IOTA/IOTA-ES occultation update for (20) Massalia / TYC 0267-01093-1 event on 2007 Aug 02, 12:45 UT Visible from Indonesia Summary ------- On 2007 Aug 02 UT, the 146 km diameter asteroid (20) Massalia will occult a 10.9 mag star in the constellation Leo for observers along a path across Indonesia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 11.5 mag (the magnitude of the asteroid) for at most 3.5 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: 99 * date and approx. time of event: 2007 Aug 02, 12:43 - 2007 Aug 02, 12:48 UT * midpoint of event [JD]: 2454315.03178333 * magnitude of target star: 10.9 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 3.5 * Moon: 85 % sunlit, 176° distance * Sun: 41° distance * rough path description: Indonesia The occultation path -------------------- * approximate projected width [km]: 154 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .022", 92° ) * approx speed of asteroid's shadow [km/s]: 41.8851 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0267-01093-1 by 20 Massalia on 2007 Aug 02 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 - 63 0 0 41 27 29 12 43 22 0 85 39 40 45 47 42 9 22 40 18 20 42 37 6 - 62 0 0 41 30 56 12 43 22 1 86 39 40 49 15 42 12 47 40 21 49 42 40 30 - 61 0 0 41 34 3 12 43 22 2 87 40 40 52 23 42 15 53 40 24 59 42 43 35 - 60 0 0 41 36 51 12 43 22 2 87 41 40 55 12 42 18 40 40 27 49 42 46 21 - 59 0 0 41 39 19 12 43 22 3 88 41 40 57 42 42 21 7 40 30 19 42 48 48 - 58 0 0 41 41 28 12 43 22 4 89 42 40 59 52 42 23 15 40 32 29 42 50 55 - 57 0 0 41 43 18 12 43 23 5 89 43 41 1 42 42 25 3 40 34 20 42 52 43 - 56 0 0 41 44 47 12 43 23 5 90 44 41 3 12 42 26 33 40 35 51 42 54 12 - 55 0 0 41 45 58 12 43 23 6 91 44 41 4 23 42 27 42 40 37 2 42 55 21 - 54 0 0 41 46 49 12 43 23 7 91 45 41 5 14 42 28 33 40 37 53 42 56 11 - 53 0 0 41 47 20 12 43 23 8 92 46 41 5 46 42 29 4 40 38 25 42 56 42 - 52 0 0 41 47 32 12 43 24 8 93 46 41 5 58 42 29 16 40 38 38 42 56 54 - 51 0 0 41 47 25 12 43 24 9 93 47 41 5 51 42 29 8 40 38 30 42 56 47 - 50 0 0 41 46 58 12 43 24 10 94 48 41 5 24 42 28 42 40 38 3 42 56 20 - 49 0 0 41 46 11 12 43 25 11 95 49 41 4 37 42 27 55 40 37 16 42 55 34 - 48 0 0 41 45 5 12 43 25 11 95 49 41 3 30 42 26 50 40 36 9 42 54 29 - 47 0 0 41 43 40 12 43 26 12 96 50 41 2 4 42 25 25 40 34 43 42 53 4 - 46 0 0 41 41 54 12 43 26 13 97 51 41 0 19 42 23 40 40 32 57 42 51 20 - 45 0 0 41 39 50 12 43 27 14 97 51 40 58 13 42 21 36 40 30 51 42 49 17 - 44 0 0 41 37 26 12 43 27 14 98 52 40 55 48 42 19 13 40 28 25 42 46 54 - 43 0 0 41 