 0 0 23 37 36 10 17 6 10 82 -17 23 41 3 23 34 8 24 3 50 23 11 27 126 0 0 23 50 35 10 17 3 11 82 -18 23 54 2 23 47 8 24 16 50 23 24 26 127 0 0 24 3 38 10 17 0 12 83 -19 24 7 6 24 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16 18 39 9 29 39 38 46 38 47 8 - 77 0 0 39 5 56 9 51 18 24 265 -20 39 9 20 39 2 31 39 31 49 38 40 9 - 76 0 0 38 58 47 9 51 12 24 265 -19 39 2 11 38 55 22 39 24 40 38 32 59 - 75 0 0 38 51 27 9 51 7 23 266 -18 38 54 52 38 48 2 39 17 21 38 25 39 - 74 0 0 38 43 57 9 51 1 22 267 -17 38 47 22 38 40 32 39 9 52 38 18 8 - 73 0 0 38 36 16 9 50 56 21 267 -17 38 39 41 38 32 51 39 2 12 38 10 26 - 72 0 0 38 28 24 9 50 50 21 268 -16 38 31 49 38 24 59 38 54 21 38 2 34 - 71 0 0 38 20 22 9 50 45 20 269 -15 38 23 47 38 16 57 38 46 19 37 54 31 - 70 0 0 38 12 9 9 50 41 19 269 -14 38 15 35 38 8 44 38 38 7 37 46 18 - 69 0 0 38 3 46 9 50 36 18 270 -13 38 7 12 38 0 21 38 29 45 37 37 54 - 68 0 0 37 55 13 9 50 31 17 271 -13 37 58 38 37 51 48 38 21 12 37 29 20 - 67 0 0 37 46 29 9 50 27 17 271 -12 37 49 55 37 43 4 38 12 29 37 20 35 - 66 0 0 37 37 35 9 50 23 16 272 -11 37 41 1 37 34 10 38 3 36 37 11 40 - 65 0 0 37 28 31 9 50 19 15 273 -10 37 31 56 37 25 5 37 54 33 37 2 35 - 64 0 0 37 19 16 9 50 15 14 273 -10 37 22 42 37 15 51 37 45 19 36 53 20 - 63 0 0 37 9 52 9 50 11 14 274 -9 37 13 18 37 6 26 37 35 55 36 43 55 - 62 0 0 37 0 18 9 50 8 13 275 -8 37 3 44 36 56 52 37 26 22 36 34 20 - 61 0 0 36 50 33 9 50 5 12 275 -7 36 53 59 36 47 7 37 16 38 36 24 35 - 60 0 0 36 40 39 9 50 2 11 276 -6 36 44 5 36 37 13 37 6 45 36 14 40 - 59 0 0 36 30 35 9 49 59 10 276 -5 36 34 2 36 27 9 36 56 42 36 4 35 - 58 0 0 36 20 22 9 49 56 9 277 -5 36 23 48 36 16 56 36 46 29 35 54 21 - 57 0 0 36 9 59 9 49 54 9 278 -4 36 13 25 36 6 33 36 36 7 35 43 57 - 56 0 0 35 59 27 9 49 52 8 278 -3 36 2 53 35 56 0 36 25 35 35 33 24 - 55 0 0 35 48 45 9 49 50 7 279 -2 35 52 12 35 45 18 36 14 55 35 22 42 - 54 0 0 35 37 54 9 49 48 6 279 -1 35 41 21 35 34 27 36 4 4 35 11 50 - 53 0 0 35 26 54 9 49 46 5 280 -1 35 30 21 35 23 27 35 53 5 35 0 49 Uncertainty in time = +/- 9 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 0635-01062-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 32 39.3708 DE: +11 05 31.567 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .025 ) * V mag [mag]: 9.7 * B mag [mag]: 10.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2341) Aoluta approx. diameter [km]: 11 approx. diameter ["]: .017 distance from Earth [AU]: 0.89200 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1014 number of rejected observations: 37 time covered by the observations: 1933 Oct 20 - 2012 Sep 25 1 sigma uncertainty ellipse (major, minor, PA): 0.087, 0.047, 68° remarks: * orbital elements for (2341) Aoluta : Mean anomaly = 350.38736075 deg Arg. of pericenter = 347.62549756 deg Long. of node = 61.62308554 deg Inclination = 4.07483241 deg Eccentricity = 0.15202419 Semimajor axis = 2.21202757 AU Perihelion dist = 1.87574587 AU Mag: H = 12.73, G = 0.15 Epoch of elements : MJD 56226.41900000 TDT (2012 Oct 26.419) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 26 2341 Aoluta 10h 3.5m UT 9.7 2 32 39.371 11 5 31.57TYC 0635-01062-1 10.1 14.0 11 1.6 0.892 -2.539 -4.27 -147.9034 11.095 25.11 -12.65 10.0588 -0.05374 0.46995 -3.79073 -0.43351 -0.00061 0.00015 2000 348.46433320121020.00000347.625498 61.623086 4.0748320.15202419 2.2120276 1.875745912.5 5.00.15 RATE 2.9958370 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.090 0.053 69 4.29 0.056 0 0-2-3 056208.0020121026_1062-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 19:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org