IOTA/IOTA-ES occultation update for (2908) Shimoyama / TYC 1257-00154-1 event on 2012 Nov 07, 01:26 UT Visible from Europe, Russia, Brazil, Bolivia Summary ------- On 2012 Nov 07 UT, the 31 km diameter asteroid (2908) Shimoyama will occult a 9.8 mag star in the constellation Taurus for observers along a path across Europe, Russia, Brazil, Bolivia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.2 mag (the magnitude of the asteroid) for at most 2.8 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: 26 * date and approx. time of event: 2012 Nov 07, 01:17 - 2012 Nov 07, 01:36 UT * geocentric midpoint of event [JD]: 2456238.56005 * magnitude of target star: 9.8 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 2.8 * Moon: 49 % sunlit, 74° distance * Sun: 164° distance * rough path description: Europe, Russia, Brazil, Bolivia The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 2.56 * 1 sigma uncertainty interval [seconds]: +/- 7.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .085 +/- .058) * 1 sigma uncertainty ellipse (major, minor, PA): ( .085", .058", 91° ) * approx speed of asteroid's shadow [km/s]: 10.8983 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1257-00154-1 by 2908 Shimoyama on 2012 Nov 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 ' " Longitude Longitude Longitude Longitude - 90 38 44 -27 0 0 1 36 7 0 68 -16 ... .. .. - 90 14 4 ... .. .. - 88 11 22 - 88 2 41 -26 0 0 1 36 6 3 66 -18 - 88 25 55 - 87 39 39 - 90 28 16 - 85 44 35 Latitude Latitude Latitude Latitude - 88 0 0 -25 58 55 1 36 6 3 66 -18 -25 49 40 -26 8 11 -25 2 12 -26 55 31 - 87 0 0 -25 34 32 1 36 6 4 66 -19 -25 25 14 -25 43 50 -24 37 34 -26 31 22 - 86 0 0 -25 9 25 1 36 5 5 66 -20 -25 0 5 -25 18 45 -24 12 12 -26 6 30 - 85 0 0 -24 43 35 1 36 4 6 65 -21 -24 34 12 -24 52 57 -23 46 6 -25 40 55 - 84 0 0 -24 17 0 1 36 3 7 65 -22 -24 7 35 -24 26 26 -23 19 16 -25 14 37 - 83 0 0 -23 49 42 1 36 2 8 64 -23 -23 40 14 -23 59 10 -22 51 41 -24 47 35 - 82 0 0 -23 21 40 1 36 0 9 64 -24 -23 12 9 -23 31 11 -22 23 23 -24 19 48 - 81 0 0 -22 52 53 1 35 59 10 64 -25 -22 43 20 -23 2 27 -21 54 20 -23 51 18 - 80 0 0 -22 23 23 1 35 57 11 63 -26 -22 13 46 -22 32 59 -21 24 32 -23 22 4 - 79 0 0 -21 53 7 1 35 55 12 63 -27 -21 43 28 -22 2 46 -20 54 0 -22 52 6 - 78 0 0 -21 22 8 1 35 52 13 62 -28 -21 12 26 -21 31 49 -20 22 43 -22 21 23 - 77 0 0 -20 50 23 1 35 50 14 62 -29 -20 40 39 -21 0 8 -19 50 42 -21 49 56 - 76 0 0 -20 17 55 1 35 47 15 62 -30 -20 8 7 -20 27 42 -19 17 56 -21 17 44 - 75 0 0 -19 44 42 1 35 44 16 61 -31 -19 34 52 -19 54 32 -18 44 26 -20 44 48 - 74 0 0 -19 10 44 1 35 41 17 61 -33 -19 0 51 -19 20 37 -18 10 11 -20 11 8 - 73 0 0 -18 36 3 1 35 37 18 61 -34 -18 26 7 -18 45 59 -17 35 12 -19 36 44 - 72 0 0 -18 0 38 1 35 34 19 61 -35 -17 50 39 -18 10 36 -16 59 29 -19 1 36 - 71 0 0 -17 24 28 1 35 30 20 60 -36 -17 14 27 -17 34 30 -16 23 2 -18 25 45 - 70 0 0 -16 47 36 1 35 26 22 60 -37 -16 37 32 -16 57 40 -15 45 52 -17 49 10 - 69 0 0 -16 10 1 1 35 21 23 60 -38 -15 59 53 -16 20 8 -15 7 59 -17 11 52 - 68 0 0 -15 31 42 1 35 17 24 60 -39 -15 21 32 -15 41 52 -14 29 24 -16 33 51 - 67 0 0 -14 52 42 1 35 12 25 59 -40 -14 42 29 -15 2 55 -13 50 6 -15 55 8 - 66 0 0 -14 13 1 1 35 7 26 59 -42 -14 2 45 -14 23 16 -13 10 7 -15 15 44 - 65 0 0 -13 32 38 1 35 1 27 59 -43 -13 22 19 -13 42 56 -12 29 27 -14 35 38 - 64 0 0 -12 51 35 1 34 56 28 59 -44 -12 41 13 -13 1 56 -11 48 7 -13 54 51 - 63 0 0 -12 9 52 1 34 50 30 59 -45 -11 59 28 -12 20 16 -11 6 8 -13 13 25 - 62 0 0 -11 27 31 1 34 44 31 58 -46 -11 17 4 -11 37 57 -10 23 30 -12 31 20 - 61 0 0 -10 44 31 1 34 37 32 58 -47 -10 34 2 -10 55 1 - 9 40 15 -11 48 37 - 60 0 0 -10 0 55 1 34 31 33 58 -49 - 9 50 23 -10 11 27 - 8 56 22 -11 5 17 - 59 0 0 - 9 16 43 1 34 24 34 58 -50 - 9 6 9 - 9 27 17 - 8 11 55 -10 21 20 - 58 0 0 - 8 31 56 1 34 17 36 58 -51 - 8 21 19 - 8 42 33 - 7 26 53 - 9 36 49 - 57 0 0 - 7 46 36 1 34 9 37 58 -52 - 7 35 56 - 7 57 15 - 6 41 17 - 8 51 43 - 56 0 0 - 7 0 43 1 34 2 38 58 -53 - 6 50 1 - 7 11 24 - 5 55 10 - 8 6 4 - 55 0 0 - 6 14 19 1 33 54 39 58 -55 - 6 3 35 - 6 25 3 - 5 8 32 - 7 19 54 - 54 0 0 - 5 27 25 1 33 45 40 58 -56 - 5 16 39 - 5 38 11 - 4 21 24 - 6 33 14 - 53 0 0 - 4 40 3 1 33 37 42 58 -57 - 4 29 15 - 4 50 51 - 3 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55 23 63 0 0 49 45 33 1 18 0 28 268 -15 49 54 1 49 37 5 50 37 23 48 53 49 64 0 0 49 43 34 1 17 57 27 269 -14 49 52 2 49 35 6 50 35 26 48 51 49 65 0 0 49 41 9 1 17 54 27 270 -13 49 49 37 49 32 40 50 33 3 48 49 21 66 0 0 49 38 16 1 17 51 26 270 -13 49 46 45 49 29 48 50 30 13 48 46 26 67 0 0 49 34 57 1 17 48 25 271 -12 49 43 27 49 26 28 50 26 57 48 43 4 68 0 0 49 31 11 1 17 45 25 272 -11 49 39 41 49 22 41 50 23 14 48 39 15 69 0 0 49 26 58 1 17 42 24 273 -11 49 35 28 49 18 28 50 19 4 48 34 58 70 0 0 49 22 17 1 17 39 24 274 -10 49 30 48 49 13 46 50 14 28 48 30 13 71 0 0 49 17 9 1 17 37 23 274 -9 49 25 41 49 8 37 50 9 24 48 25 0 72 0 0 49 11 33 1 17 34 22 275 -9 49 20 6 49 3 1 50 3 53 48 19 19 73 0 0 49 5 29 1 17 32 22 276 -8 49 14 3 48 56 56 49 57 55 48 13 10 74 0 0 48 58 57 1 17 29 21 277 -7 49 7 32 48 50 23 49 51 29 48 6 33 75 0 0 48 51 57 1 17 27 20 277 -7 49 0 33 48 43 22 49 44 35 47 59 26 76 0 0 48 44 28 1 17 24 20 278 -6 48 53 5 48 35 52 49 37 13 47 51 51 77 0 0 48 36 30 1 17 22 19 279 -5 48 45 8 48 27 53 49 29 22 47 43 46 78 0 0 48 28 4 1 17 20 18 280 -5 48 36 42 48 19 25 49 21 2 47 35 11 79 0 0 48 19 7 1 17 18 18 280 -4 48 27 47 48 10 27 49 12 14 47 26 7 80 0 0 48 9 41 1 17 16 17 281 -3 48 18 22 48 0 59 49 2 56 47 16 33 81 0 0 47 59 45 1 17 14 16 282 -3 48 8 28 47 51 2 48 53 8 47 6 28 82 0 0 47 49 18 1 17 12 16 283 -2 47 58 2 47 40 33 48 42 51 46 55 52 83 0 0 47 38 20 1 17 10 15 283 -1 47 47 6 47 29 34 48 32 2 46 44 45 84 0 0 47 26 51 1 17 8 14 284 -1 47 35 39 47 18 4 48 20 44 46 33 6 85 0 0 47 14 51 1 17 6 13 285 0 47 23 40 47 6 2 48 8 53 46 20 55 Uncertainty in time = +/- 9 secs Prediction of 2012 Oct 26.0 Data for the target star ------------------------ * name: TYC 1257-00154-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 57 06.0888 DE: +19 49 06.281 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .032 ) * V mag [mag]: 9.8 * B mag [mag]: 11.3 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2908) Shimoyama approx. diameter [km]: 31 approx. diameter ["]: .027 distance from Earth [AU]: 1.59000 * orbital information: orbit source: Preston date of fit: 2012 Oct 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 757 number of rejected observations: 19 time covered by the observations: 1954 Jul 02 - 2012 Oct 20 1 sigma uncertainty ellipse (major, minor, PA): 0.082, 0.049, 91° remarks: * orbital elements for (2908) Shimoyama : Mean anomaly = 19.34265182 deg Arg. of pericenter = 155.18307447 deg Long. of node = 233.38890898 deg Inclination = 13.37616155 deg Eccentricity = 0.15410497 Semimajor axis = 2.97921671 AU Perihelion dist = 2.52010460 AU Mag: H = 11.70, G = 0.15 Epoch of elements : MJD 56238.06000000 TDT (2012 Nov 07.060) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 7 2908 Shimoyama 1h 26.5m UT 9.8 3 57 6.089 19 49 6.28TYC 1257-00154-1 11.3 15.2 31 2.8 1.590 -1.926 -20.48 -9.0010 19.824 154.31 -16.35 1.4412 -0.08712 0.11497 -4.91207 -3.70269 -0.00164 -0.00028 2000 17.79780320121030.00000155.183074233.388909 13.3761620.15410497 2.9792167 2.520104611.7 5.00.15 RATE 1.9166860 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.085 0.058 91 3.56 0.069 0 0-2 1 056226.0020121107_0154-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 25, 21:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org