IOTA/IOTA-ES occultation update for (820) Adriana / TYC 1895-00397-1 event on 2009 Apr 12, 14:04 UT Visible from Summary ------- On 2009 Apr 12 UT, the 59 km diameter asteroid (820) Adriana will occult a 11.4 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 5.7 mag to 17.1 mag (the magnitude of the asteroid) for at most 3.1 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: 53 * date and approx. time of event: 2009 Apr 12, 14:05 - 2009 Apr 12, 14:10 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 3.1 * Moon: 91 % sunlit, 133° distance * Sun: 82° distance * rough path description: Additional comments ------------------- 10" double star The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 1.19 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .030", 90° ) * approx speed of asteroid's shadow [km/s]: 18.9215 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1895-00397-1 by 820 Adriana on 2009 Apr 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 62 0 0 19 11 40 14 5 42 81 298 0 18 55 35 19 27 44 18 17 17 20 5 59 63 0 0 19 6 24 14 5 48 80 296 -1 18 50 18 19 22 29 18 11 59 20 0 45 64 0 0 19 0 43 14 5 53 79 295 -2 18 44 37 19 16 49 18 6 16 19 55 7 65 0 0 18 54 39 14 5 59 78 294 -3 18 38 32 19 10 46 18 0 9 19 49 5 66 0 0 18 48 10 14 6 5 78 293 -4 18 32 2 19 4 17 17 53 38 19 42 39 67 0 0 18 41 17 14 6 10 77 292 -5 18 25 8 18 57 25 17 46 42 19 35 49 68 0 0 18 33 59 14 6 16 76 291 -6 18 17 50 18 50 9 17 39 21 19 28 34 69 0 0 18 26 18 14 6 21 75 291 -7 18 10 8 18 42 28 17 31 37 19 20 56 70 0 0 18 18 12 14 6 27 74 290 -8 18 2 1 18 34 23 17 23 28 19 12 53 71 0 0 18 9 43 14 6 33 73 290 -9 17 53 30 18 25 54 17 14 55 19 4 27 72 0 0 18 0 49 14 6 38 72 289 -10 17 44 35 18 17 2 17 5 58 18 55 36 73 0 0 17 51 31 14 6 44 71 289 -11 17 35 17 18 7 45 16 56 36 18 46 22 74 0 0 17 41 49 14 6 49 70 289 -12 17 25 34 17 58 4 16 46 51 18 36 44 75 0 0 17 31 44 14 6 55 69 289 -13 17 15 27 17 48 0 16 36 42 18 26 42 76 0 0 17 21 14 14 7 0 68 289 -14 17 4 57 17 37 32 16 26 8 18 16 17 77 0 0 17 10 21 14 7 5 67 289 -15 16 54 2 17 26 40 16 15 11 18 5 28 78 0 0 16 59 5 14 7 11 66 289 -16 16 42 45 17 15 25 16 3 51 17 54 15 79 0 0 16 47 25 14 7 16 65 289 -17 16 31 3 17 3 46 15 52 6 17 42 40 80 0 0 16 35 21 14 7 21 64 289 -18 16 18 58 16 51 43 15 39 58 17 30 40 81 0 0 16 22 54 14 7 27 63 289 -19 16 6 30 16 39 18 15 27 27 17 18 18 82 0 0 16 10 4 14 7 32 62 289 -20 15 53 38 16 26 29 15 14 32 17 5 32 83 0 0 15 56 50 14 7 37 61 289 -21 15 40 24 16 13 17 15 1 14 16 52 23 84 0 0 15 43 14 14 7 42 60 289 -22 15 26 46 15 59 42 14 47 33 16 38 52 85 0 0 15 29 15 14 7 48 59 289 -23 15 12 45 15 45 44 14 33 29 16 24 58 86 0 0 15 