IOTA/IOTA-ES occultation update for (600) Musa / TYC 0770-00876-1 event on 2012 Oct 25, 21:37 UT Visible from China, SW Asia Summary ------- On 2012 Oct 25 UT, the 24 km diameter asteroid (600) Musa will occult a 11.9 mag star in the constellation Gemini for observers along a path across China, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 15.3 mag (the magnitude of the asteroid) for at most 2.9 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 25 * date and approx. time of event: 2012 Oct 25, 21:26 - 2012 Oct 25, 21:39 UT * geocentric midpoint of event [JD]: 2456226.40120833 * magnitude of target star: 11.9 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 2.9 * Moon: 85 % sunlit, 121° distance * Sun: 104° distance * rough path description: China, SW Asia The occultation path -------------------- * approximate projected width [km]: 26 * 1 sigma uncertainty interval [path widths]: +/- 2.71 * 1 sigma uncertainty interval [seconds]: +/- 8.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .037", 89° ) * approx speed of asteroid's shadow [km/s]: 8.4542 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0770-00876-1 by 600 Musa on 2012 Oct 25 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 12 0 0 41 41 17 21 26 12 1 73 -55 41 33 54 41 48 40 .. .. .. 42 28 52 13 0 0 41 54 48 21 26 12 2 74 -55 41 47 26 42 2 11 .. .. .. 42 42 18 14 0 0 42 7 59 21 26 12 2 75 -55 42 0 38 42 15 21 .. .. .. 42 55 24 15 0 0 42 20 51 21 26 13 3 75 -56 42 13 30 42 28 12 .. .. .. 43 8 11 16 0 0 42 33 23 21 26 13 4 76 -56 42 26 3 42 40 43 41 46 25 43 20 37 17 0 0 42 45 35 21 26 14 5 77 -56 42 38 16 42 52 55 41 58 42 43 32 44 18 0 0 42 57 27 21 26 15 5 78 -56 42 50 9 43 4 46 42 10 40 43 44 31 19 0 0 43 9 0 21 26 16 6 78 -57 43 1 42 43 16 18 42 22 17 43 55 59 20 0 0 43 20 12 21 26 18 7 79 -57 43 12 55 43 27 29 42 33 35 44 7 6 21 0 0 43 31 5 21 26 19 8 80 -57 43 23 49 43 38 21 42 44 32 44 17 54 22 0 0 43 41 38 21 26 20 8 80 -57 43 34 22 43 48 53 42 55 10 44 28 22 23 0 0 43 51 51 21 26 22 9 81 -57 43 44 36 43 59 6 43 5 27 44 38 30 24 0 0 44 1 44 21 26 24 10 82 -57 43 54 30 44 8 58 43 15 25 44 48 19 25 0 0 44 11 17 21 26 26 11 82 -57 44 4 4 44 18 31 43 25 3 44 57 48 26 0 0 44 20 31 21 26 28 11 83 -57 44 13 18 44 27 44 43 34 21 45 6 57 27 0 0 44 29 25 21 26 30 12 84 -57 44 22 13 44 36 37 43 43 19 45 15 46 28 0 0 44 37 58 21 26 32 13 85 -57 44 30 47 44 45 10 43 51 57 45 24 16 29 0 0 44 46 13 21 26 35 14 85 -57 44 39 2 44 53 24 44 0 15 45 32 26 30 0 0 44 54 7 21 26 37 14 86 -57 44 46 57 45 1 17 44 8 14 45 40 16 31 0 0 45 1 42 21 26 40 15 87 -57 44 54 32 45 8 51 44 15 52 45 47 47 32 0 0 45 8 57 21 26 42 16 87 -57 45 1 48 45 16 6 44 23 11 45 54 58 33 0 0 45 15 52 21 26 45 16 88 -57 45 8 44 45 23 0 44 30 10 46 1 50 34 0 0 45 22 28 21 26 48 17 89 -57 45 15 20 45 29 35 44 36 49 46 8 22 35 0 0 45 28 43 21 26 51 18 90 -57 45 21 36 45 35 51 44 43 8 46 14 34 36 0 0 45 34 40 21 26 55 19 90 -57 45 27 33 45 41 47 44 49 7 46 20 27 37 0 0 45 40 16 21 26 58 19 91 -57 45 33 10 45 47 23 44 54 47 46 26 1 38 0 0 45 45 33 21 27 1 20 92 -57 45 38 28 45 52 39 45 0 7 46 31 15 39 0 0 45 50 31 21 27 5 21 93 -56 45 43 26 45 57 36 45 5 7 46 36 10 40 0 0 45 55 9 21 27 9 21 93 -56 45 48 4 46 2 14 45 9 48 46 40 45 41 0 0 45 59 27 21 27 12 22 94 -56 45 52 23 46 6 32 45 14 8 46 45 1 42 0 0 46 3 26 21 27 16 23 95 -56 45 56 22 46 10 30 45 18 10 46 48 57 43 0 0 46 7 5 21 27 20 24 96 -56 46 0 1 46 14 9 45 21 