IOTA/IOTA-ES occultation update for (667) Denise / TYC 1405-01156-1 event on 2008 May 03, 18:10 UT Visible from Africa Summary ------- On 2008 May 03 UT, the 81 km diameter asteroid (667) Denise will occult a 10.7 mag star in the constellation Leo for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 14.2 mag (the magnitude of the asteroid) for at most 5.2 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: 82 * date and approx. time of event: 2008 May 03, 18:09 - 2008 May 03, 18:17 UT * magnitude of target star: 10.7 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 5.2 * Moon: 5 % sunlit, 118° distance * Sun: 94° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.64 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .028", 84° ) * approx speed of asteroid's shadow [km/s]: 15.5111 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1405-01156-1 by 667 Denise on 2008 May 3 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 0 0 0 9 17 6 18 9 54 79 36 -1 8 54 33 9 39 37 8 25 40 10 8 25 1 0 0 9 27 40 18 10 1 79 32 -1 9 5 8 9 50 10 8 36 17 10 18 56 2 0 0 9 37 53 18 10 8 80 28 -2 9 15 23 10 0 21 8 46 33 10 29 6 3 0 0 9 47 45 18 10 16 81 23 -3 9 25 16 10 10 12 8 56 28 10 38 55 4 0 0 9 57 16 18 10 23 81 18 -4 9 34 48 10 19 42 9 6 2 10 48 24 5 0 0 10 6 26 18 10 30 82 12 -5 9 43 59 10 28 51 9 15 14 10 57 31 6 0 0 10 15 14 18 10 38 82 5 -6 9 52 49 10 37 38 9 24 5 11 6 16 7 0 0 10 23 41 18 10 45 82 358 -7 10 1 17 10 46 4 9 32 35 11 14 41 8 0 0 10 31 46 18 10 52 82 351 -8 10 9 23 10 54 8 9 40 42 11 22 43 9 0 0 10 39 30 18 11 0 82 344 -9 10 17 8 11 1 50 9 48 28 11 30 25 10 0 0 10 46 52 18 11 7 82 337 -10 10 24 31 11 9 11 9 55 53 11 37 44 11 0 0 10 53 52 18 11 14 81 331 -11 10 31 32 11 16 11 10 2 55 11 44 42 12 0 0 11 0 30 18 11 22 81 325 -12 10 38 11 11 22 48 10 9 35 11 51 19 13 0 0 11 6 46 18 11 29 80 320 -13 10 44 28 11 29 3 10 15 53 11 57 33 14 0 0 11 12 41 18 11 36 80 315 -14 10 50 23 11 34 57 10 21 50 12 3 25 15 0 0 11 18 13 18 11 43 79 311 -14 10 55 56 11 40 28 10 27 24 12 8 56 16 0 0 11 23 23 18 11 51 78 308 -15 11 1 7 11 45 38 10 32 35 12 14 4 17 0 0 11 28 11 18 11 58 78 305 -16 11 5 56 11 50 25 10 37 25 12 18 51 18 0 0 11 32 37 18 12 5 77 303 -17 11 10 22 11 54 50 10 41 52 12 23 15 19 0 0 11 36 41 18 12 12 76 300 -18 11 14 27 11 58 53 10 45 57 12 27 18 20 0 0 11 40 22 18 12 19 75 298 -19 11 18 8 12 2 34 10 49 40 12 30 58 21 0 0 11 43 41 18 12 26 74 297 -20 11 21 28 12 5 53 10 53 0 12 34 16 22 0 0 11 46 38 18 12 33 73 295 -21 11 24 25 12 8 49 10 55 58 12 37 12 23 0 0 11 49 12 18 12 40 73 294 -22 11 27 0 12 11 23 10 58 33 12 39 45 24 0 0 11 51 24 18 12 47 72 293 -23 11 29 13 12 13 35 11 0 46 12 41 57 25 0 0 11 53 14 18 12 54 71 292 -24 11 31 3 12 15 25 11 2 36 12 43 46 26 0 0 11 54 42 18 13 1 70 291 -25 11 32 30 12 16 52 11 4 4 12 45 13 27 0 0 11 55 47 18 13 8 69 290 -25 11 33 36 12 17 57 11 5 10 12 46 18 28 0 0 11 56 30 18 13 14 68 289 -26 11 34 19 12 18 40 11 5 53 12 47 0 29 0 0 11 56 50 18 