IOTA/IOTA-ES occultation update for (2052) Tamriko / TYC 1287-01671-1 event on 2012 Oct 14, 00:25 UT Visible from Russia, SW Asia Summary ------- On 2012 Oct 14 UT, the 28 km diameter asteroid (2052) Tamriko will occult a 11.0 mag star in the constellation Taurus for observers along a path across Russia, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 mag to 15.2 mag (the magnitude of the asteroid) for at most 5.5 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: 23 * date and approx. time of event: 2012 Oct 14, 00:04 - 2012 Oct 14, 00:39 UT * geocentric midpoint of event [JD]: 2456214.51749167 * magnitude of target star: 11.0 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 5.5 * Moon: 3 % sunlit, 101° distance * Sun: 121° distance * rough path description: Russia, SW Asia The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 2.88 * 1 sigma uncertainty interval [seconds]: +/- 13.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .043", 91° ) * approx speed of asteroid's shadow [km/s]: 4.9727 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1287-01671-1 by 2052 Tamriko on 2012 Oct 14 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 Latitude Latitude Latitude Latitude 73 0 0 -18 10 3 0 39 35 46 322 -1 -18 29 2 -17 51 1 -20 16 59 -15 59 54 72 0 0 -15 58 41 0 38 54 48 322 -2 -16 18 24 -15 38 53 -18 10 32 -13 43 15 71 0 0 -13 39 25 0 38 10 51 321 -4 -13 59 56 -13 18 48 -15 56 32 -11 18 21 70 0 0 -11 11 52 0 37 21 54 321 -5 -11 33 14 -10 50 24 -13 34 36 - 8 44 48 69 0 0 - 8 35 42 0 36 28 56 320 -7 - 8 57 59 - 8 13 19 -11 4 21 - 6 2 19 68 0 0 - 5 50 43 0 35 30 59 319 -9 - 6 13 56 - 5 27 24 - 8 25 34 - 3 10 44 67 0 0 - 2 56 54 0 34 28 62 317 -10 - 3 21 5 - 2 32 35 - 5 38 7 - 0 10 9 66 0 0 0 5 33 0 33 21 65 315 -12 - 0 19 36 0 30 50 - 2 42 6 2 59 4 65 0 0 3 16 5 0 32 10 68 311 -14 2 49 59 3 42 19 0 22 6 6 16 8 64 0 0 6 33 42 0 30 55 71 307 -15 6 6 43 7 0 49 3 33 47 9 39 48 63 0 0 9 57 0 0 29 36 74 300 -17 9 29 13 10 24 54 6 51 46 13 8 21 62 0 0 13 24 5 0 28 16 77 289 -19 12 55 40 13 52 37 10 14 28 16 39 35 61 0 0 16 52 42 0 26 53 79 274 -20 16 23 51 17 21 40 13 39 53 20 10 58 60 0 0 20 20 21 0 25 31 80 255 -22 19 51 16 20 49 33 17 5 45 23 39 52 59 0 0 23 44 32 0 24 11 79 234 -23 23 15 26 24 13 43 20 29 37 27 3 43 58 0 0 27 2 56 0 22 53 78 218 -24 26 34 3 27 31 54 23 49 10 30 20 19 57 0 0 30 13 38 0 21 38 76 205 -25 29 45 9 30 42 11 27 2 18 33 27 57 56 0 0 33 15 11 0 20 28 73 197 -26 32 47 16 33 43 10 30 7 23 36 25 26 55 0 0 36 6 41 0 19 22 71 191 -26 35 39 26 36 33 59 33 3 15 39 12 7 54 0 0 38 47 40 0 18 21 68 186 -27 38 21 10 39 14 13 35 49 10 41 47 48 53 0 0 41 18 4 0 17 25 66 183 -27 40 52 22 41 43 48 38 24 51 44 12 37 52 0 0 43 38 6 0 16 34 64 180 -27 43 13 14 44 3 1 40 50 21 46 26 59 51 0 0 45 48 12 0 15 47 61 178 -28 45 24 8 46 12 16 43 5 57 48 31 24 50 0 0 47 48 53 0 15 4 59 175 -28 47 25 38 48 12 9 45 12 4 50 26 33 49 0 0 49 40 47 0 14 25 57 174 -28 49 18 19 50 3 15 47 9 15 52 13 4 48 0 0 51 24 31 0 13 49 56 172 -28 51 2 49 