34 42 12 43 28 15 99 53 40 53 3 42 16 30 40 25 39 42 44 12 - 42 0 0 41 31 38 12 43 28 16 100 53 40 49 58 42 13 28 40 22 34 42 41 10 - 41 0 0 41 28 15 12 43 29 17 100 54 40 46 34 42 10 6 40 19 9 42 37 50 - 40 0 0 41 24 32 12 43 29 17 101 55 40 42 50 42 6 25 40 15 23 42 34 9 - 39 0 0 41 20 30 12 43 30 18 102 55 40 38 46 42 2 24 40 11 18 42 30 9 - 38 0 0 41 16 8 12 43 31 19 102 56 40 34 22 41 58 4 40 6 53 42 25 50 - 37 0 0 41 11 26 12 43 31 20 103 57 40 29 38 41 53 24 40 2 8 42 21 11 - 36 0 0 41 6 24 12 43 32 20 104 57 40 24 34 41 48 24 39 57 3 42 16 13 - 35 0 0 41 1 2 12 43 33 21 104 58 40 19 11 41 43 4 39 51 38 42 10 55 - 34 0 0 40 55 21 12 43 34 22 105 59 40 13 27 41 37 25 39 45 53 42 5 17 - 33 0 0 40 49 20 12 43 34 23 106 59 40 7 23 41 31 26 39 39 48 41 59 19 - 32 0 0 40 42 58 12 43 35 23 106 60 40 1 0 41 25 7 39 33 23 41 53 2 - 31 0 0 40 36 17 12 43 36 24 107 61 39 54 16 41 18 29 39 26 37 41 46 25 - 30 0 0 40 29 16 12 43 37 25 108 61 39 47 12 41 11 30 39 19 32 41 39 28 - 29 0 0 40 21 55 12 43 38 26 109 62 39 39 48 41 4 11 39 12 6 41 32 12 - 28 0 0 40 14 13 12 43 39 26 109 62 39 32 4 40 56 33 39 4 20 41 24 35 - 27 0 0 40 6 12 12 43 40 27 110 63 39 23 59 40 48 35 38 56 13 41 16 39 - 26 0 0 39 57 50 12 43 41 28 111 64 39 15 34 40 40 16 38 47 47 41 8 22 - 25 0 0 39 49 8 12 43 42 29 111 64 39 6 49 40 31 37 38 38 59 40 59 46 - 24 0 0 39 40 6 12 43 43 30 112 65 38 57 44 40 22 39 38 29 52 40 50 49 - 23 0 0 39 30 44 12 43 44 30 113 65 38 48 18 40 13 20 38 20 24 40 41 33 - 22 0 0 39 21 1 12 43 45 31 114 66 38 38 32 40 3 41 38 10 36 40 31 56 - 21 0 0 39 10 58 12 43 46 32 114 66 38 28 26 39 53 41 38 0 27 40 21 59 - 20 0 0 39 0 35 12 43 48 33 115 67 38 17 59 39 43 22 37 49 58 40 11 42 - 19 0 0 38 49 52 12 43 49 33 116 67 38 7 12 39 32 42 37 39 8 40 1 5 - 18 0 0 38 38 48 12 43 50 34 117 68 37 56 4 39 21 42 37 27 58 39 50 7 - 17 0 0 38 27 23 12 43 51 35 117 68 37 44 36 39 10 22 37 16 27 39 38 50 - 16 0 0 38 15 39 12 43 53 36 118 69 37 32 47 38 58 41 37 4 36 39 27 12 - 15 0 0 38 3 34 12 43 54 37 119 69 37 20 38 38 46 40 36 52 24 39 15 13 - 14 0 0 37 51 8 12 43 55 37 120 70 37 8 9 38 34 19 36 39 52 39 2 55 - 13 0 0 37 38 22 12 43 57 38 120 70 36 55 18 38 21 37 36 26 59 38 50 16 - 12 0 0 37 25 16 12 43 58 39 121 70 36 42 8 38 8 35 36 13 46 38 37 17 - 11 0 0 37 11 49 12 44 0 40 122 71 36 28 37 37 55 12 36 0 12 38 23 57 - 10 0 0 36 58 2 12 44 1 41 123 71 36 14 45 37 41 30 35 46 18 38 10 17 - 9 0 0 36 43 55 12 44 3 41 124 71 36 0 34 37 27 27 35 32 3 37 56 17 - 8 0 0 36 29 27 12 44 4 42 124 71 35 46 2 37 