13 21 67 289 -27 11 34 39 12 19 0 11 6 14 12 47 20 30 0 0 11 56 48 18 13 28 66 288 -28 11 34 37 12 18 58 11 6 12 12 47 19 31 0 0 11 56 24 18 13 34 65 288 -29 11 34 13 12 18 34 11 5 47 12 46 54 32 0 0 11 55 38 18 13 41 64 287 -30 11 33 26 12 17 48 11 5 1 12 46 8 33 0 0 11 54 29 18 13 48 63 287 -31 11 32 18 12 16 39 11 3 52 12 45 0 34 0 0 11 52 58 18 13 54 62 287 -32 11 30 46 12 15 8 11 2 20 12 43 29 35 0 0 11 51 5 18 14 0 61 287 -33 11 28 53 12 13 15 11 0 26 12 41 37 36 0 0 11 48 49 18 14 7 60 286 -34 11 26 37 12 11 0 10 58 10 12 39 22 37 0 0 11 46 12 18 14 13 59 286 -34 11 23 59 12 8 23 10 55 32 12 36 45 38 0 0 11 43 12 18 14 19 58 286 -35 11 20 59 12 5 24 10 52 32 12 33 47 39 0 0 11 39 51 18 14 26 57 286 -36 11 17 37 12 2 3 10 49 9 12 30 26 40 0 0 11 36 7 18 14 32 56 286 -37 11 13 53 11 58 19 10 45 24 12 26 43 41 0 0 11 32 1 18 14 38 55 286 -38 11 9 47 11 54 14 10 41 17 12 22 39 42 0 0 11 27 34 18 14 44 54 286 -39 11 5 19 11 49 47 10 36 48 12 18 13 43 0 0 11 22 44 18 14 49 53 285 -40 11 0 29 11 44 59 10 31 57 12 13 25 44 0 0 11 17 33 18 14 55 52 285 -41 10 55 17 11 39 48 10 26 45 12 8 15 45 0 0 11 12 0 18 15 1 51 285 -42 10 49 43 11 34 16 10 21 10 12 2 44 46 0 0 11 6 6 18 15 7 50 285 -43 10 43 48 11 28 22 10 15 14 11 56 51 47 0 0 10 59 50 18 15 12 49 285 -43 10 37 31 11 22 7 10 8 56 11 50 37 48 0 0 10 53 12 18 15 18 48 285 -44 10 30 53 11 15 30 10 2 16 11 44 1 49 0 0 10 46 13 18 15 23 47 285 -45 10 23 53 11 8 32 9 55 15 11 37 5 50 0 0 10 38 53 18 15 29 46 285 -46 10 16 31 11 1 13 9 47 53 11 29 47 51 0 0 10 31 11 18 15 34 45 285 -47 10 8 49 10 53 32 9 40 9 11 22 7 52 0 0 10 23 9 18 15 39 44 285 -48 10 0 46 10 45 31 9 32 4 11 14 7 53 0 0 10 14 45 18 15 44 43 286 -49 9 52 21 10 37 9 9 23 38 11 5 46 54 0 0 10 6 1 18 15 49 42 286 -50 9 43 36 10 28 25 9 14 51 10 57 4 55 0 0 9 56 56 18 15 54 41 286 -50 9 34 29 10 19 21 9 5 44 10 48 2 56 0 0 9 47 30 18 15 59 40 286 -51 9 25 2 10 9 57 8 56 15 10 38 39 57 0 0 9 37 44 18 16 4 39 286 -52 9 15 15 10 0 12 8 46 26 10 28 55 58 0 0 9 27 38 18 16 8 38 286 -53 9 5 7 9 50 6 8 36 17 10 18 52 59 0 0 9 17 11 18 16 13 37 286 -54 8 54 39 9 39 41 8 25 48 10 8 28 60 0 0 9 6 24 18 16 17 36 286 -55 8 43 51 9 28 56 8 14 58 9 57 44 61 0 0 8 55 17 18 16 22 35 286 -56 8 32 43 9 17 50 8 3 48 9 46 40 62 0 0 8 43 51 18 16 26 34 286 -56 8 21 16 9 6 25 7 52 19 9 35 17 63 0 0 8 32 5 18 16 30 33 286 -57 8 9 28 8 54 41 7 40 30 9 23 34 64 0 0 8 20 0 18 16 34 32 286 -58 7 57 22 8 42 37 7 28 21 9 11 32 65 0 0 8 7 35 18 16 38 31 286 -59 7 44 56 8 30 14 7 15 54 8 59 11 66 0 0 7 54 52 18 16 42 30 287 -60 7 32 11 8 17 32 7 3 7 8 46 30 67 0 0 7 41 50 18 16 45 29 287 -60 7 19 8 8 4 31 6 50 2 8 33 32 68 0 0 7 28 29 18 16 49 28 287 -61 7 5 45 7 51 12 6 36 38 8 20 14 69 0 0 7 14 50 18 16 52 27 287 -62 6 52 5 7 37 34 6 22 55 8 6 38 70 0 0 7 0 53 18 16 56 26 287 -63 6 38 6 7 23 38 6 8 55 7 52 44 71 0 0 6 46 38 18 16 59 25 287 -63 6 23 50 7 9 25 5 54 36 7 38 33 72 0 0 6 32 5 18 17 2 24 287 -64 6 9 16 6 54 54 