IOTA/IOTA-ES occultation update for (352) Gisela / TYC 1880-00420-1 event on 2009 Sep 01, 09:18 UT Visible from Summary ------- On 2009 Sep 01 UT, the 20 km diameter asteroid (352) Gisela will occult a 9.7 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.7 mag to 14.4 mag (the magnitude of the asteroid) for at most 0.6 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: 38 * date and approx. time of event: 2009 Sep 01, 09:15 - 2009 Sep 01, 09:17 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 4.7 * estimated maximum duration [s]: 0.6 * Moon: 90 % sunlit, 156° distance * Sun: 61° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 1.72 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .024", .022", 94° ) * approx speed of asteroid's shadow [km/s]: 33.1333 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1880-00420-1 by 352 Gisela on 2009 Sep 1 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 -119 0 0 19 11 19 9 15 31 0 66 -56 19 5 8 19 17 29 18 43 56 19 38 45 -118 0 0 19 37 10 9 15 31 1 66 -56 19 31 0 19 43 20 19 9 48 20 4 36 -117 0 0 20 2 53 9 15 31 2 66 -55 19 56 43 20 9 4 19 35 32 20 30 18 -116 0 0 20 28 28 9 15 31 3 67 -54 20 22 18 20 34 38 20 1 8 20 55 52 -115 0 0 20 53 54 9 15 31 4 67 -53 20 47 44 21 0 4 20 26 35 21 21 17 -114 0 0 21 19 10 9 15 32 6 67 -52 21 13 1 21 25 19 20 51 52 21 46 32 -113 0 0 21 44 15 9 15 32 7 68 -51 21 38 6 21 50 25 21 16 58 22 11 36 -112 0 0 22 9 10 9 15 32 8 68 -50 22 3 1 22 15 19 21 41 55 22 36 30 -111 0 0 22 33 54 9 15 33 9 69 -49 22 27 45 22 40 2 22 6 39 23 1 12 -110 0 0 22 58 25 9 15 33 10 69 -48 22 52 17 23 4 33 22 31 12 23 25 42 -109 0 0 23 22 44 9 15 34 11 69 -47 23 16 36 23 28 52 22 55 33 23 49 59 -108 0 0 23 46 50 9 15 35 12 70 -46 23 40 42 23 52 57 23 19 40 24 14 3 -107 0 0 24 10 42 9 15 35 13 70 -45 24 4 35 24 16 49 23 43 34 24 37 54 -106 0 0 24 34 21 9 15 36 14 71 -44 24 28 14 24 40 27 24 7 15 25 1 30 -105 0 0 24 57 45 9 15 37 15 71 -43 24 51 39 25 3 51 24 30 41 25 24 53 -104 0 0 25 20 54 9 15 38 16 71 -42 25 14 48 25 27 0 24 53 52 25 48 0 -103 0 0 25 43 48 9 15 39 17 72 -41 25 37 43 25 49 54 25 16 48 26 10 52 -102 0 0 26 6 26 9 15 40 17 72 -40 26 0 22 26 12 31 25 39 29 26 33 28 -101 0 0 26 28 49 9 15 41 18 73 -40 26 22 45 26 34 53 26 1 53 26 55 48 -100 0 0 26 50 55 9 15 42 19 73 -39 26 44 51 26 56 59 26 24 1 27 17 52 - 99 0 0 27 12 44 9 15 43 20 74 -38 27 6 40 27 18 47 26 45 52 27 39 38 - 98 0 0 27 34 16 9 15 44 21 74 -37 27 28 13 27 40 18 27 7 27 28 1 8 - 97 0 0 27 55 30 9 15 46 22 75 -36 27 49 28 28 1 32 27 28 44 28 22 20 - 96 0 0 28 16 27 9 15 47 23 75 -35 28 10 25 28 22 28 27 49 43 28 43 14 - 95 0 0 28 37 5 9 15 48 24 76 -34 28 31 4 28 43 6 28 10 24 29 3 50 - 94 0 0 28 57 26 9 15 50 25 76 -33 28 51 25 29 3 26 28 30 47 29 24 8 - 93 0 0 29 17 27 9 15 51 26 77 -32 29 11 27 29 23 27 28 50 51 29 44 7 - 92 0 0 29 37 10 9 15 52 27 77 -31 29 31 11 29 43 9 29 10 36 30 3 47 - 91 0 0 29 56 34 9 15 54 28 78 -30 29 50 35 30 2 32 29 30 3 30 23 8 - 90 0 0 30 15 38 9 15 55 29 79 -29 30 9 40 30 21 36 29 49 10 30 42 10 - 89 0 0 30 34 23 9 15 57 30 79 -28 30 28 25 30 40 20 30 7 57 31 0 52 - 88 0 0 30 52 48 9 15 59 31 80 -28 30 46 51 30 58 45 30 26 25 31 19 14 - 87 0 0 31 10 53 9 16 0 32 80 -27 31 4 57 31 16 49 30 44 33 31 37 17 - 86 0 0 31 28 38 9 16 2 32 81 -26 31 22 43 31 34 34 31 2 21 31 54 59 - 85 0 0 31 46 3 9 16 4 33 82 -25 31 40 8 31 51 58 31 19 48 32 12 21 - 84 0 0 32 3 8 9 16 5 34 82 -24 31 57 13 32 9 2 31 36 56 32 29 23 - 83 0 0 32 19 52 9 16 