IOTA/IOTA-ES occultation update for (584) Semiramis / TYC 2367-01800-1 event on 2007 Oct 02, 17:08 UT Visible from Russia, China Summary ------- On 2007 Oct 02 UT, the 54 km diameter asteroid (584) Semiramis will occult a 11.7 mag star in the constellation Perseus for observers along a path across Russia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 11.3 mag (the magnitude of the asteroid) for at most 19.7 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: 91 * date and approx. time of event: 2007 Oct 02, 16:37 - 2007 Oct 02, 17:35 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 19.7 * Moon: 58 % sunlit, 30° distance * Sun: 125° distance * rough path description: Russia, China The occultation path -------------------- * approximate projected width [km]: 70 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 8.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .026", 90° ) * approx speed of asteroid's shadow [km/s]: 2.7390 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2367-01800-1 by 584 Semiramis on 2007 Oct 02 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 80 15 8 - 6 30 34 16 37 28 8 51 -61 79 9 4 - 7 9 21 81 12 41 - 5 58 25 77 46 13 - 8 0 51 82 5 32 - 5 30 12 83 18 44 - 2 56 18 16 38 13 13 51 -65 82 36 34 - 3 16 24 83 58 47 - 2 37 53 81 50 57 - 3 38 58 84 37 48 - 2 20 33 85 17 5 - 0 13 49 16 38 58 16 51 -67 84 42 15 - 0 28 4 85 50 50 - 0 0 27 84 5 28 - 0 43 36 86 24 16 0 12 23 86 46 40 2 5 24 16 39 43 19 51 -69 86 15 37 1 54 15 87 17 0 2 15 58 85 43 10 1 42 13 87 47 17 2 26 12 87 59 3 4 10 31 16 40 28 21 52 -71 87 30 21 4 1 20 88 27 13 4 19 16 87 0 31 3 51 29 88 55 28 4 27 46 88 59 40 6 5 53 16 41 13 23 52 -72 88 32 35 5 58 5 89 26 21 6 13 19 88 4 32 5 49 46 89 53 11 6 20 35 89 51 38 7 54 0 16 41 58 25 53 -73 89 25 43 7 47 15 90 17 14 8 0 28 88 58 55 7 40 3 90 43 0 8 6 46 90 36 52 9 36 28 16 42 43 27 53 -73 90 11 49 9 30 31 91 1 38 9 42 9 89 45 57 9 24 12 91 26 37 9 47 42 91 16 40 11 14 21 16 43 28 29 54 -73 90 52 16 11 9 4 91 40 48 11 19 24 90 27 8 11 3 27 92 5 11 11 24 20 91 51 58 12 48 27 16 44 13 30 54 -73 91 28 5 12 43 43 92 15 37 12 52 58 91 3 30 12 38 40 92 39 32 12 57 24 92 23 27 14 19 20 16 44 58 32 55 -73 91 59 58 14 15 4 92 46 43 14 23 26 91 35 49 14 10 31 93 10 16 14 27 25 92 51 38 15 47 29 16 45 43 33 56 -72 92 28 28 15 43 37 93 14 37 15 51 12 92 4 39 15 39 28 93 37 53 15 54 49 93 16 56 17 13 16 16 46 28 34 56 -72 92 54 1 17 9 43 93 39 42 17 16 39 92 30 27 17 5 56 94 2 45 17 19 56 93 39 41 18 36 57 16 47 13 35 57 -71 93 16 56 18 33 42 94 2 17 18 40 3 92 53 33 18 30 13 94 25 10 18 43 3 94 0 7 19 58 47 16 47 58 36 58 -70 93 37 30 19 55 48 94 22 36 20 1 38 93 14 16 19 52 36 94 45 23 20 4 23 94 18 28 21 18 59 16 48 43 38 59 -69 93 55 56 21 16 14 94 40 53 21 21 36 93 32 47 21 13 16 