5 40 0 7 24 3 73 0 0 6 17 15 18 17 5 23 287 -65 5 54 24 6 40 5 5 25 7 7 9 17 74 0 0 6 2 8 18 17 8 22 287 -66 5 39 15 6 24 59 5 9 56 6 54 13 75 0 0 5 46 44 18 17 11 21 287 -66 5 23 50 6 9 37 4 54 29 6 38 52 76 0 0 5 31 3 18 17 13 20 287 -67 5 8 8 5 53 58 4 38 45 6 23 15 77 0 0 5 15 6 18 17 16 19 288 -67 4 52 9 5 38 2 4 22 45 6 7 21 78 0 0 4 58 53 18 17 18 18 288 -68 4 35 55 5 21 51 4 6 29 5 51 12 79 0 0 4 42 25 18 17 20 17 288 -69 4 19 25 5 5 24 3 49 57 5 34 47 80 0 0 4 25 41 18 17 22 16 288 -69 4 2 40 4 48 41 3 33 9 5 18 6 81 0 0 4 8 42 18 17 24 15 288 -70 3 45 39 4 31 44 3 16 7 5 1 10 82 0 0 3 51 28 18 17 26 14 288 -70 3 28 24 4 14 31 2 58 50 4 44 0 83 0 0 3 34 0 18 17 28 13 288 -70 3 10 54 3 57 5 2 41 19 4 26 35 84 0 0 3 16 18 18 17 29 11 288 -71 2 53 11 3 39 24 2 23 33 4 8 56 85 0 0 2 58 22 18 17 31 10 288 -71 2 35 14 3 21 29 2 5 34 3 51 3 86 0 0 2 40 13 18 17 32 9 288 -71 2 17 3 3 3 22 1 47 22 3 32 57 87 0 0 2 21 51 18 17 33 8 288 -72 1 58 40 2 45 1 1 28 57 3 14 38 88 0 0 2 3 16 18 17 34 7 288 -72 1 40 4 2 26 27 1 10 19 2 56 6 89 0 0 1 44 29 18 17 35 6 288 -72 1 21 16 2 7 42 0 51 30 2 37 22 90 0 0 1 25 31 18 17 36 5 288 -72 1 2 16 1 48 44 0 32 28 2 18 27 91 0 0 1 6 21 18 17 37 4 288 -72 0 43 4 1 29 36 0 13 15 1 59 19 92 0 0 0 47 0 18 17 37 3 288 -72 0 23 42 1 10 16 - 0 6 8 1 40 1 93 0 0 0 27 28 18 17 38 2 288 -72 0 4 9 0 50 45 - 0 25 43 1 20 32 94 0 0 0 7 46 18 17 38 1 288 -72 - 0 15 33 0 31 5 - 0 45 27 1 0 53 Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 1405-01156-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 25 07.5820 DE: +18 17 22.921 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .025 ) * V mag [mag]: 10.7 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (667) Denise approx. diameter [km]: 81 approx. diameter ["]: .044 distance from Earth [AU]: 2.53000 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 677 number of rejected observations: 51 time covered by the observations: 1908 Jul 23 - 2008 Apr 17 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.013, 80° remarks: * orbital elements for (667) Denise : Mean anomaly = 42.05600036 deg Arg. of pericenter = 306.59218957 deg Long. of node = 153.34069634 deg Inclination = 25.40512989 deg Eccentricity = 0.19207348 Semimajor axis = 3.18200731 AU Perihelion dist = 2.57082809 AU Mag: H = 9.28, G = 0.15 Epoch of elements : MJD 54589.75700000 TDT (2008 May 03.757) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 3 667 Denise 18h 10.8m UT 10.7 9 25 7.582 18 17 22.92TYC 1405-01156-1 11.8 14.2 81 5.2 2.530 2.118 4.08 6.5602 18.288 -93.50 15.95 18.1806 0.01761 -0.13621 8.67571 1.17501 0.00538 -0.00178 2000 40.3617852008 424.00000306.592190153.340696 25.4051300.19207348 3.1820073 2.5708281 8.9 5.00.15 RATE 1.7364100 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.028 84 1.64 0.028 0 54579.5020080503_1156-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 03:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org