IOTA/IOTA-ES occultation update for (1015) Christa / TYC 6263-01383-1 event on 2012 Oct 06, 09:45 UT Visible from NE Australia Summary ------- On 2012 Oct 06 UT, the 101 km diameter asteroid (1015) Christa will occult a 9.9 mag star in the constellation Sagittarius for observers along a path across NE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 15.2 mag (the magnitude of the asteroid) for at most 4.6 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 72 * date and approx. time of event: 2012 Oct 06, 09:46 - 2012 Oct 06, 09:50 UT * geocentric midpoint of event [JD]: 2456206.906975 * magnitude of target star: 9.9 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 4.6 * Moon: 68 % sunlit, 170° distance * Sun: 78° distance * rough path description: NE Australia The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 0.80 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .032", 1° ) * approx speed of asteroid's shadow [km/s]: 21.7991 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6263-01383-1 by 1015 Christa on 2012 Oct 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 122 0 0 -17 19 20 9 46 59 77 248 0 -17 46 53 -16 51 46 -18 30 56 -16 7 36 123 0 0 -17 22 56 9 47 4 76 250 -1 -17 50 29 -16 55 23 -18 34 30 -16 11 14 124 0 0 -17 26 8 9 47 9 75 251 -2 -17 53 39 -16 58 35 -18 37 39 -16 14 27 125 0 0 -17 28 54 9 47 14 75 252 -3 -17 56 25 -17 1 22 -18 40 25 -16 17 15 126 0 0 -17 31 16 9 47 19 74 253 -4 -17 58 47 -17 3 45 -18 42 45 -16 19 39 127 0 0 -17 33 14 9 47 23 73 254 -5 -18 0 44 -17 5 42 -18 44 42 -16 21 37 128 0 0 -17 34 47 9 47 28 72 254 -6 -18 2 17 -17 7 16 -18 46 14 -16 23 11 129 0 0 -17 35 55 9 47 33 71 255 -7 -18 3 24 -17 8 24 -18 47 21 -16 24 20 130 0 0 -17 36 39 9 47 37 70 255 -8 -18 4 8 -17 9 8 -18 48 4 -16 25 4 131 0 0 -17 36 58 9 47 42 69 255 -9 -18 4 27 -17 9 27 -18 48 23 -16 25 23 132 0 0 -17 36 52 9 47 47 68 256 -10 -18 4 21 -17 9 21 -18 48 18 -16 25 17 133 0 0 -17 36 22 9 47 51 67 256 -11 -18 3 51 -17 8 51 -18 47 48 -16 24 47 134 0 0 -17 35 27 9 47 56 66 256 -12 -18 2 57 -17 7 56 -18 46 53 -16 23 52 135 0 0 -17 34 8 9 48 1 65 256 -13 -18 1 38 -17 6 36 -18 45 35 -16 22 31 136 0 0 -17 32 24 9 48 5 64 257 -14 -17 59 54 -17 4 52 -18 43 52 -16 20 47 137 0 0 -17 30 15 9 48 10 63 257 -14 -17 57 46 -17 2 43 -18 41 45 -16 18 37 138 0 0 -17 27 42 9 48 14 62 257 -15 -17 55 14 -17 0 10 -18 39 13 -16 16 3 139 0 0 -17 24 45 9 48 18 61 257 -16 -17 52 17 -16 57 12 -18 36 17 -16 13 4 140 0 0 -17 21 23 9 48 23 60 257 -17 -17 48 56 -16 53 49 -18 32 57 -16 9 40 141 0 0 -17 17 37 9 48 27 60 257 -18 -17 45 10 -16 50 2 -18 29 13 -16 5 52 142 0 0 -17 13 26 9 48 31 59 257 -19 -17 41 0 -16 45 51 -18 25 4 -16 1 39 143 0 0 -17 8 51 9 48 36 58 257 -20 -17 36 26 -16 41 15 -18 20 31 -15 57 2 144 0 0 -17 3 51 9 48 40 57 257 -21 -17 31 27 -16 36 14 -18 15 34 -15 51 59 145 0 0 -16 58 27 9 48 44 