95 3 35 21 24 8 94 34 54 22 37 43 16 49 28 39 60 -69 94 12 24 22 35 10 94 57 16 22 40 8 93 49 18 22 32 25 95 19 57 22 42 28 94 49 34 23 55 8 16 50 13 40 61 -68 94 27 4 23 52 46 95 11 56 23 57 23 94 3 59 23 50 13 95 34 37 23 59 32 95 2 35 25 11 22 16 50 58 41 62 -67 94 40 3 25 9 10 95 24 59 25 13 27 94 16 57 25 6 47 95 47 42 25 15 26 95 14 2 26 26 31 16 51 43 41 63 -66 94 51 28 26 24 28 95 36 30 26 28 27 94 28 18 26 22 14 95 59 17 26 30 18 95 24 2 27 40 42 16 52 28 42 64 -65 95 1 22 27 38 47 95 46 34 27 42 30 94 38 8 27 36 42 96 9 26 27 44 13 95 32 37 28 54 0 16 53 13 43 65 -64 95 9 51 28 52 12 95 55 16 28 55 41 94 46 30 28 50 15 96 18 15 28 57 17 95 39 51 30 6 30 16 53 58 44 66 -62 95 16 57 30 4 48 96 2 39 30 8 4 94 53 29 30 2 58 96 25 46 30 9 33 95 45 48 31 18 16 16 54 43 44 67 -61 95 22 44 31 16 40 96 8 45 31 19 44 94 59 6 31 14 56 96 32 2 31 21 7 95 50 28 32 29 22 16 55 28 45 68 -60 95 27 14 32 27 52 96 13 36 32 30 45 95 3 25 32 26 13 96 37 5 32 32 3 95 53 54 33 39 51 16 56 13 46 69 -59 95 30 28 33 38 26 96 17 15 33 41 10 95 6 26 33 36 52 96 40 56 33 42 23 95 56 7 34 49 48 16 56 58 46 70 -58 95 32 26 34 48 27 96 19 41 34 51 2 95 8 11 34 46 58 96 43 37 34 52 11 95 57 6 35 59 15 16 57 42 47 72 -57 95 33 11 35 57 58 96 20 56 36 0 25 95 8 40 35 56 33 96 45 7 36 1 30 95 56 53 37 8 15 16 58 27 47 73 -56 95 32 41 37 7 1 96 20 59 37 9 21 95 7 53 37 5 39 96 45 28 37 10 22 95 55 27 38 16 50 16 59 12 48 74 -55 95 30 56 38 15 39 96 19 51 38 17 53 95 5 50 38 14 21 96 44 38 38 18 52 95 52 46 39 25 3 16 59 57 48 75 -54 95 27 56 39 23 55 96 17 30 39 26 4 95 2 29 39 22 39 96 42 37 39 26 59 95 48 50 40 32 57 17 0 42 49 77 -53 95 23 39 40 31 51 96 13 55 40 33 55 94 57 50 40 30 37 96 39 24 40 34 48 95 43 37 41 40 33 17 1 27 49 78 -52 95 18 3 41 39 29 96 9 5 41 41 29 94 51 51 41 38 17 96 34 57 41 42 21 95 37 4 42 47 53 17 2 12 49 79 -51 95 11 5 42 46 51 96 2 57 42 48 48 94 44 28 42 45 40 96 29 15 42 49 38 95 29 9 43 55 0 17 2 57 49 81 -49 95 2 43 43 53 59 95 55 29 43 55 54 94 35 39 43 52 49 96 22 13 43 56 43 95 19 48 45 1 55 17 3 42 50 82 -48 94 52 54 45 0 54 95 46 36 45 2 48 94 25 20 44 59 45 96 13 50 45 3 36 95 8 57 46 8 40 17 4 27 50 83 -47 94 41 32 46 7 39 95 36 16 46 9 33 94 13 27 46 6 30 96 4 1 46 10 20 94 56 32 47 15 16 17 5 12 50 84 -46 94 28 33 47 14 15 95 24 23 47 16 9 93 59 54 47 13 5 95 52 41 47 16 57 94 42 26 48 21 45 17 5 57 50 86 -45 94 13 52 48 20 44 95 10 52 48 22 39 93 44 37 48 19 33 95 39 46 48 23 27 94 26 32 49 28 9 17 6 42 50 87 -44 93 57 21 49 27 6 94 55 37 49 29 4 93 27 27 49 25 54 95 25 10 49 29 53 94 8 45 50 34 28 17 7 27 50 88 -43 93 38 53 50 33 23 94 38 31 50 35 25 93 8 17 50 32 9 95 8 45 50 36 15 93 48 55 51 40 44 17 8 12 50 89 -42 93 18 18 51 39 37 94 19 24 51 41 43 92 46 58 51 38 20 94 50 22 51 42 35 93 26 51 52 46 