IOTA/IOTA-ES occultation update for (1123) Shapleya / TYC 1342-01397-1 event on 2008 Oct 18, 10:10 UT Visible from Peru, Ecuador Summary ------- On 2008 Oct 18 UT, the 15 km diameter asteroid (1123) Shapleya will occult a 10.0 mag star in the constellation Gemini for observers along a path across Peru, Ecuador. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 15.2 mag (the magnitude of the asteroid) for at most 1.4 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: 37 * date and approx. time of event: 2008 Oct 18, 10:01 - 2008 Oct 18, 10:11 UT * midpoint of event [JD]: 2454757.9240625 * magnitude of target star: 10.0 * magnitude drop [mag]: 5.2 * estimated maximum duration [s]: 1.4 * Moon: 82 % sunlit, 26° distance * Sun: 104° distance * rough path description: Peru, Ecuador The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 1.79 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .042", .027", 87° ) * approx speed of asteroid's shadow [km/s]: 11.0852 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1342-01397-1 by 1123 Shapleya on 2008 Oct 18 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 -153 0 0 -29 12 16 10 1 59 0 65 -51 -29 17 11 -29 7 20 .. .. .. .. .. .. -152 0 0 -28 47 43 10 1 59 1 65 -51 -28 52 39 -28 42 47 -29 10 19 .. .. .. -151 0 0 -28 23 2 10 1 59 2 64 -52 -28 27 57 -28 18 6 -28 45 38 -28 0 30 -150 0 0 -27 58 12 10 1 59 3 64 -52 -28 3 8 -27 53 17 -28 20 49 -27 35 40 -149 0 0 -27 33 16 10 2 0 4 63 -52 -27 38 12 -27 28 20 -27 55 53 -27 10 43 -148 0 0 -27 8 13 10 2 1 5 63 -53 -27 13 8 -27 3 17 -27 30 50 -26 45 40 -147 0 0 -26 43 3 10 2 2 6 62 -53 -26 47 59 -26 38 7 -27 5 40 -26 20 30 -146 0 0 -26 17 48 10 2 3 7 62 -53 -26 22 44 -26 12 52 -26 40 25 -25 55 15 -145 0 0 -25 52 28 10 2 5 8 61 -53 -25 57 24 -25 47 32 -26 15 5 -25 29 55 -144 0 0 -25 27 4 10 2 6 9 61 -53 -25 31 59 -25 22 8 -25 49 40 -25 4 31 -143 0 0 -25 1 36 10 2 8 10 60 -54 -25 6 31 -24 56 40 -25 24 12 -24 39 3 -142 0 0 -24 36 4 10 2 10 11 60 -54 -24 41 0 -24 31 9 -24 58 41 -24 13 33 -141 0 0 -24 10 31 10 2 12 12 60 -54 -24 15 27 -24 5 36 -24 33 7 -23 48 0 -140 0 0 -23 44 56 10 2 15 13 59 -54 -23 49 52 -23 40 1 -24 7 31 -23 22 25 -139 0 0 -23 19 20 10 2 17 14 59 -54 -23 24 15 -23 14 25 -23 41 55 -22 56 50 -138 0 0 -22 53 44 10 2 20 15 58 -54 -22 58 39 -22 48 49 -23 16 18 -22 31 14 -137 0 0 -22 28 8 10 2 23 16 58 -54 -22 33 3 -22 23 13 -22 50 41 -22 5 39 -136 0 0 -22 2 33 10 2 27 17 57 -53 -22 7 28 -21 57 38 -22 25 5 -21 40 5 -135 0 0 -21 37 0 10 2 30 18 57 -53 -21 41 55 -21 32 5 -21 59 31 -21 14 33 -134 0 0 -21 11 29 10 2 34 19 57 -53 -21 16 24 -21 6 35 -21 34 0 -20 49 3 -133 0 0 -20 46 2 10 2 38 20 56 -53 -20 50 56 -20 41 8 -21 8 32 -20 23 37 -132 0 0 -20 20 39 10 2 42 21 56 -53 -20 25 33 -20 15 45 -20 43 7 -19 58 15 -131 0 0 -19 55 20 10 2 46 22 55 -52 -20 0 14 -19 50 27 -20 17 47 -19 32 57 -130 0 0 -19 30 7 10 2 50 23 55 -52 -19 35 0 -19 25 14 -19 52 33 -19 7 45 -129 0 0 -19 5 0 10 2 55 24 54 -52 -19 9 53 -19 0 7 -19 27 24 -18 42 39 -128 0 0 -18 39 59 10 3 0 25 54 -51 -18 44 52 -18 35 6 -19 2 22 -18 17 40 -127 0 0 -18 15 6 10 3 5 26 54 -51 -18 19 59 -18 10 14 -18 37 28 -17 52 49 -126 0 0 -17 50 21 10 3 10 27 53 -51 -17 55 14 -17 45 30 -18 12 41 -17 28 6 -125 0 0 -17 25 46 10 3 16 28 53 -50 -17 30 38 -17 20 54 -17 48 4 -17 3 32 -124 0 0 -17 1 19 10 3 21 29 52 -50 -17 6 11 -16 56 28 -17 23 36 -16 39 7 -123 0 0 -16 37 4 10 3 27 30 52 -49 -16 41 55 -16 32 13 -16 59 18 -16 14 53 -122 0 0 -16 12 59 10 3 33 31 51 -49 -16 17 49 -16 8 8 -16 35 12 -15 50 50 -121 0 0 -15 49 5 10 3 39 32 51 -48 -15 53 56 -15 44 15 -16 11 17 -15 26 58 -120 0 0 -15 25 24 10 3 46 33 50 -47 -15 30 14 -15 20 35 -15 47 34 -15 3 19 -119 0 0 -15 1 56 10 3 52 34 50 -47 -15 6 46 -14 57 7 -15 24 4 -14 39 53 -118 0 0 -14 38 42 10 3 59 35 49 -46 -14 43 31 -14 33 53 -15 0 47 -14 16 41 -117 0 0 -14 15 42 10 4 6 36 49 -46 -14 20 30 -14 10 53 -14 37 45 -13 53 42 -116 0 0 -13 52 57 10 4 13 37 48 -45 -13 57 45 -13 48 9 -14 14 58 -13 30 59 -115 0 0 -13 30 27 10 4 21 38 48 -44 -13 35 14 -13 25 39 -13 52 26 -13 8 31 -114 0 0 -13 8 13 10 4 28 39 47 -43 -13 13 0 -13 3 26 -13 30 10 -12 46 20 -113 0 0 -12 46 16 10 4 36 40 47 -43 -12 51 3 -12 41 29 -13 8 11 -12 24 25 -112 0 0 -12 24 36 10 4 43 41 46 -42 -12 29 23 -12 19 50 -12 46 29 -12 2 47 -111 0 0 -12 3 14 10 4 51 42 45 -41 -12 8 0 -11 58 29 -12 25 5 -11 41 27 -110 0 0 -11 42 11 10 4 59 43 45 -40 -11 46 56 -11 37 25 -12 3 59 -11 20 26 -109 0 0 -11 21 26 10 5 8 44 44 -40 -11 26 11 -11 16 41 -11 43 12 -10 59 43 -108 0 0 -11 1 0 10 5 16 45 43 -39 -11 5 45 -10 56 16 -11 22 45 -10 39 20 -107 0 0 -10 40 55 10 5 25 46 43 -38 -10 45 39 -10 36 11 -11 2 37 -10 19 17 -106 0 0 -10 21 10 10 5 33 47 42 -37 -10 25 53 -10 16 27 -10 42 50 - 9 59 34 -105 0 0 -10 1 46 10 5 42 48 41 -36 -10 6 29 - 9 57 3 -10 23 23 - 9 40 12 -104 0 0 - 9 42 43 10 5 51 49 40 -35 - 9 47 25 - 9 38 0 -10 4 18 - 9 21 11 -103 0 0 - 9 24 1 10 6 0 50 39 -35 - 9 28 43 - 9 19 20 - 9 45 35 - 9 2 32 -102 0 0 - 9 5 42 10 6 9 51 39 -34 - 9 10 24 - 9 1 1 - 9 27 13 - 8 44 15 -101 0 0 - 8 47 46 10 6 18 52 38 -33 - 8 52 27 - 8 43 5 - 9 9 15 - 8 26 21 -100 0 0 - 8 30 13 10 6 27 52 37 -32 - 8 34 53 - 8 25 32 - 8 51 39 - 8 8 50 - 99 0 0 - 8 13 2 10 6 37 53 36 -31 - 8 17 43 - 8 8 23 - 8 34 27 - 7 51 42 - 98 0 0 - 7 56 16 10 6 46 54 35 -30 - 8 0 56 - 7 51 37 - 8 17 39 - 7 34 58 - 97 0 0 - 7 39 54 10 6 56 55 33 -29 - 7 44 33 - 7 35 15 - 8 1 14 - 7 18 37 - 96 0 0 - 7 23 56 10 7 6 56 32 -28 - 7 28 35 - 7 19 17 - 7 45 14 - 7 2 42 - 95 0 0 - 7 8 23 10 7 16 56 31 -27 - 7 13 1 - 7 3 45 - 7 29 39 - 6 47 11 - 94 0 0 - 6 53 15 10 7 25 57 30 -26 - 6 57 53 - 6 48 37 - 7 14 29 - 6 32 4 - 93 0 0 - 6 38 32 10 7 35 58 28 -25 - 6 43 10 - 6 33 55 - 6 59 44 - 6 17 24 - 92 0 0 - 6 24 15 10 7 45 59 27 -25 - 6 28 52 - 6 19 38 - 6 45 25 - 6 3 9 - 91 0 0 - 6 10 24 10 7 56 59 25 -24 - 6 15 1 - 6 5 47 - 6 31 32 - 5 49 19 - 90 0 0 - 5 56 59 10 8 6 60 24 -23 - 6 1 35 - 5 52 23 - 6 18 5 - 5 35 56 - 89 0 0 - 5 44 0 10 8 16 60 22 -22 - 5 48 36 - 5 39 25 - 6 5 5 - 5 22 59 - 88 0 0 - 5 31 28 10 8 26 61 21 -21 - 5 36 4 - 5 26 53 - 5 52 31 - 5 10 29 - 87 0 0 - 5 19 23 10 8 36 62 19 -20 - 5 23 58 - 5 14 48 - 5 40 24 - 4 58 25 - 86 0 0 - 5 7 45 10 8 47 62 17 -19 - 5 12 19 - 5 3 10 - 5 28 44 - 4 46 49 - 85 0 0 - 4 56 34 10 8 57 63 15 -18 - 5 1 8 - 4 51 