IOTA/IOTA-ES occultation update for (1015) Christa / UCAC2 36823873 event on 2009 Dec 06, 06:54 UT Visible from Summary ------- On 2009 Dec 06 UT, the 97 km diameter asteroid (1015) Christa will occult a 11.7 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.6 mag (the magnitude of the asteroid) for at most 14.2 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: 83 * date and approx. time of event: 2009 Dec 06, 06:40 - 2009 Dec 06, 07:02 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 14.2 * Moon: 80 % sunlit, 19° distance * Sun: 108° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 104 * 1 sigma uncertainty interval [path widths]: +/- 0.62 * 1 sigma uncertainty interval [seconds]: +/- 10.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .030", 97° ) * approx speed of asteroid's shadow [km/s]: 6.8460 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 36823873 by 1015 Christa on 2009 Dec 6 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 10 57 57 6 40 32 1 76 -71 10 28 41 11 27 18 9 52 32 12 3 52 -117 0 0 11 13 38 6 40 33 2 76 -72 10 44 21 11 43 2 10 8 10 12 19 37 -116 0 0 11 29 33 6 40 34 3 76 -73 11 0 13 11 58 58 10 24 0 12 35 36 -115 0 0 11 45 40 6 40 35 4 76 -74 11 16 19 12 15 8 10 40 4 12 51 48 -114 0 0 12 2 1 6 40 36 5 76 -75 11 32 38 12 31 30 10 56 20 13 8 13 -113 0 0 12 18 34 6 40 38 6 77 -76 11 49 9 12 48 5 11 12 49 13 24 50 -112 0 0 12 35 19 6 40 40 7 77 -76 12 5 52 13 4 52 11 29 30 13 41 39 -111 0 0 12 52 16 6 40 42 8 77 -77 12 22 47 13 21 51 11 46 23 13 58 40 -110 0 0 13 9 24 6 40 45 9 77 -78 12 39 54 13 39 1 12 3 27 14 15 53 -109 0 0 13 26 44 6 40 48 10 78 -79 12 57 12 13 56 22 12 20 43 14 33 16 -108 0 0 13 44 14 6 40 51 11 78 -80 13 14 41 14 13 54 12 38 10 14 50 50 -107 0 0 14 1 55 6 40 55 12 78 -80 13 32 20 14 31 37 12 55 47 15 8 35 -106 0 0 14 19 46 6 40 59 13 78 -81 13 50 9 14 49 29 13 13 34 15 26 30 -105 0 0 14 37 47 6 41 3 14 79 -82 14 8 8 15 7 32 13 31 32 15 44 34 -104 0 0 14 55 57 6 41 7 15 79 -82 14 26 17 15 25 43 13 49 38 16 2 47 -103 0 0 15 14 16 6 41 12 16 79 -83 14 44 34 15 44 3 14 7 54 16 21 9 -102 0 0 15 32 43 6 41 17 17 80 -83 15 3 0 16 2 32 14 26 18 16 39 40 -101 0 0 15 51 18 6 41 23 18 80 -83 15 21 34 16 21 9 14 44 50 16 58 19 -100 0 0 16 10 1 6 41 29 19 80 -83 15 40 16 16 39 53 15 3 30 17 17 5 - 99 0 0 16 28 52 6 41 35 20 80 -83 15 59 5 16 58 45 15 22 17 17 35 58 - 98 0 0 16 47 49 6 41 41 21 81 -83 16 18 0 17 17 43 15 41 12 17 54 58 - 97 0 0 17 6 52 6 41 48 22 81 -82 16 37 3 17 36 48 16 0 13 18 14 4 - 96 0 0 17 26 1 6 41 55 23 82 -82 16 56 11 17 55 58 16 19 19 18 33 15 - 95 0 0 17 45 16 6 42 2 24 82 -81 17 15 24 18 15 13 16 38 32 18 52 32 - 94 0 0 18 4 35 6 42 10 25 82 -80 17 34 43 18 34 34 16 57 49 19 11 54 - 93 0 0 18 23 59 6 42 