57 17 8 57 50 91 -41 92 55 27 52 45 48 93 58 7 52 47 59 92 23 19 52 44 28 94 29 54 52 48 54 93 2 23 53 53 10 17 9 42 49 92 -39 92 30 8 53 51 57 93 34 29 53 54 15 91 57 8 53 50 33 94 7 7 53 55 13 92 35 16 54 59 22 17 10 27 49 93 -38 92 2 7 54 58 4 93 8 18 55 0 31 91 28 11 54 56 36 93 41 51 55 1 33 92 5 16 56 5 34 17 11 12 49 94 -37 91 31 9 56 4 11 92 39 17 56 6 48 90 56 12 56 2 37 93 13 50 56 7 55 91 32 5 57 11 47 17 11 57 49 95 -36 90 56 54 57 10 18 92 7 9 57 13 7 90 20 52 57 8 37 92 42 48 57 14 19 90 55 22 58 18 0 17 12 42 48 96 -35 90 19 2 58 16 24 91 31 35 58 19 27 89 41 50 58 14 36 92 8 23 58 20 45 90 14 42 59 24 14 17 13 27 48 96 -34 89 37 7 59 22 29 90 52 10 59 25 48 88 58 40 59 20 32 91 30 14 59 27 15 89 29 38 60 30 28 17 14 12 48 97 -33 88 50 42 60 28 33 90 8 26 60 32 11 88 10 52 60 26 26 90 47 53 60 33 46 88 39 35 61 36 40 17 14 57 47 98 -32 87 59 11 61 34 35 89 19 51 61 38 34 87 17 52 61 32 15 90 0 48 61 40 19 87 43 54 62 42 49 17 15 42 47 98 -30 87 1 55 62 40 31 88 25 46 62 44 56 86 18 59 62 37 58 89 8 21 62 46 53 86 41 50 63 48 53 17 16 27 46 99 -29 85 58 7 63 46 20 87 25 26 63 51 14 85 13 25 63 43 31 88 9 48 63 53 25 85 32 26 64 54 48 17 17 12 46 99 -28 84 46 50 64 51 58 86 17 57 64 57 25 84 0 14 64 48 51 87 4 15 64 59 53 84 14 38 66 0 30 17 17 57 45 99 -27 83 26 59 65 57 19 85 2 12 66 3 26 82 38 18 65 53 51 85 50 38 66 6 12 82 47 5 67 5 51 17 18 42 44 99 -26 81 57 12 67 2 18 83 36 55 67 9 10 81 6 17 66 58 25 84 27 40 67 12 18 81 8 15 68 10 44 17 19 27 44 98 -25 80 15 57 68 6 44 82 0 31 68 14 28 79 22 35 68 2 23 82 53 48 68 18 2 79 16 13 69 14 57 17 20 12 43 98 -23 78 21 18 69 10 25 80 11 9 69 19 12 77 25 20 69 5 32 81 7 11 69 23 15 77 8 43 70 18 15 17 20 57 42 97 -22 76 11 1 70 13 7 78 6 30 70 23 5 75 12 16 70 7 35 79 5 31 70 27 43 74 43 4 71 20 19 17 21 42 41 95 -21 73 42 24 71 14 28 75 43 53 71 25 50 72 40 44 71 8 11 76 46 5 71 31 9 71 56 3 72 20 42 17 22 26 40 94 -20 70 52 20 72 14 1 73 0 2 72 27 2 69 47 41 72 6 52 74 5 35 72 33 9 68 43 57 73 18 50 17 23 11 39 92 -18 67 37 12 73 11 11 69 51 8 73 26 7 66 29 36 73 3 2 71 0 7 73 33 11 65 2 34 74 13 58 17 23 56 38 89 -17 63 52 58 74 5 12 66 12 50 74 22 22 62 42 39 73 55 52 67 25 8 74 30 33 60 47 26 75 5 9 17 24 41 37 86 -16 59 35 27 74 55 4 62 0 21 75 14 50 58 22 57 74 44 23 63 15 38 75 24 18 55 54 15 75 51 7 17 25 26 36 82 -14 54 40 44 75 39 32 57 8 58 76 2 18 53 27 1 75 27 19 58 26 26 76 13 17 50 19 40 76 30 22 17 26 11 35 77 -13 49 6 4 76 17 6 51 34 49 76 43 13 47 52 34 76 3 9 52 53 4 76 55 55 44 2 39 77 1 3 17 26 56 34 72 -12 42 51 0 76 45 56 45 16 9 77 15 46 41 39 45 76 30 6 46 33 4 77 30 22 37 6 3 77 21 8 17 27 41 33 66 -10 35 58 54 77 4 3 38 15 13 77 37 49 34 52 24 76 46 14 39 27 57 77 54 27 29 37 57 77 28 29 17 28 26 31 59 -9 28 38 4 77 9 25 30 39 51 77 47 