13 3 35 17 28 37 41 57 - 7 0 0 36 14 39 12 44 6 43 125 71 35 31 9 36 58 20 35 2 33 37 27 16 - 6 0 0 35 59 30 12 44 8 44 126 72 35 15 56 36 43 16 34 47 17 37 12 15 - 5 0 0 35 44 2 12 44 9 45 127 72 35 0 23 36 27 52 34 31 41 36 56 54 - 4 0 0 35 28 13 12 44 11 45 128 72 34 44 30 36 12 8 34 15 45 36 41 13 - 3 0 0 35 12 5 12 44 13 46 129 72 34 28 17 35 56 4 33 59 29 36 25 12 - 2 0 0 34 55 36 12 44 15 47 130 72 34 11 44 35 39 40 33 42 53 36 8 51 - 1 0 0 34 38 48 12 44 16 48 131 71 33 54 51 35 22 56 33 25 57 35 52 11 0 0 0 34 21 40 12 44 18 49 131 71 33 37 39 35 5 53 33 8 42 35 35 10 1 0 0 34 4 12 12 44 20 49 132 71 33 20 6 34 48 29 32 51 7 35 17 50 2 0 0 33 46 25 12 44 22 50 133 71 33 2 15 34 30 47 32 33 12 35 0 10 3 0 0 33 28 18 12 44 24 51 134 71 32 44 4 34 12 44 32 14 58 34 42 11 4 0 0 33 9 52 12 44 26 52 135 70 32 25 33 33 54 23 31 56 25 34 23 53 5 0 0 32 51 7 12 44 28 53 136 70 32 6 44 33 35 43 31 37 33 34 5 15 6 0 0 32 32 3 12 44 30 54 138 70 31 47 36 33 16 43 31 18 22 33 46 19 7 0 0 32 12 41 12 44 32 54 139 69 31 28 9 32 57 25 30 58 52 33 27 4 8 0 0 31 53 0 12 44 34 55 140 69 31 8 24 32 37 49 30 39 4 33 7 30 9 0 0 31 33 1 12 44 36 56 141 68 30 48 21 32 17 54 30 18 58 32 47 38 10 0 0 31 12 44 12 44 38 57 142 68 30 28 0 31 57 41 29 58 34 32 27 28 11 0 0 30 52 9 12 44 41 58 144 67 30 7 21 31 37 10 29 37 53 32 7 0 12 0 0 30 31 17 12 44 43 58 145 67 29 46 24 31 16 22 29 16 54 31 46 14 13 0 0 30 10 7 12 44 45 59 146 66 29 25 11 30 55 16 28 55 38 31 25 11 14 0 0 29 48 41 12 44 47 60 148 65 29 3 41 30 33 53 28 34 5 31 3 51 15 0 0 29 26 58 12 44 50 61 149 65 28 41 54 30 12 14 28 12 16 30 42 14 16 0 0 29 4 59 12 44 52 61 151 64 28 19 51 29 50 19 27 50 11 30 20 21 17 0 0 28 42 44 12 44 54 62 152 63 27 57 33 29 28 7 27 27 50 29 58 12 18 0 0 28 20 13 12 44 57 63 154 62 27 34 59 29 5 40 27 5 14 29 35 47 19 0 0 27 57 27 12 44 59 64 156 62 27 12 10 28 42 57 26 42 23 29 13 7 20 0 0 27 34 27 12 45 2 64 158 61 26 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21 25 19 12 45 41 71 198 48 20 39 30 22 11 22 20 9 23 22 41 53 36 0 0 20 59 32 12 45 44 71 201 47 20 13 42 21 45 35 19 43 34 22 16 6 37 0 0 20 33 38 12 45 47 71 205 46 19 47 48 21 19 42 19 17 40 21 50 13 38 0 0 20 7 40 12 45 49 71 208 45 19 21 50 20 53 44 18 51 42 21 24 16 39 0 0 19 41 38 12 45 52 71 212 44 18 55 48 20 27 42 18 25 40 20 58 14 40 0 0 19 15 33 12 45 55 71 215 43 18 29 43 20 1 36 17 59 35 20 32 8 41 0 0 18 49 25 12 45 58 71 218 42 18 3 35 19 35 28 17 33 28 20 5 59 42 0 0 18 23 15 12 46 0 71 222 41 17 37 26 19 9 17 17 7 18 19 39 