14 53 14 7 53 58 289 -24 14 58 22 15 31 24 14 19 2 16 10 41 87 0 0 15 0 9 14 7 58 57 289 -25 14 43 36 15 16 41 14 4 13 15 56 1 88 0 0 14 45 2 14 8 3 56 290 -26 14 28 28 15 1 36 13 49 1 15 41 0 89 0 0 14 29 33 14 8 8 55 290 -27 14 12 58 14 46 8 13 33 28 15 25 36 90 0 0 14 13 42 14 8 13 54 290 -28 13 57 6 14 30 19 13 17 32 15 9 50 91 0 0 13 57 30 14 8 17 53 290 -29 13 40 51 14 14 8 13 1 14 14 53 42 92 0 0 13 40 55 14 8 22 52 290 -30 13 24 15 13 57 35 12 44 34 14 37 13 93 0 0 13 24 0 14 8 27 51 290 -31 13 7 18 13 40 41 12 27 33 14 20 23 94 0 0 13 6 43 14 8 32 50 290 -32 12 50 0 13 23 26 12 10 11 14 3 11 95 0 0 12 49 5 14 8 36 49 290 -33 12 32 21 13 5 49 11 52 28 13 45 38 96 0 0 12 31 7 14 8 41 48 291 -34 12 14 21 12 47 52 11 34 25 13 27 45 97 0 0 12 12 48 14 8 45 47 291 -35 11 56 0 12 29 35 11 16 1 13 9 32 98 0 0 11 54 9 14 8 50 46 291 -36 11 37 20 12 10 58 10 57 17 12 50 58 99 0 0 11 35 10 14 8 54 45 291 -37 11 18 19 11 52 1 10 38 13 12 32 4 100 0 0 11 15 52 14 8 58 44 291 -38 10 59 0 11 32 44 10 18 49 12 12 51 101 0 0 10 56 15 14 9 3 43 291 -39 10 39 21 11 13 8 9 59 7 11 53 19 102 0 0 10 36 18 14 9 7 42 291 -40 10 19 23 10 53 13 9 39 5 11 33 28 103 0 0 10 16 4 14 9 11 40 292 -41 9 59 7 10 33 0 9 18 46 11 13 18 104 0 0 9 55 31 14 9 15 39 292 -42 9 38 32 10 12 29 8 58 8 10 52 50 105 0 0 9 34 40 14 9 19 38 292 -44 9 17 40 9 51 39 8 37 12 10 32 4 106 0 0 9 13 32 14 9 23 37 292 -45 8 56 31 9 30 33 8 15 59 10 11 1 107 0 0 8 52 7 14 9 26 36 292 -46 8 35 4 9 9 9 7 54 29 9 49 41 108 0 0 8 30 25 14 9 30 35 292 -47 8 13 22 8 47 29 7 32 43 9 28 4 109 0 0 8 8 28 14 9 34 34 292 -48 7 51 23 8 25 33 7 10 41 9 6 11 110 0 0 7 46 15 14 9 37 33 292 -49 7 29 8 8 3 21 6 48 23 8 44 2 111 0 0 7 23 46 14 9 41 32 293 -50 7 6 38 7 40 54 6 25 50 8 21 38 112 0 0 7 1 3 14 9 44 31 293 -51 6 43 54 7 18 12 6 3 3 7 58 59 113 0 0 6 38 5 14 9 47 30 293 -52 6 20 55 6 55 15 5 40 1 7 36 6 114 0 0 6 14 54 14 9 50 29 293 -53 5 57 42 6 32 5 5 16 46 7 12 59 115 0 0 5 51 30 14 9 53 28 293 -54 5 34 17 6 8 42 4 53 17 6 49 38 116 0 0 5 27 52 14 9 56 27 293 -55 5 10 38 5 45 6 4 29 36 6 26 5 117 0 0 5 4 3 14 9 59 25 293 -56 4 46 48 5 21 18 4 5 43 6 2 19 118 0 0 4 40 2 14 10 2 24 293 -57 4 22 46 4 57 18 3 41 39 5 38 22 119 0 0 4 15 50 14 10 4 23 293 -59 3 58 33 4 33 7 3 17 23 5 14 13 120 0 0 3 51 28 14 10 7 22 293 -60 3 34 10 4 8 45 2 52 58 4 49 54 121 0 0 3 26 55 14 10 9 21 293 -61 3 9 36 3 44 14 2 28 22 4 25 25 122 0 0 3 2 13 14 10 11 20 293 -62 2 44 54 3 19 33 2 3 38 4 0 46 123 0 0 2 37 23 14 10 13 19 293 -63 2 20 2 2 54 43 1 38 44 3 35 58 124 0 0 2 12 24 14 10 15 18 293 -64 1 55 3 2 29 45 1 13 43 3 11 2 125 0 0 1 47 18 14 10 17 17 294 -65 1 29 56 