12 27 38 56 76 49 36 31 45 10 78 5 55 21 51 54 77 21 11 17 29 11 30 53 -7 21 1 40 77 0 11 22 43 52 77 41 52 20 12 5 76 38 24 23 38 48 78 2 36 14 5 2 76 57 43 17 29 56 28 46 -6 13 25 52 76 34 53 14 45 28 77 20 14 12 47 5 76 11 15 15 28 6 77 42 52 6 34 41 76 17 4 17 30 41 27 39 -4 6 6 44 75 52 31 7 3 19 76 41 16 5 38 49 75 27 7 7 33 17 77 5 37 - 0 25 13 75 18 35 17 31 26 25 33 -2 - 0 42 59 74 52 23 - 0 7 21 75 44 25 - 1 1 1 74 25 13 0 11 0 76 10 22 - 6 46 9 74 1 40 17 32 11 23 27 0 - 6 55 27 73 33 40 - 6 37 12 74 29 10 - 7 5 19 73 4 35 - 6 28 27 74 56 46 - 12 24 59 72 25 6 17 32 56 21 22 1 - 12 27 52 71 54 57 - 12 22 48 72 54 37 - 12 31 31 71 23 31 - 12 21 19 73 24 7 - 17 22 47 70 26 19 17 33 41 18 18 4 - 17 21 14 69 53 12 - 17 25 16 70 58 33 - 17 20 39 69 18 26 - 17 28 48 71 30 35 - 21 43 20 67 59 35 17 34 26 16 14 6 - 21 39 18 67 21 45 - 21 48 33 68 36 3 - 21 36 25 66 41 33 - 21 55 4 69 11 57 - 25 32 31 64 51 15 17 35 11 12 11 9 - 25 28 6 64 4 11 - 25 38 27 65 35 35 - 25 25 20 63 12 48 - 25 46 1 66 18 27 - 29 0 54 60 15 25 17 35 56 7 8 12 - 29 1 17 58 57 22 - 29 3 55 61 22 11 - 29 7 18 57 16 36 - 29 9 37 62 22 36 Data for the target star ------------------------ * name: TYC 2367-01800-1 * constellation : Perseus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 42 16.3969 DE: +37 00 29.076 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .020 ) * V mag [mag]: 11.7 * B mag [mag]: 12.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (584) Semiramis approx. diameter [km]: 54 approx. diameter ["]: .068 distance from Earth [AU]: 1.09700 * orbital information: orbit source: Preston date of fit: 2007 Sep 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 596 number of rejected observations: 74 time covered by the observations: 1906 Jan 15 - 2007 Sep 13 1 sigma uncertainty ellipse (major, minor, PA): 0.035, 0.016, 90° remarks: * orbital elements for (584) Semiramis : Mean anomaly = 17.55558615 deg Arg. of pericenter = 84.86901520 deg Long. of node = 282.29799197 deg Inclination = 10.72759220 deg Eccentricity = 0.23300333 Semimajor axis = 2.37388819 AU Perihelion dist = 1.82076434 AU Mag: H = 8.50, G = 0.24 Epoch of elements : MJD 54375.71400000 TDT (2007 Oct 02.714) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Oct 02 584 Semiramis 17h 6.7m UT 11.7 3 42 16.397 37 0 29.08TYC 2367-01800-1 12.8 11.3 54 19.7 1.097 0.596 10.11 -212.146 37.006 -79.32 -3.62 17.1117 -.52370 .37081 0.89377 1.26143 -0.00374 -0.00182 2000 16.01582282007 927.00000 84.869015282.297992 10.7275920.233003332.373888191.820764348.715 0.24 RATE 2.6947202 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.040 0.026 90.0 1.510 0.035 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Sep 25, 22:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org