56 256 -22 -17 26 4 -16 30 49 -18 10 13 -15 46 33 146 0 0 -16 52 39 9 48 48 55 256 -23 -17 20 18 -16 25 0 -18 4 28 -15 40 42 147 0 0 -16 46 27 9 48 52 54 256 -24 -17 14 6 -16 18 46 -17 58 19 -15 34 26 148 0 0 -16 39 50 9 48 56 53 256 -25 -17 7 31 -16 12 8 -17 51 46 -15 27 46 149 0 0 -16 32 50 9 49 0 52 256 -26 -17 0 32 -16 5 6 -17 44 48 -15 20 42 150 0 0 -16 25 25 9 49 4 51 256 -27 -16 53 8 -15 57 40 -17 37 27 -15 13 13 151 0 0 -16 17 36 9 49 8 50 256 -28 -16 45 21 -15 49 50 -17 29 42 -15 5 20 152 0 0 -16 9 23 9 49 12 49 256 -29 -16 37 10 -15 41 35 -17 21 34 -14 57 4 153 0 0 -16 0 46 9 49 16 48 255 -30 -16 28 34 -15 32 57 -17 13 1 -14 48 22 154 0 0 -15 51 46 9 49 19 47 255 -31 -16 19 35 -15 23 54 -17 4 5 -14 39 17 155 0 0 -15 42 21 9 49 23 46 255 -32 -16 10 13 -15 14 28 -16 54 45 -14 29 48 156 0 0 -15 32 33 9 49 27 45 255 -33 -16 0 26 -15 4 38 -16 45 2 -14 19 55 157 0 0 -15 22 21 9 49 30 44 255 -34 -15 50 17 -14 54 24 -16 34 55 -14 9 39 158 0 0 -15 11 46 9 49 34 43 255 -35 -15 39 43 -14 43 47 -16 24 24 -13 58 58 159 0 0 -15 0 47 9 49 37 42 254 -36 -15 28 46 -14 32 46 -16 13 31 -13 47 54 160 0 0 -14 49 25 9 49 41 41 254 -37 -15 17 26 -14 21 22 -16 2 14 -13 36 27 161 0 0 -14 37 39 9 49 44 40 254 -38 -15 5 43 -14 9 35 -15 50 34 -13 24 36 162 0 0 -14 25 31 9 49 47 39 254 -39 -14 53 36 -13 57 24 -15 38 31 -13 12 21 163 0 0 -14 12 59 9 49 50 38 254 -40 -14 41 7 -13 44 50 -15 26 5 -12 59 44 164 0 0 -14 0 5 9 49 54 37 253 -41 -14 28 15 -13 31 53 -15 13 16 -12 46 44 165 0 0 -13 46 48 9 49 57 36 253 -42 -14 15 0 -13 18 34 -15 0 5 -12 33 21 166 0 0 -13 33 8 9 50 0 35 253 -43 -14 1 23 -13 4 52 -14 46 31 -12 19 35 167 0 0 -13 19 6 9 50 3 34 253 -44 -13 47 23 -12 50 47 -14 32 35 -12 5 27 168 0 0 -13 4 41 9 50 5 33 253 -45 -13 33 1 -12 36 20 -14 18 17 -11 50 56 169 0 0 -12 49 54 9 50 8 32 252 -46 -13 18 16 -12 21 31 -14 3 37 -11 36 3 170 0 0 -12 34 46 9 50 11 31 252 -47 -13 3 10 -12 6 20 -13 48 34 -11 20 48 171 0 0 -12 19 15 9 50 14 30 252 -48 -12 47 42 -11 50 47 -13 33 10 -11 5 11 172 0 0 -12 3 24 9 50 16 29 252 -49 -12 31 53 -11 34 53 -13 17 25 -10 49 13 173 0 0 -11 47 10 9 50 19 28 252 -50 -12 15 42 -11 18 37 -13 1 18 -10 32 53 174 0 0 -11 30 36 9 50 21 27 252 -51 -11 59 10 -11 2 0 -12 44 51 -10 16 12 175 0 0 -11 13 41 9 50 23 26 251 -52 -11 42 18 -10 45 3 -12 28 2 - 9 59 10 176 0 0 -10 56 25 9 50 26 25 251 -53 -11 25 4 -10 27 44 -12 10 53 - 9 41 48 177 0 0 -10 38 49 9 50 28 24 251 -54 -11 7 30 -10 10 5 -11 53 23 - 9 24 5 178 0 0 -10 20 52 9 50 30 23 251 -55 -10 49 37 - 9 52 6 -11 35 33 - 9 6 2 179 0 0 -10 2 36 9 50 32 22 251 -56 -10 31 23 - 9 33 47 -11 17 23 - 8 47 39 180 0 0 - 9 44 0 9 50 34 21 251 -57 -10 12 49 - 9 15 9 -10 58 54 - 8 28 56 -179 0 0 - 9 25 5 9 50 36 20 250 -58 - 9 53 57 - 8 56 11 -10 40 6 - 8 9 54 -178 0 0 - 9 5 51 9 50 38 19 250 -59 - 9 34 45 - 8 36 55 -10 20 58 - 7 50 34 -177 0 0 - 8 46 18 