51 46 13 48 58 6 53 51 37 47 0 0 53 0 43 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36 - 26 0 0 77 50 17 0 5 23 19 95 -20 77 42 39 77 57 56 76 58 39 78 42 4 - 27 0 0 77 50 34 0 5 21 19 94 -19 77 42 55 77 58 13 76 58 57 78 42 19 - 28 0 0 77 50 38 0 5 20 18 93 -19 77 42 59 77 58 17 76 59 1 78 42 23 - 29 0 0 77 50 29 0 5 18 18 92 -19 77 42 50 77 58 8 76 58 51 78 42 15 - 30 0 0 77 50 8 0 5 17 18 91 -19 77 42 29 77 57 47 76 58 29 78 41 55 - 31 0 0 77 49 34 0 5 15 18 90 -19 77 41 55 77 57 14 76 57 52 78 41 24 - 32 0 0 77 48 47 0 5 14 17 89 -19 77 41 8 77 56 27 76 57 2 78 40 41 - 33 0 0 77 47 48 0 5 12 17 88 -19 77 40 8 77 55 29 76 55 59 78 39 46 - 34 0 0 77 46 36 0 5 11 17 87 -19 77 38 55 77 54 17 76 54 42 78 38 39 - 35 0 0 77 45 11 0 5 10 17 86 -19 77 37 29 77 52 53 76 53 11 78 37 20 - 36 0 0 77 43 33 0 5 8 17 85 -19 77 35 50 77 51 16 76 51 26 78 35 48 - 37 0 0 77 41 42 0 5 7 16 84 -19 77 33 57 77 49 26 76 49 27 78 34 5 - 38 0 0 77 39 37 0 5 5 16 83 -18 77 31 52 77 47 23 76 47 14 78 32 9 - 39 0 0 77 37 19 0 5 4 16 82 -18 77 29 32 77 45 6 76 44 46 78 30 1 - 40 0 0 77 34 47 0 5 3 16 81 -18 77 26 59 77 42 36 76 42 4 78 27 39 - 41 0 0 77 32 2 0 5 1 16 80 -18 77 24 12 77 39 52 76 39 7 78 25 5 - 42 0 0 77 29 2 0 5 0 15 79 -18 77 21 10 77 36 54 76 35 55 78 22 18 - 43 0 0 77 25 48 0 4 59 15 78 -18 77 17 54 77 33 42 76 32 28 78 19 17 - 44 0 0 77 22 19 0 4 57 15 77 -18 77 14 23 77 30 15 76 28 45 78 16 3 - 45 0 0 77 18 35 0 4 56 15 77 -18 77 10 37 77 26 34 76 24 46 78 12 34 - 46 0 0 77 14 36 0 4 55 14 76 -18 77 6 36 77 22 37 76 20 30 78 8 51 - 47 0 0 77 10 22 0 4 53 14 75 -18 77 2 18 77 18 25 76 15 58 78 4 54 - 48 0 0 77 5 51 0 4 52 14 74 -17 76 57 45 77 13 57 76 11 9 78 0 42 - 49 0 0 77 1 4 0 4 51 14 73 -17 76 52 55 77 9 13 76 6 3 77 56 14 - 50 0 0 76 56 0 0 4 49 13 72 -17 76 47 48 77 4 12 76 0 38 77 51 31 - 51 0 0 76 50 38 0 4 48 13 71 -17 76 42 23 76 58 54 75 54 55 77 46 31 - 52 0 0 76 44 59 0 4 47 13 70 -17 76 36 40 76 53 18 75 48 53 77 41 15 - 53 0 0 76 39 1 0 4 45 13 69 -17 76 30 39 76 47 24 75 42 31 77 35 42 - 54 0 0 76 32 45 0 4 44 12 68 -17 76 24 19 76 41 11 75 35 49 77 29 51 - 55 0 0 76 26 8 0 4 43 12 67 -17 76 17 39 76 34 39 75 28 46 77 23 41 - 56 0 0 76 19 12 0 4 42 12 66 -17 76 10 38 76 27 46 75 21 22 77 17 13 - 57 0 0 76 11 55 0 4 40 12 65 -16 76 3 16 76 20 33 75 13 36 77 10 25 - 58 0 0 76 4 15 0 4 39 11 64 -16 75 55 33 76 12 58 75 5 26 77 3 16 - 59 0 0 75 56 14 0 4 38 11 63 -16 75 47 26 76 5 2 74 56 52 76 55 47 - 60 0 0 75 47 49 0 4 37 11 62 -16 75 38 56 75 56 42 74 47 54 76 47 56 - 61 0 0 75 38 59 0 4 35 11 61 -16 75 30 2 75 47 57 74 38 30 76 39 42 - 62 0 0 75 29 45 0 4 34 10 60 -16 75 20 42 75 38 48 74 28 39 76 31 4 - 63 0 0 75 20 4 0 4 33 10 59 -16 75 10 55 75 29 13 74 18 20 76 22 2 - 64 0 0 75 9 56 0 4 32 10 58 -15 75 0 41 75 19 11 74 7 32 76 12 34 - 65 0 0 74 59 19 0 4 31 9 57 -15 74 49 58 75 8 40 73 56 14 76 2 39 - 66 0 0 74 48 13 0 4 29 9 56 -15 74 38 45 74 57 40 73 44 24 75 52 16 - 67 0 0 74 36 35 0 4 28 9 55 -15 74 27 1 74 46 9 73 32 