IOTA/IOTA-ES occultation update for (236) Honoria / UCAC2 36972414 event on 2008 Oct 12, 07:05 UT Visible from Venezuela, Colombia, Central America Summary ------- On 2008 Oct 12 UT, the 86 km diameter asteroid (236) Honoria will occult a 11.3 mag star in the constellation Gemini for observers along a path across Venezuela, Colombia, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.3 mag (the magnitude of the asteroid) for at most 7.8 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: 61 * date and approx. time of event: 2008 Oct 12, 06:55 - 2008 Oct 12, 07:07 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 7.8 * Moon: 92 % sunlit, 112° distance * Sun: 101° distance * rough path description: Venezuela, Colombia, Central America The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 1.01 * 1 sigma uncertainty interval [seconds]: +/- 7.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .056", .054", 90° ) * approx speed of asteroid's shadow [km/s]: 11.0578 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 36972414 by 236 Honoria on 2008 Oct 12 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 -118 0 0 9 0 45 6 55 48 1 75 -79 8 35 43 9 25 43 7 45 0 10 16 0 -117 0 0 9 16 3 6 55 48 2 75 -80 8 51 5 9 40 59 8 0 28 10 31 10 -116 0 0 9 30 52 6 55 49 3 76 -81 9 5 56 9 55 45 8 15 25 10 45 51 -115 0 0 9 45 10 6 55 49 4 76 -82 9 20 17 10 10 0 8 29 52 11 0 1 -114 0 0 9 58 59 6 55 50 5 76 -83 9 34 8 10 23 46 8 43 48 11 13 42 -113 0 0 10 12 17 6 55 51 6 76 -84 9 47 29 10 37 1 8 57 14 11 26 52 -112 0 0 10 25 4 6 55 52 7 76 -85 10 0 19 10 49 46 9 10 8 11 39 32 -111 0 0 10 37 21 6 55 54 8 76 -85 10 12 38 11 2 1 9 22 33 11 51 42 -110 0 0 10 49 7 6 55 55 9 77 -86 10 24 26 11 13 45 9 34 26 12 3 21 -109 0 0 11 0 22 6 55 57 10 77 -86 10 35 44 11 24 58 9 45 48 12 14 30 -108 0 0 11 11 7 6 55 59 11 77 -86 10 46 30 11 35 40 9 56 39 12 25 8 -107 0 0 11 21 20 6 56 1 12 77 -86 10 56 46 11 45 52 10 6 58 12 35 15 -106 0 0 11 31 3 6 56 3 13 77 -86 11 6 30 11 55 32 10 16 46 12 44 52 -105 0 0 11 40 14 6 56 5 14 77 -85 11 15 43 12 4 42 10 26 3 12 53 58 -104 0 0 11 48 54 6 56 8 15 78 -85 11 24 25 12 13 20 10 34 49 13 2 33 -103 0 0 11 57 3 6 56 11 16 78 -84 11 32 36 12 21 27 10 43 2 13 10 37 -102 0 0 12 4 40 6 56 14 17 78 -83 11 40 15 12 29 3 10 50 44 13 18 9 -101 0 0 12 11 46 6 56 17 18 78 -82 11 47 22 12 36 8 10 57 55 13 25 11 -100 0 0 12 18 21 6 56 20 19 78 -81 11 53 58 12 42 41 11 4 33 13 31 42 - 99 0 0 12 24 24 6 56 23 20 79 -80 12 0 2 12 48 43 11 10 40 13 37 41 - 98 0 0 12 29 55 6 56 27 21 79 -79 12 5 35 12 54 13 11 16 14 13 43 9 - 97 0 0 12 34 55 6 56 31 22 79 -78 12 10 35 12 59 12 11 21 17 13 48 6 - 96 0 0 12 39 23 6 56 35 23 79 -78 12 15 4 13 3 39 11 25 47 13 52 32 - 95 0 0 12 43 19 6 56 39 24 79 -77 12 19 1 13 7 35 11 29 46 13 56 26 - 94 0 0 12 46 44 6 56 43 25 79 -76 12 22 26 13 10 58 11 33 12 13 59 48 - 93 0 0 12 49 36 6 56 48 26 80 -75 12 25 19 13 13 50 11 36 6 14 2 39 - 92 0 0 12 51 56 6 56 52 27 80 -74 12 27 40 13 16 10 11 38 28 14 4 58 - 91 0 0 12 53 45 6 56 57 28 80 -73 12 29 28 13 17 58 11 40 17 14 6 46 - 90 0 0 12 55 1 6 57 2 29 80 -72 12 30 45 13 19 14 11 41 34 14 8 2 - 89 0 0 12 55 45 6 57 7 30 80 -71 12 31 29 13 19 59 11 42 18 14 8 46 - 88 0 0 12 55 57 6 57 12 31 80 -70 12 31 41 13 20 11 11 42 30 14 8 58 - 87 0 0 12 55 37 6 57 17 32 80 -69 12 31 20 13 19 50 11 42 9 14 8 38 - 86 0 0 12 54 44 6 57 23 33 81 -68 12 30 27 13 18 58 11 41 15 14 7 46 - 85 0 0 12 53 19 6 57 29 34 81 -67 12 29 2 13 17 33 11 39 48 14 6 23 - 84 0 0 12 51 22 6 57 35 34 81 -66 12 27 4 13 15 36 11 37 49 14 4 27 - 83 0 0 12 48 51 6 57 41 35 81 -65 12 24 33 13 13 7 11 35 17 14 1 59 - 82 0 0 12 45 49 6 57 47 36 81 -64 12 21 29 13 10 5 11 32 12 13 58 58 - 81 0 0 12 42 13 6 57 53 37 81 -63 12 17 53 13 6 31 11 28 34 13 55 26 - 80 0 0 12 38 5 6 57 59 38 81 -62 12 13 44 13 2 24 11 24 22 13 51 21 - 79 0 0 12 33 24 6 58 6 39 81 -61 12 9 2 12 57 44 11 19 38 13 46 43 - 78 0 0 12 28 11 6 58 13 40 81 -60 12 3 47 12 52 32 11 14 20 13 41 34 - 77 0 0 12 22 24 6 58 20 41 81 -59 11 57 59 12 46 46 11 8 29 13 35 51 - 76 0 0 12 16 4 6 58 27 42 81 -58 11 51 37 12 40 28 11 2 5 13 29 36 - 75 0 0 12 9 12 6 58 34 43 81 -57 11 44 43 12 33 37 10 55 7 13 22 48 - 74 0 0 12 1 46 6 58 41 44 81 -56 11 37 15 12 26 13 10 47 35 13 15 28 - 73 0 0 11 53 47 6 58 49 45 81 -55 11 29 14 12 18 16 10 39 31 13 7 34 - 72 0 0 11 45 14 6 58 57 46 81 -54 11 20 40 12 9 46 10 30 52 12 59 8 - 71 0 0 11 36 9 6 59 4 47 81 -53 11 11 32 12 0 42 10 21 40 12 50 9 - 70 0 0 11 26 30 6 59 12 48 81 -52 11 1 51 11 51 6 10 11 54 12 40 37 - 69 0 0 11 16 18 6 59 20 49 80 -51 10 51 37 11 40 56 10 1 35 12 30 32 - 68 0 0 11 5 32 6 59 29 50 80 -50 10 40 48 11 30 12 9 50 41 12 19 54 - 67 0 0 10 54 13 6 59 37 51 80 -49 10 29 26 11 18 56 9 39 14 12 8 42 - 66 0 0 10 42 20 6 59 45 52 80 -48 10 17 31 11 7 6 9 27 13 11 56 58 - 65 0 0 10 29 54 6 59 54 53 79 -47 10 5 2 10 54 42 9 14 38 11 44 40 - 64 0 0 10 16 54 7 0 3 54 79 -46 9 51 59 10 41 45 9 1 29 11 31 49 - 63 0 0 10 3 20 7 0 12 55 79 -45 9 38 23 10 28 15 8 47 47 11 18 24 - 62 0 0 9 49 13 7 0 21 56 78 -44 9 24 12 10 14 11 8 33 30 11 4 27 - 61 0 0 9 34 33 7 0 30 57 78 -43 9 9 29 9 59 34 8 18 39 10 49 56 - 60 0 0 9 19 19 7 0 39 58 77 -42 8 54 11 9 44 23 8 3 15 10 34 52 - 59 0 0 9 3 31 7 0 49 59 76 -41 8 38 20 9 28 39 7 47 17 10 19 14 - 58 0 0 8 47 9 7 0 58 60 76 -40 8 21 55 9 12 21 7 30 44 10 3 4 - 57 0 0 8 30 15 7 1 8 61 75 -39 8 4 56 8 55 30 7 13 39 9 46 20 - 56 0 0 8 12 46 7 1 18 61 74 -38 7 47 24 8 38 5 6 55 59 9 29 3 - 55 0 0 7 54 45 7 1 28 62 73 -37 7 29 19 8 20 7 6 37 46 9 11 12 - 54 0 0 7 36 10 7 1 38 63 72 -36 7 10 40 8 1 36 6 18 59 8 52 49 - 53 0 0 7 17 2 7 1 48 64 71 -35 6 51 28 7 42 32 5 59 39 8 33 53 - 52 0 0 6 57 21 7 1 58 65 70 -34 6 31 43 7 22 55 5 39 46 8 14 24 - 51 0 0 6 37 7 7 2 8 66 68 -33 6 11 25 7 2 45 5 19 19 7 54 23 - 50 0 0 6 16 20 7 2 19 67 67 -31 5 50 34 6 42 3 4 58 20 7 33 48 - 49 0 0 5 55 1 7 2 29 68 65 -30 5 29 11 6 20 48 4 36 47 7 12 42 - 48 0 0 5 33 10 7 2 40 68 63 -29 5 7 15 5 59 1 4 14 43 6 51 3 - 47 0 0 5 10 46 7 2 51 69 61 -28 4 44 47 5 36 41 3 52 6 6 28 52 - 46 0 0 4 47 50 7 3 2 70 59 -27 4 21 47 5 13 50 3 28 57 6 6 10 - 45 0 0 4 24 23 7 3 13 70 57 -26 3 58 15 4 50 27 3 5 16 5 42 