9 50 39 17 250 -60 - 9 15 15 - 8 17 19 -10 1 32 - 7 30 54 -176 0 0 - 8 26 27 9 50 41 16 250 -61 - 8 55 27 - 7 57 26 - 9 41 47 - 7 10 57 -175 0 0 - 8 6 18 9 50 42 15 250 -62 - 8 35 20 - 7 37 15 - 9 21 45 - 6 50 42 -174 0 0 - 7 45 52 9 50 44 14 250 -63 - 8 14 56 - 7 16 46 - 9 1 25 - 6 30 9 -173 0 0 - 7 25 8 9 50 45 13 250 -64 - 7 54 15 - 6 55 59 - 8 40 47 - 6 9 19 -172 0 0 - 7 4 7 9 50 46 12 249 -65 - 7 33 17 - 6 34 57 - 8 19 53 - 5 48 12 -171 0 0 - 6 42 50 9 50 47 11 249 -66 - 7 12 2 - 6 13 37 - 7 58 42 - 5 26 49 -170 0 0 - 6 21 17 9 50 48 10 249 -67 - 6 50 32 - 5 52 2 - 7 37 15 - 5 5 10 -169 0 0 - 5 59 29 9 50 49 9 249 -69 - 6 28 45 - 5 30 11 - 7 15 33 - 4 43 16 -168 0 0 - 5 37 25 9 50 50 8 249 -70 - 6 6 44 - 5 8 5 - 6 53 35 - 4 21 6 -167 0 0 - 5 15 7 9 50 51 7 249 -71 - 5 44 28 - 4 45 45 - 6 31 22 - 3 58 42 -166 0 0 - 4 52 35 9 50 51 6 249 -72 - 5 21 57 - 4 23 10 - 6 8 55 - 3 36 4 -165 0 0 - 4 29 48 9 50 52 5 249 -73 - 4 59 13 - 4 0 22 - 5 46 14 - 3 13 13 -164 0 0 - 4 6 49 9 50 52 4 249 -74 - 4 36 16 - 3 37 21 - 5 23 20 - 2 50 8 -163 0 0 - 3 43 37 9 50 52 3 249 -75 - 4 13 6 - 3 14 6 - 5 0 13 - 2 26 51 -162 0 0 - 3 20 12 9 50 53 2 249 -76 - 3 49 43 - 2 50 40 - 4 36 54 - 2 3 21 -161 0 0 - 2 56 36 9 50 53 1 249 -77 - 3 26 9 - 2 27 2 - 4 13 22 - 1 39 40 Uncertainty in time = +/- 4 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 6263-01383-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 05 31.4569 DE: -21 29 33.556 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .031 ) * V mag [mag]: 9.9 * B mag [mag]: 10.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1015) Christa approx. diameter [km]: 101 approx. diameter ["]: .041 distance from Earth [AU]: 3.36600 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1091 number of rejected observations: 83 time covered by the observations: 1924 Feb 01 - 2012 Jul 17 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.010, 100° remarks: * orbital elements for (1015) Christa : Mean anomaly = 252.95981846 deg Arg. of pericenter = 283.73729201 deg Long. of node = 120.44632527 deg Inclination = 9.46086906 deg Eccentricity = 0.08314733 Semimajor axis = 3.20805053 AU Perihelion dist = 2.94130969 AU Mag: H = 8.97, G = 0.15 Epoch of elements : MJD 56206.40700000 TDT (2012 Oct 06.407) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 6 1015 Christa 9h 46.0m UT 9.9 18 5 31.457-21 29 33.56TYC 6263-01383-1 10.5 15.2 101 4.6 3.366 2.278 -4.72 109.4091 -21.491 30.50 -5.35 9.7674 0.01778 0.09448 12.17023 -1.80947 0.00573 0.00010 2000 251.8608202012 930.00000283.737292120.446325 9.4608690.08314733 3.2080505 2.9413097 9.0 5.00.15 RATE 1.7153080 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.032 1 1.80 0.033 0 0-1 4 056165.0020121006_1383-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 23:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org