59 - 5 17 31 - 4 35 39 - 84 0 0 - 4 45 50 10 9 8 63 13 -17 - 4 50 24 - 4 41 16 - 5 6 46 - 4 24 57 - 83 0 0 - 4 35 34 10 9 18 63 11 -16 - 4 40 7 - 4 31 0 - 4 56 29 - 4 14 42 - 82 0 0 - 4 25 45 10 9 28 64 9 -15 - 4 30 19 - 4 21 12 - 4 46 39 - 4 4 56 - 81 0 0 - 4 16 25 10 9 39 64 7 -14 - 4 20 58 - 4 11 52 - 4 37 17 - 3 55 36 - 80 0 0 - 4 7 32 10 9 49 64 5 -13 - 4 12 5 - 4 3 0 - 4 28 23 - 3 46 45 - 79 0 0 - 3 59 8 10 10 0 64 2 -12 - 4 3 40 - 3 54 36 - 4 19 57 - 3 38 22 - 78 0 0 - 3 51 12 10 10 10 65 0 -11 - 3 55 44 - 3 46 40 - 4 12 0 - 3 30 27 - 77 0 0 - 3 43 44 10 10 21 65 358 -10 - 3 48 16 - 3 39 12 - 4 4 31 - 3 23 0 - 76 0 0 - 3 36 44 10 10 31 65 356 -9 - 3 41 16 - 3 32 13 - 3 57 31 - 3 16 2 - 75 0 0 - 3 30 14 10 10 42 65 353 -8 - 3 34 45 - 3 25 42 - 3 50 59 - 3 9 32 - 74 0 0 - 3 24 11 10 10 53 65 351 -7 - 3 28 43 - 3 19 40 - 3 44 55 - 3 3 31 - 73 0 0 - 3 18 38 10 11 3 65 349 -6 - 3 23 9 - 3 14 7 - 3 39 21 - 2 57 58 - 72 0 0 - 3 13 33 10 11 13 64 347 -5 - 3 18 4 - 3 9 2 - 3 34 15 - 2 52 54 - 71 0 0 - 3 8 57 10 11 24 64 344 -4 - 3 13 28 - 3 4 26 - 3 29 39 - 2 48 19 - 70 0 0 - 3 4 50 10 11 34 64 342 -3 - 3 9 20 - 3 0 19 - 3 25 31 - 2 44 12 - 69 0 0 - 3 1 11 10 11 45 64 340 -2 - 3 5 42 - 2 56 41 - 3 21 52 - 2 40 35 - 68 0 0 - 2 58 2 10 11 55 63 338 -1 - 3 2 32 - 2 53 32 - 3 18 42 - 2 37 26 Uncertainty in time = +/- 4 secs [Prediction of 2008 Aug 6.0] Data for the target star ------------------------ * name: TYC 1342-01397-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 47 10.5018 DE: +21 35 34.512 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .022 ) * V mag [mag]: 10.0 * B mag [mag]: 11.0 * Apparent position with proper motion RA(deg): 101.9303861105 DE(deg): 21.5844553389 * Equation of equinoxes (radians) : 0.000047572152185 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1123) Shapleya approx. diameter [km]: 15 approx. diameter ["]: .015 distance from Earth [AU]: 1.41400 * orbital information: orbit source: Preston date of fit: 2008 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 722 number of rejected observations: 38 time covered by the observations: 1928 Sep 21 - 2007 Nov 06 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.016, 86° remarks: * orbital elements for (1123) Shapleya : Mean anomaly = 24.40133041 deg Arg. of pericenter = 317.40629934 deg Long. of node = 79.98339035 deg Inclination = 6.41898063 deg Eccentricity = 0.15615235 Semimajor axis = 2.22518400 AU Perihelion dist = 1.87771630 AU Mag: H = 11.52, G = 0.15 Epoch of elements : MJD 54757.42400000 TDT (2008 Oct 18.424) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 18 1123 Shapleya 10h 10.6m UT 10.0 6 47 10.502 21 35 34.51TYC 1342-01397-1 11.0 15.2 15 1.4 1.414 2.772 4.25 -78.1417 21.591 23.61 -9.83 10.1775 0.04735 -0.42370 6.21942 0.68288 -0.00503 0.00044 2000 22.19691620081011.00000317.406299 79.983390 6.4189810.15615235 2.2251840 1.877716311.7 5.00.15 RATE 2.9693080 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.042 0.027 87 2.79 0.026 0 54684.5020081018_1397-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 12, 18:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org