7 35 83 -23 32 13 58 32 25 46 31 53 43 32 46 4 - 82 0 0 32 36 15 9 16 9 36 84 -22 32 30 22 32 42 9 32 10 9 33 2 25 - 81 0 0 32 52 18 9 16 11 37 84 -21 32 46 26 32 58 11 32 26 14 33 18 25 - 80 0 0 33 8 0 9 16 13 38 85 -20 33 2 8 33 13 52 32 41 59 33 34 5 - 79 0 0 33 23 21 9 16 15 39 86 -20 33 17 30 33 29 13 32 57 23 33 49 23 - 78 0 0 33 38 21 9 16 17 39 86 -19 33 32 31 33 44 12 33 12 26 34 4 20 - 77 0 0 33 53 0 9 16 19 40 87 -18 33 47 10 33 58 51 33 27 7 34 18 57 - 76 0 0 34 7 18 9 16 20 41 88 -17 34 1 29 34 13 8 33 41 28 34 33 12 - 75 0 0 34 21 15 9 16 22 42 89 -16 34 15 26 34 27 4 33 55 27 34 47 6 - 74 0 0 34 34 51 9 16 25 43 89 -15 34 29 3 34 40 39 34 9 6 35 0 39 - 73 0 0 34 48 5 9 16 27 44 90 -14 34 42 18 34 53 53 34 22 23 35 13 51 - 72 0 0 35 0 58 9 16 29 44 91 -14 34 55 11 35 6 46 34 35 18 35 26 42 - 71 0 0 35 13 30 9 16 31 45 92 -13 35 7 44 35 19 17 34 47 53 35 39 11 - 70 0 0 35 25 41 9 16 33 46 92 -12 35 19 55 35 31 27 35 0 5 35 51 19 - 69 0 0 35 37 30 9 16 35 47 93 -11 35 31 44 35 43 15 35 11 57 36 3 6 - 68 0 0 35 48 58 9 16 37 48 94 -10 35 43 13 35 54 43 35 23 27 36 14 31 - 67 0 0 36 0 4 9 16 39 48 95 -9 35 54 20 36 5 49 35 34 36 36 25 35 - 66 0 0 36 10 49 9 16 42 49 96 -9 36 5 5 36 16 33 35 45 23 36 36 18 - 65 0 0 36 21 13 9 16 44 50 97 -8 36 15 30 36 26 57 35 55 49 36 46 40 - 64 0 0 36 31 15 9 16 46 51 98 -7 36 25 32 36 36 59 36 5 54 36 56 40 - 63 0 0 36 40 57 9 16 48 52 99 -6 36 35 14 36 46 39 36 15 37 37 6 19 - 62 0 0 36 50 16 9 16 50 52 100 -5 36 44 34 36 55 58 36 24 59 37 15 37 - 61 0 0 36 59 15 9 16 53 53 101 -4 36 53 33 37 4 56 36 33 59 37 24 33 - 60 0 0 37 7 52 9 16 55 54 102 -4 37 2 11 37 13 33 36 42 38 37 33 8 - 59 0 0 37 16 8 9 16 57 55 103 -3 37 10 27 37 21 49 36 50 56 37 41 22 - 58 0 0 37 24 2 9 17 0 55 104 -2 37 18 22 37 29 43 36 58 52 37 49 15 - 57 0 0 37 31 36 9 17 2 56 105 -1 37 25 56 37 37 16 37 6 28 37 56 47 - 56 0 0 37 38 48 9 17 4 57 106 0 37 33 8 37 44 28 37 13 41 38 3 58 Uncertainty in time = +/- 1 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 1880-00420-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 33 46.8377 DE: +23 03 25.689 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .020 ) * V mag [mag]: 9.7 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (352) Gisela approx. diameter [km]: 20 approx. diameter ["]: .013 distance from Earth [AU]: 2.19300 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 849 number of rejected observations: 93 time covered by the observations: 1913 Apr 23 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.009, 97° remarks: * orbital elements for (352) Gisela : Mean anomaly = 28.95797468 deg Arg. of pericenter = 144.21698183 deg Long. of node = 247.39406844 deg Inclination = 3.38018900 deg Eccentricity = 0.14907997 Semimajor axis = 2.19405034 AU Perihelion dist = 1.86696137 AU Mag: H = 10.01, G = 0.15 Epoch of elements : MJD 55075.38800000 TDT (2009 Sep 01.388) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 1 352 Gisela 9h 18.6m UT 9.7 6 33 46.838 23 3 25.69TYC 1880-00420-1 10.2 14.4 20 0.6 2.193 5.406 -7.50 -21.8829 23.060 40.35 8.16 9.3102 0.02665 0.25568 18.60782 -1.86825 -0.00441 0.00025 2000 27.3239382009 827.00000144.216982247.394068 3.3801890.14907997 2.1940503 1.866961410.0 5.00.15 RATE 3.0327340 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.024 0.022 94 2.72 0.022 0 54581.5020090901_0420-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 08:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org