48 43 0 0 17 57 3 12 46 3 70 225 40 17 11 15 18 43 5 16 41 8 19 13 35 44 0 0 17 30 51 12 46 6 70 228 39 16 45 3 18 16 52 16 14 57 18 47 21 45 0 0 17 4 39 12 46 9 69 231 38 16 18 52 17 50 38 15 48 47 18 21 7 46 0 0 16 38 27 12 46 12 69 233 37 15 52 42 17 24 26 15 22 38 17 54 54 47 0 0 16 12 17 12 46 14 68 236 36 15 26 34 16 58 14 14 56 30 17 28 41 48 0 0 15 46 9 12 46 17 68 239 35 15 0 28 16 32 5 14 30 25 17 2 31 49 0 0 15 20 5 12 46 20 67 241 34 14 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47 12 80 0 0 3 14 29 12 47 34 39 272 1 2 30 40 3 58 29 2 1 52 4 27 38 81 0 0 2 55 23 12 47 36 38 272 0 2 11 39 3 39 18 1 42 54 4 8 24 82 0 0 2 36 38 12 47 38 37 272 -1 1 52 58 3 20 29 1 24 16 3 49 32 83 0 0 2 18 14 12 47 40 36 273 -2 1 34 39 3 2 1 1 6 0 3 31 1 84 0 0 2 0 12 12 47 41 35 273 -4 1 16 42 2 43 54 0 48 5 3 12 52 85 0 0 1 42 32 12 47 43 34 273 -5 0 59 6 2 26 10 0 30 32 2 55 4 86 0 0 1 25 14 12 47 45 33 273 -6 0 41 53 2 8 48 0 13 21 2 37 39 87 0 0 1 8 19 12 47 46 32 273 -7 0 25 1 1 51 48 - 0 3 27 2 20 37 88 0 0 0 51 46 12 47 48 31 274 -8 0 8 33 1 35 11 - 0 19 53 2 3 57 89 0 0 0 35 37 12 47 49 30 274 -9 - 0 7 33 1 18 57 - 0 35 56 1 47 40 90 0 0 0 19 50 12 47 51 29 274 -10 - 0 23 15 1 3 7 - 0 51 35 1 31 47 91 0 0 0 4 27 12 47 52 28 274 -11 - 0 38 34 0 47 39 - 1 6 52 1 16 17 92 0 0 - 0 10 33 12 47 53 27 274 -12 - 0 53 30 0 32 36 - 1 21 45 1 1 11 93 0 0 - 0 25 8 12 47 55 26 274 -13 - 1 8 2 0 17 56 - 1 36 14 0 46 28 94 0 0 - 0 39 20 12 47 56 25 274 -14 - 1 22 10 0 3 40 - 1 50 20 0 32 10 95 0 0 - 0 53 8 12 47 57 24 274 -15 - 1 35 54 - 0 10 11 - 2 4 1 0 18 16 96 0 0 - 1 6 31 12 47 58 23 274 -16 - 1 49 13 - 0 23 38 - 2 17 19 0 4 46 97 0 0 - 1 19 30 12 47 59 22 274 -17 - 2 2 9 - 0 36 41 - 2 30 12 - 0 8 19 98 0 0 - 1 32 5 12 48 0 21 274 -18 - 2 14 40 - 0 49 19 - 2 42 40 - 0 20 59 99 0 0 - 1 44 15 12 48 1 20 274 -19 - 2 26 46 - 1 1 32 - 2 54 44 - 0 33 15 100 0 0 - 1 55 59 12 48 2 19 274 -20 - 2 38 28 - 1 13 20 - 3 6 24 - 0 45 5 101 0 0 - 2 7 19 12 48 3 18 274 -21 - 2 49 44 - 1 24 44 - 3 17 38 - 0 56 31 102 0 0 - 2 18 14 12 48 4 17 274 -22 - 3 0 36 - 1 35 42 - 3 28 28 - 1 7 31 103 0 0 - 2 28 44 12 48 5 16 274 -23 - 3 11 3 - 1 46 14 - 3 38 53 - 1 18 6 104 0 0 - 2 38 48 12 48 5 15 274 -24 - 3 21 4 - 1 56 22 - 3 48 52 - 1 28 15 105 0 0 - 2 48 28 12 48 6 14 274 -25 - 3 30 41 - 2 6 4 - 3 58 27 - 1 37 59 106 0 0 - 2 57 41 12 48 7 13 274 -26 - 3 39 51 - 2 15 20 - 4 7 36 - 1 47 17 107 0 0 - 3 6 29 12 48 7 11 274 -27 - 3 48 37 - 2 24 11 - 4 16 20 - 1 56 10 108 0 0 - 3 14 52 12 48 8 10 274 -28 - 3 56 