56 - 44 0 0 4 0 25 7 3 24 71 54 -25 3 34 12 4 26 33 2 41 4 5 19 11 - 43 0 0 3 35 55 7 3 35 72 52 -24 3 9 38 4 2 8 2 16 21 4 54 55 - 42 0 0 3 10 55 7 3 46 72 49 -23 2 44 34 3 37 13 1 51 7 4 30 8 - 41 0 0 2 45 25 7 3 57 73 45 -22 2 18 59 3 11 47 1 25 23 4 4 51 - 40 0 0 2 19 25 7 4 9 73 42 -21 1 52 54 2 45 51 0 59 9 3 39 5 - 39 0 0 1 52 55 7 4 20 73 39 -20 1 26 20 2 19 26 0 32 26 3 12 49 - 38 0 0 1 25 57 7 4 31 74 35 -19 0 59 18 1 52 33 0 5 14 2 46 4 - 37 0 0 0 58 30 7 4 43 74 31 -17 0 31 46 1 25 10 - 0 22 26 2 18 51 - 36 0 0 0 30 36 7 4 54 74 27 -16 0 3 48 0 57 21 - 0 50 34 1 51 10 - 35 0 0 0 2 14 7 5 6 74 23 -15 - 0 24 38 0 29 3 - 1 19 9 1 23 2 - 34 0 0 - 0 26 34 7 5 18 74 19 -14 - 0 53 31 0 0 20 - 1 48 11 0 54 27 - 33 0 0 - 0 55 48 7 5 29 74 15 -13 - 1 22 50 - 0 28 50 - 2 17 38 0 25 26 - 32 0 0 - 1 25 27 7 5 41 74 11 -12 - 1 52 33 - 0 58 25 - 2 47 31 - 0 4 1 - 31 0 0 - 1 55 31 7 5 53 73 7 -11 - 2 22 41 - 1 28 25 - 3 17 47 - 0 33 52 - 30 0 0 - 2 25 59 7 6 4 73 4 -10 - 2 53 13 - 1 58 48 - 3 48 28 - 1 4 7 - 29 0 0 - 2 56 49 7 6 16 72 0 -9 - 3 24 8 - 2 29 35 - 4 19 31 - 1 34 45 - 28 0 0 - 3 28 2 7 6 27 72 357 -7 - 3 55 25 - 3 0 44 - 4 50 56 - 2 5 46 - 27 0 0 - 3 59 36 7 6 39 71 354 -6 - 4 27 2 - 3 32 14 - 5 22 42 - 2 37 8 - 26 0 0 - 4 31 30 7 6 51 71 351 -5 - 4 59 1 - 4 4 4 - 5 54 47 - 3 8 51 - 25 0 0 - 5 3 44 7 7 2 70 348 -4 - 5 31 18 - 4 36 14 - 6 27 12 - 3 40 54 - 24 0 0 - 5 36 16 7 7 14 69 346 -3 - 6 3 54 - 5 8 43 - 6 59 56 - 4 13 15 - 23 0 0 - 6 9 6 7 7 25 68 344 -2 - 6 36 47 - 5 41 29 - 7 32 56 - 4 45 55 - 22 0 0 - 6 42 12 7 7 37 67 341 -1 - 7 9 56 - 6 14 32 - 8 6 12 - 5 18 51 Uncertainty in time = +/- 8 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: UCAC2 36972414 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 35 01.6285 DE: +14 43 12.272 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .053, .053 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (236) Honoria approx. diameter [km]: 86 approx. diameter ["]: .054 distance from Earth [AU]: 2.20800 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 749 number of rejected observations: 131 time covered by the observations: 1903 May 05 - 2008 Sep 24 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.011, 92° remarks: * orbital elements for (236) Honoria : Mean anomaly = 55.75754433 deg Arg. of pericenter = 174.44084631 deg Long. of node = 186.07490780 deg Inclination = 7.68053845 deg Eccentricity = 0.18700254 Semimajor axis = 2.80087756 AU Perihelion dist = 2.27710635 AU Mag: H = 7.93, G = -0.02 Epoch of elements : MJD 54751.29500000 TDT (2008 Oct 12.295) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 12 236 Honoria 7h 5.0m UT 11.3 6 35 1.628 14 43 12.27UCAC2 36972414 0.0 13.3 86 7.8 2.208 1.551 -10.53 -28.7377 14.723 70.35 -7.57 7.0841 -0.11621 -0.24942 5.65342 -2.64445 -0.00555 0.00050 2000 55.48525320081011.00000174.440846186.074908 7.6805380.18700254 2.8008776 2.2771063 8.2 5.0-.02 RATE 2.1026310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.056 0.054 90 2.01 0.054 0 54740.5020081012_972414 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org