1 75 41 24 - 68 0 0 74 24 25 0 4 27 8 54 -15 74 14 44 74 34 6 73 19 4 75 30 2 - 69 0 0 74 11 40 0 4 26 8 53 -15 74 1 52 74 21 29 73 5 30 75 18 7 - 70 0 0 73 58 20 0 4 25 8 52 -15 73 48 24 74 8 17 72 51 19 75 5 39 - 71 0 0 73 44 23 0 4 24 7 51 -14 73 34 19 73 54 27 72 36 28 74 52 35 - 72 0 0 73 29 46 0 4 23 7 50 -14 73 19 33 73 39 58 72 20 55 74 38 54 - 73 0 0 73 14 27 0 4 22 6 49 -14 73 4 6 73 24 48 72 4 39 74 24 35 - 74 0 0 72 58 25 0 4 21 6 48 -14 72 47 55 73 8 55 71 47 37 74 9 34 - 75 0 0 72 41 37 0 4 20 6 47 -14 72 30 58 72 52 17 71 29 46 73 53 50 - 76 0 0 72 24 1 0 4 19 5 46 -13 72 13 13 72 34 51 71 11 5 73 37 20 - 77 0 0 72 5 34 0 4 18 5 45 -13 71 54 35 72 16 34 70 51 30 73 20 2 - 78 0 0 71 46 14 0 4 17 4 44 -13 71 35 4 71 57 24 70 30 58 73 1 54 - 79 0 0 71 25 56 0 4 16 4 44 -13 71 14 36 71 37 17 70 9 27 72 42 51 - 80 0 0 71 4 39 0 4 16 3 43 -12 70 53 7 71 16 11 69 46 54 72 22 52 - 81 0 0 70 42 18 0 4 15 3 42 -12 70 30 34 70 54 2 69 23 13 72 1 52 - 82 0 0 70 18 50 0 4 14 2 41 -12 70 6 54 70 30 47 68 58 23 71 39 49 - 83 0 0 69 54 11 0 4 14 2 40 -12 69 42 2 70 6 20 68 32 18 71 16 38 - 84 0 0 69 28 16 0 4 14 1 39 -11 69 15 54 69 40 39 68 4 54 70 52 14 - 85 0 0 69 1 2 0 4 13 1 38 -11 68 48 26 69 13 39 .. .. .. 70 26 35 - 86 0 0 68 32 22 0 4 13 0 37 -11 .. .. .. 68 45 14 .. .. .. 69 59 34 Uncertainty in time = +/- 17 secs Prediction of 2012 Oct 8.0 Data for the target star ------------------------ * name: TYC 1287-01671-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 15 42.0930 DE: +17 15 14.647 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .031 ) * V mag [mag]: 11.0 * B mag [mag]: 12.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2052) Tamriko approx. diameter [km]: 28 approx. diameter ["]: .018 distance from Earth [AU]: 2.09800 * orbital information: orbit source: Preston date of fit: 2012 Oct 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 963 number of rejected observations: 29 time covered by the observations: 1902 Oct 24 - 2012 Oct 03 1 sigma uncertainty ellipse (major, minor, PA): 0.044, 0.030, 92° remarks: * orbital elements for (2052) Tamriko : Mean anomaly = 1.15539712 deg Arg. of pericenter = 206.31324477 deg Long. of node = 213.95621763 deg Inclination = 9.50695096 deg Eccentricity = 0.08591999 Semimajor axis = 3.01020792 AU Perihelion dist = 2.75157088 AU Mag: H = 10.52, G = 0.15 Epoch of elements : MJD 56214.01800000 TDT (2012 Oct 14.018) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 14 2052 Tamriko 0h 25.2m UT 11.0 5 15 42.093 17 15 14.65TYC 1287-01671-1 12.2 15.2 28 5.5 2.098 0.325 -10.80 49.6664 17.257 170.21 -8.22 0.4198 0.16029 0.07016 1.11605 -2.57528 -0.00496 -0.00007 2000 0.39713520121010.00000206.313245213.956218 9.5069510.08591999 3.0102079 2.751570910.5 5.00.15 RATE 1.8871630 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.043 91 3.88 0.053 0 0 0-3 056208.0020121014_1671-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Oct 07, 18:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org