57 - 2 32 36 - 4 24 38 - 2 4 37 109 0 0 - 3 22 49 12 48 8 9 274 -29 - 4 4 52 - 2 40 36 - 4 32 31 - 2 12 38 110 0 0 - 3 30 21 12 48 9 8 274 -30 - 4 12 21 - 2 48 10 - 4 39 59 - 2 20 13 111 0 0 - 3 37 26 12 48 9 7 274 -31 - 4 19 25 - 2 55 17 - 4 47 1 - 2 27 22 112 0 0 - 3 44 6 12 48 10 6 274 -32 - 4 26 2 - 3 1 59 - 4 53 38 - 2 34 6 113 0 0 - 3 50 20 12 48 10 5 274 -33 - 4 32 15 - 3 8 15 - 4 59 49 - 2 40 23 114 0 0 - 3 56 8 12 48 10 4 274 -34 - 4 38 1 - 3 14 5 - 5 5 34 - 2 46 14 115 0 0 - 4 1 31 12 48 10 3 274 -35 - 4 43 22 - 3 19 29 - 5 10 54 - 2 51 39 116 0 0 - 4 6 27 12 48 10 2 274 -36 - 4 48 17 - 3 24 28 - 5 15 48 - 2 56 39 117 0 0 - 4 10 58 12 48 10 1 274 -37 - 4 52 46 - 3 29 0 - 5 20 16 - 3 1 11 118 0 0 - 4 15 3 12 48 11 0 274 -38 - 4 56 49 - 3 33 6 .. .. .. - 3 5 18 Data for the target star ------------------------ * name: TYC 0267-01093-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 25 34.7082 DE: +03 30 51.997 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .021 ) * V mag [mag]: 10.9 * B mag [mag]: 11.7 * Apparent position with proper motion RA(deg): 171.4902768711 DE(deg): 3.4738972035 * Equation of equinoxes (radians) : 0.000032922283205 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (20) Massalia approx. diameter [km]: 146 approx. diameter ["]: .067 distance from Earth [AU]: 3.00200 * orbital information: orbit source: Preston date of fit: 2007 Jul 01 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1357 number of rejected observations: 252 time covered by the observations: 1900 Jul 17 - 2007 May 21 1 sigma uncertainty ellipse (major, minor, PA): 0.007, 0.005, 112° remarks: * orbital elements for (20) Massalia : Mean anomaly = 69.19843437 deg Arg. of pericenter = 255.47795704 deg Long. of node = 206.50736365 deg Inclination = 0.70694256 deg Eccentricity = 0.14270091 Semimajor axis = 2.40865814 AU Perihelion dist = 2.06494042 AU Mag: H = 6.45, G = 0.25 Epoch of elements : MJD 54314.53200000 TDT (2007 Aug 02.532) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 02 20 Massalia 12h 45.8m UT 10.9 11 25 34.708 3 30 52.00TYC 0267-01093-1 11.8 11.5 146 3.5 3.002 4.265 -26.83 29.218 3.522 -9.87 17.78 12.7628 .12256 .29326 21.79531 -9.15789 0.00323 -0.00140 2000 68.00353482007 729.00000255.477957206.507364 0.7069430.142700912.408658142.064940426.505 0.25 RATE 2.6365823 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.022 0.022 92.1 1.330 0.022 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 09, 00:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org