17 26 83 -80 17 54 6 18 53 59 17 17 11 19 31 20 - 92 0 0 18 43 27 6 42 26 27 83 -79 18 13 33 19 13 28 17 36 37 19 50 49 - 91 0 0 19 2 58 6 42 34 28 84 -78 18 33 4 19 33 0 17 56 7 20 10 23 - 90 0 0 19 22 33 6 42 43 29 84 -77 18 52 37 19 52 35 18 15 40 20 29 58 - 89 0 0 19 42 10 6 42 52 30 85 -77 19 12 14 20 12 12 18 35 15 20 49 37 - 88 0 0 20 1 49 6 43 1 31 85 -76 19 31 52 20 31 52 18 54 53 21 9 17 - 87 0 0 20 21 29 6 43 10 32 86 -75 19 51 32 20 51 32 19 14 32 21 28 58 - 86 0 0 20 41 10 6 43 20 33 86 -74 20 11 13 21 11 14 19 34 13 21 48 40 - 85 0 0 21 0 52 6 43 30 34 87 -73 20 30 55 21 30 56 19 53 54 22 8 23 - 84 0 0 21 20 34 6 43 40 35 87 -72 20 50 36 21 50 38 20 13 36 22 28 5 - 83 0 0 21 40 15 6 43 51 36 88 -71 21 10 17 22 10 20 20 33 17 22 47 46 - 82 0 0 21 59 56 6 44 2 37 88 -70 21 29 58 22 30 0 20 52 57 23 7 27 - 81 0 0 22 19 34 6 44 13 38 89 -69 21 49 36 22 49 39 21 12 36 23 27 5 - 80 0 0 22 39 11 6 44 24 39 90 -68 22 9 13 23 9 15 21 32 13 23 46 41 - 79 0 0 22 58 45 6 44 35 40 90 -67 22 28 48 23 28 49 21 51 47 24 6 15 - 78 0 0 23 18 16 6 44 47 41 91 -67 22 48 19 23 48 20 22 11 19 24 25 45 - 77 0 0 23 37 44 6 44 58 42 92 -66 23 7 47 24 7 47 22 30 48 24 45 12 - 76 0 0 23 57 7 6 45 10 43 93 -65 23 27 11 24 27 10 22 50 12 25 4 34 - 75 0 0 24 16 26 6 45 23 44 93 -64 23 46 31 24 46 28 23 9 33 25 23 52 - 74 0 0 24 35 40 6 45 35 45 94 -63 24 5 45 25 5 42 23 28 48 25 43 4 - 73 0 0 24 54 49 6 45 47 46 95 -62 24 24 55 25 24 49 23 47 58 26 2 11 - 72 0 0 25 13 51 6 46 0 47 96 -61 24 43 58 25 43 51 24 7 3 26 21 12 - 71 0 0 25 32 48 6 46 13 48 97 -60 25 2 55 26 2 46 24 26 1 26 40 6 - 70 0 0 25 51 37 6 46 26 49 98 -59 25 21 45 26 21 35 24 44 52 26 58 53 - 69 0 0 26 10 19 6 46 39 50 99 -58 25 40 28 26 40 15 25 3 37 27 17 32 - 68 0 0 26 28 53 6 46 52 50 100 -57 25 59 4 26 58 49 25 22 13 27 36 4 - 67 0 0 26 47 19 6 47 6 51 101 -56 26 17 31 27 17 13 25 40 42 27 54 27 - 66 0 0 27 5 36 6 47 19 52 102 -55 26 35 50 27 35 29 25 59 2 28 12 42 - 65 0 0 27 23 45 6 47 33 53 103 -54 26 53 59 27 53 36 26 17 14 28 30 47 - 64 0 0 27 41 44 6 47 47 54 104 -53 27 12 0 28 11 34 26 35 16 28 48 42 - 63 0 0 27 59 33 6 48 1 55 105 -52 27 29 50 28 29 21 26 53 8 29 6 28 - 62 0 0 28 17 11 6 48 15 56 107 -51 27 47 30 28 46 59 27 10 50 29 24 3 - 61 0 0 28 34 40 6 48 29 56 108 -51 28 5 0 29 4 25 27 28 22 29 41 28 - 60 0 0 28 51 57 6 48 43 57 109 -50 28 22 19 29 21 41 27 45 43 29 58 41 - 59 0 0 29 9 3 6 48 57 58 111 -49 28 39 27 29 38 45 28 2 53 30 15 43 - 58 0 0 29 25 57 6 49 12 59 112 -48 28 56 23 29 55 37 28 19 51 30 32 34 - 57 0 0 29 42 39 6 49 26 59 114 -47 29 13 7 30 12 18 28 36 37 30 49 12 - 56 0 0 29 59 9 6 49 40 60 115 -46 29 29 39 30 28 46 28 53 11 31 5 37 - 55 0 0 30 15 27 6 49 55 61 117 -45 29 45 58 30 45 1 29 9 33 31 