2 4 40 0 48 35 2 45 58 126 0 0 1 22 5 14 10 19 16 294 -66 1 4 43 1 39 28 0 23 20 2 20 48 127 0 0 0 56 46 14 10 21 15 294 -67 0 39 23 1 14 9 - 0 2 1 1 55 30 128 0 0 0 31 21 14 10 22 14 294 -68 0 13 58 0 48 45 - 0 27 28 1 30 7 129 0 0 0 5 52 14 10 24 12 294 -69 - 0 11 33 0 23 16 - 0 52 59 1 4 39 130 0 0 - 0 19 42 14 10 25 11 294 -71 - 0 37 7 - 0 2 18 - 1 18 35 0 39 7 131 0 0 - 0 45 20 14 10 26 10 294 -72 - 1 2 45 - 0 27 56 - 1 44 14 0 13 30 132 0 0 - 1 11 1 14 10 28 9 294 -73 - 1 28 26 - 0 53 36 - 2 9 56 - 0 12 10 133 0 0 - 1 36 44 14 10 28 8 293 -74 - 1 54 10 - 1 19 19 - 2 35 40 - 0 37 52 134 0 0 - 2 2 29 14 10 29 7 293 -75 - 2 19 55 - 1 45 4 - 3 1 25 - 1 3 37 135 0 0 - 2 28 15 14 10 30 6 293 -76 - 2 45 41 - 2 10 50 - 3 27 12 - 1 29 22 136 0 0 - 2 54 2 14 10 31 5 293 -77 - 3 11 28 - 2 36 36 - 3 52 58 - 1 55 8 137 0 0 - 3 19 48 14 10 31 4 293 -78 - 3 37 14 - 3 2 22 - 4 18 44 - 2 20 55 138 0 0 - 3 45 33 14 10 31 3 293 -79 - 4 2 59 - 3 28 8 - 4 44 30 - 2 46 40 139 0 0 - 4 11 17 14 10 32 2 293 -80 - 4 28 43 - 3 53 52 - 5 10 13 - 3 12 24 140 0 0 - 4 36 59 14 10 32 0 293 -81 - 4 54 24 - 4 19 33 - 5 35 54 - 3 38 7 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 1895-00397-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 03 26.6495 DE: +23 00 38.929 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .025 ) * V mag [mag]: 11.4 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (820) Adriana approx. diameter [km]: 59 approx. diameter ["]: .025 distance from Earth [AU]: 3.27900 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 974 number of rejected observations: 44 time covered by the observations: 1916 Mar 30 - 2008 Feb 02 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.016, 90° remarks: * orbital elements for (820) Adriana : Mean anomaly = 177.70542987 deg Arg. of pericenter = 185.64585846 deg Long. of node = 118.57118503 deg Inclination = 5.93775005 deg Eccentricity = 0.05135869 Semimajor axis = 3.13063119 AU Perihelion dist = 2.96984608 AU Mag: H = 10.32, G = 0.15 Epoch of elements : MJD 54933.58700000 TDT (2009 Apr 12.587) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 12 820 Adriana 14h 4.9m UT 11.4 7 3 26.650 23 0 38.93TYC 1895-00397-1 12.3 17.1 59 3.1 3.279 2.074 -0.86 53.7226 23.011 -31.05 8.87 14.0820 -0.00233 -0.06031 10.67503 -0.32072 0.00571 -0.00062 2000 177.0671852009 4 9.00000185.645858118.571185 5.9377500.05135869 3.1306312 2.969846111.0 5.00.15 RATE 1.7793290 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.030 90 2.19 0.029 0 54545.5020090412_0397-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 07:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org