21 50 - 54 0 0 30 31 31 6 50 9 61 119 -44 30 2 4 31 1 4 29 25 42 31 37 50 - 53 0 0 30 47 22 6 50 24 62 121 -43 30 17 58 31 16 53 29 41 37 31 53 37 - 52 0 0 31 3 0 6 50 39 63 123 -42 30 33 37 31 32 29 29 57 19 32 9 10 - 51 0 0 31 18 24 6 50 53 63 124 -41 30 49 3 31 47 51 30 12 48 32 24 29 - 50 0 0 31 33 34 6 51 8 64 127 -41 31 4 15 32 2 58 30 28 3 32 39 35 - 49 0 0 31 48 30 6 51 23 65 129 -40 31 19 13 32 17 52 30 43 3 32 54 26 - 48 0 0 32 3 11 6 51 38 65 131 -39 31 33 56 32 32 31 30 57 49 33 9 2 - 47 0 0 32 17 37 6 51 52 66 133 -38 31 48 25 32 46 55 31 12 20 33 23 24 - 46 0 0 32 31 49 6 52 7 66 135 -37 32 2 39 33 1 5 31 26 37 33 37 31 - 45 0 0 32 45 46 6 52 22 67 138 -36 32 16 38 33 14 59 31 40 38 33 51 22 - 44 0 0 32 59 27 6 52 37 67 140 -35 32 30 21 33 28 38 31 54 24 34 4 59 - 43 0 0 33 12 53 6 52 51 67 143 -34 32 43 49 33 42 2 32 7 54 34 18 19 - 42 0 0 33 26 3 6 53 6 68 146 -34 32 57 1 33 55 10 32 21 9 34 31 25 - 41 0 0 33 38 57 6 53 21 68 148 -33 33 9 58 34 8 2 32 34 8 34 44 14 - 40 0 0 33 51 35 6 53 35 68 151 -32 33 22 38 34 20 38 32 46 51 34 56 47 - 39 0 0 34 3 58 6 53 50 68 154 -31 33 35 2 34 32 58 32 59 18 35 9 5 - 38 0 0 34 16 4 6 54 5 69 157 -30 33 47 11 34 45 2 33 11 29 35 21 6 - 37 0 0 34 27 53 6 54 19 69 160 -29 33 59 2 34 56 50 33 23 24 35 32 51 - 36 0 0 34 39 26 6 54 34 69 163 -29 34 10 38 35 8 21 33 35 1 35 44 19 - 35 0 0 34 50 43 6 54 48 69 165 -28 34 21 56 35 19 35 33 46 23 35 55 31 - 34 0 0 35 1 43 6 55 3 69 168 -27 34 32 58 35 30 33 33 57 27 36 6 26 - 33 0 0 35 12 26 6 55 17 69 171 -26 34 43 43 35 41 14 34 8 15 36 17 5 - 32 0 0 35 22 52 6 55 31 69 174 -25 34 54 12 35 51 38 34 18 45 36 27 27 - 31 0 0 35 33 2 6 55 46 69 177 -24 35 4 23 36 1 46 34 28 59 36 37 32 - 30 0 0 35 42 54 6 56 0 69 180 -24 35 14 17 36 11 36 34 38 56 36 47 20 - 29 0 0 35 52 29 6 56 14 68 183 -23 35 23 54 36 21 10 34 48 35 36 56 51 - 28 0 0 36 1 47 6 56 28 68 186 -22 35 33 14 36 30 26 34 57 57 37 6 5 - 27 0 0 36 10 48 6 56 42 68 188 -21 35 42 17 36 39 25 35 7 2 37 15 1 - 26 0 0 36 19 32 6 56 56 68 191 -20 35 51 2 36 48 7 35 15 50 37 23 41 - 25 0 0 36 27 58 6 57 10 67 193 -20 35 59 31 36 56 31 35 24 20 37 32 4 - 24 0 0 36 36 7 6 57 24 67 196 -19 36 7 41 37 4 39 35 32 33 37 40 9 - 23 0 0 36 43 59 6 57 38 67 198 -18 36 15 35 37 12 29 35 40 28 37 47 57 - 22 0 0 36 51 33 6 57 52 66 201 -17 36 23 11 37 20 2 35 48 6 37 55 28 - 21 0 0 36 58 50 6 58 5 66 203 -16 36 30 29 37 27 17 35 55 26 38 2 41 - 20 0 0 37 5 50 6 58 19 65 205 -16 36 37 30 37 34 15 36 2 29 38 9 37 - 19 0 0 37 12 32 6 58 32 65 208 -15 36 44 13 37 40 56 36 9 14 38 16 16 - 18 0 0 37 18 56 6 58 45 64 210 -14 36 50 39 37 47 19 36 15 42 38 22 38 - 17 0 0 37 25 4 6 58 59 64 212 -13 36 56 48 37 53 25 36 21 52 38 28 42 - 16 0 0 37 30 53 6 59 12 63 214 -13 37 2 38 37 59 13 36 27 44 38 34 28 - 15 0 0 37 36 25 6 59 25 63 216 -12 37 8 12 38 4 44 36 33 19 38 39 58 - 14 0 0 37 41 40 6 59 38 62 217 -11 37 13 27 38 9 57 36 38 36 38 45 10 - 13 0 0 37 46 37 6 59 51 62 219 -10 37 18 26 38 14 53 36 43 35 38 50 5 - 12 0 0 37 51 16 7 0 4 61 221 -10 37 23 6 38 19 32 36 48 17 38 54 42 - 11 0 0 37 55 39 7 0 16 60 223 -9 37 27 29 38 23 53 36 52 41 38 59 2 - 10 0 0 37 59 43 7 0 29 60 224 -8 37 31 35 38 27 57 36 56 48 39 3 5 - 9 0 0 38 3 30 7 0 42 59 226 -7 37 35 22 38 31 43 37 0 37 39 6 50 - 8 0 0 38 7 0 7 0 54 59 227 -7 37 38 53 38 35 12 37 4 8 39 10 18 - 7 0 0 38 10 12 7 1 6 58 229 -6 37 42 6 38 38 24 37 7 22 39 13 29 - 6 0 0 38 13 7 7 1 18 57 230 -5 37 45 1 38 41 18 37 10 18 39 16 22 - 5 0 0 38 15 44 7 1 30 57 232 -4 37 47 39 38 43 55 37 12 56 39 18 58 - 4 0 0 38 18 4 7 1 42 56 233 -4 37 49 59 38 46 14 37 15 17 39 21 17 - 3 0 0 38 20 6 7 1 54 55 234 -3 37 52 2 38 48 16 37 17 20 39 23 19 - 2 0 0 38 21 52 7 2 6 55 236 -2 37 53 47 38 50 1 37 19 6 39 25 3 - 1 0 0 38 23 19 7 2 18 54 237 -2 37 55 15 38 51 28 37 20 34 39 26 30 0 0 0 38 24 30 7 2 29 53 238 -1 37 56 26 38 52 39 37 21 45 39 27 40 1 0 0 38 25 23 7 2 41 52 239 0 37 57 19 38 53 31 37 22 38 39 28 33 Uncertainty in time = +/- 11 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 36823873 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 56 17.4587 DE: +14 19 00.260 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .026 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1015) Christa approx. diameter [km]: 97 approx. diameter ["]: .049 distance from Earth [AU]: 2.72300 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 783 number of rejected observations: 81 time covered by the observations: 1924 Feb 01 - 2007 Nov 29 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.015, 100° remarks: * orbital elements for (1015) Christa : Mean anomaly = 76.17929926 deg Arg. of pericenter = 283.10460541 deg Long. of node = 120.48499921 deg Inclination = 9.46044541 deg Eccentricity = 0.08256561 Semimajor axis = 3.20904959 AU Perihelion dist = 2.94409245 AU Mag: H = 8.93, G = 0.15 Epoch of elements : MJD 55171.28800000 TDT (2009 Dec 06.288) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 6 1015 Christa 6h 55.0m UT 11.7 9 56 17.459 14 19 0.26UCAC2 36823873 0.0 14.6 97 14.2 2.723 0.845 2.15 -29.8863 14.316 73.99 -22.51 6.9174 -0.06087 0.35168 3.80650 0.66466 -0.00539 0.00190 2000 75.958470200912 5.00000283.104605120.484999 9.4604450.08256561 3.2090496 2.9440925 9.0 5.00.15 RATE 1.7145080 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.030 97 1.62 0.031 0 54545.5020091206_823873 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 17:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org