51 46 52 34 44 0 0 46 10 25 21 27 24 24 97 -55 46 3 21 46 17 29 45 25 13 46 55 52 45 0 0 46 13 25 21 27 29 25 97 -55 46 6 22 46 20 28 45 28 14 46 58 50 46 0 0 46 16 5 21 27 33 26 98 -55 46 9 3 46 23 9 45 30 57 47 1 29 47 0 0 46 18 27 21 27 37 26 99 -54 46 11 24 46 25 30 45 33 19 47 3 49 48 0 0 46 20 28 21 27 42 27 100 -54 46 13 26 46 27 31 45 35 22 47 5 49 49 0 0 46 22 10 21 27 47 28 101 -54 46 15 8 46 29 13 45 37 5 47 7 30 50 0 0 46 23 32 21 27 51 28 101 -54 46 16 30 46 30 35 45 38 29 47 8 51 51 0 0 46 24 35 21 27 56 29 102 -53 46 17 33 46 31 38 45 39 32 47 9 53 52 0 0 46 25 19 21 28 1 30 103 -53 46 18 17 46 32 21 45 40 16 47 10 36 53 0 0 46 25 42 21 28 6 30 104 -52 46 18 40 46 32 44 45 40 40 47 10 59 54 0 0 46 25 46 21 28 11 31 105 -52 46 18 45 46 32 48 45 40 45 47 11 3 55 0 0 46 25 31 21 28 17 32 106 -52 46 18 29 46 32 33 45 40 29 47 10 47 56 0 0 46 24 55 21 28 22 32 106 -51 46 17 54 46 31 57 45 39 54 47 10 12 57 0 0 46 24 0 21 28 27 33 107 -51 46 16 59 46 31 3 45 38 59 47 9 17 58 0 0 46 22 46 21 28 33 34 108 -50 46 15 44 46 29 48 45 37 44 47 8 3 59 0 0 46 21 11 21 28 39 35 109 -50 46 14 9 46 28 13 45 36 8 47 6 29 60 0 0 46 19 17 21 28 44 35 110 -50 46 12 15 46 26 19 45 34 13 47 4 35 61 0 0 46 17 3 21 28 50 36 111 -49 46 10 0 46 24 5 45 31 58 47 2 22 62 0 0 46 14 29 21 28 56 37 112 -49 46 7 26 46 21 31 45 29 23 46 59 49 63 0 0 46 11 34 21 29 2 37 113 -48 46 4 32 46 18 37 45 26 28 46 56 56 64 0 0 46 8 20 21 29 9 38 114 -48 46 1 18 46 15 24 45 23 12 46 53 43 65 0 0 46 4 46 21 29 15 39 114 -47 45 57 43 46 11 50 45 19 36 46 50 11 66 0 0 46 0 52 21 29 21 39 115 -47 45 53 49 46 7 56 45 15 40 46 46 19 67 0 0 45 56 37 21 29 28 40 116 -46 45 49 34 46 3 41 45 11 24 46 42 6 68 0 0 45 52 3 21 29 35 41 117 -46 45 44 59 45 59 7 45 6 47 46 37 33 69 0 0 45 47 8 21 29 41 41 118 -45 45 40 3 45 54 12 45 1 49 46 32 41 70 0 0 45 41 52 21 29 48 42 119 -45 45 34 47 45 48 57 44 56 31 46 27 28 71 0 0 45 36 16 21 29 55 43 120 -44 45 29 11 45 43 22 44 50 53 46 21 55 72 0 0 45 30 20 21 30 2 43 121 -44 45 23 14 45 37 26 44 44 54 46 16 1 73 0 0 45 24 3 21 30 9 44 122 -43 45 16 57 45 31 9 44 38 33 46 9 47 74 0 0 45 17 25 21 30 17 45 123 -42 45 10 18 45 24 32 44 31 52 46 3 12 75 0 0 45 10 26 21 30 24 45 124 -42 45 3 19 45 17 34 44 24 50 45 56 17 76 0 0 45 3 7 21 30 32 46 125 -41 44 55 59 45 10 15 44 17 27 45 49 1 77 0 0 44 55 26 21 30 39 47 126 -41 44 48 18 45 2 35 44 9 43 45 41 24 78 0 0 44 47 25 21 30 47 47 128 -40 44 40 16 44 54 34 44 1 38 45 33 27 79 0 0 44 39 2 21 30 55 48 129 -40 44 31 53 44 46 12 43 53 12 45 25 8 80 0 0 44 30 18 21 31 3 49 130 -39 44 23 8 44 37 29 43 44 24 45 16 29 81 0 0 44 21 13 21 31 11 49 131 -38 44 14 3 44 28 24 43 35 14 45 7 28 82 0 0 44 11 47 21 31 20 50 132 -38 44 4 35 44 18 59 43 25 43 44 58 6 83 0 0 44 1 59 21 31 28 51 133 -37 43 54 47 44 9 11 43 15 51 44 48 22 84 0 0 43 51 49 21 31 36 51 134 -36 43 44 36 43 59 3 43 5 37 44 38 18 85 0 0 43 41 18 21 31 45 52 136 -36 43 34 5 43 48 32 42 55 1 44 27 51 86 0 0 43 30 25 21 31 54 53 137 -35 43 23 11 43 37 40 42 44 3 44 17 4 87 0 0 43 19 11 21 32 3 53 138 -34 43 11 56 43 26 26 42 32 43 44 5 54 88 0 0 43 7 34 21 32 12 54 140 -34 43 0 18 43 14 51 42 21 2 43 54 23 89 0 0 42 55 36 21 32 21 54 141 -33 42 48 19 43 2 53 42 8 58 43 42 30 90 0 0 42 43 15 21 32 30 55 142 -32 42 35 58 42 50 34 41 56 32 43 30 15 91 0 0 42 30 33 21 32 39 56 144 -32 42 23 14 42 37 52 41 43 44 43 17 38 92 0 0 42 17 28 21 32 49 56 145 -31 42 10 9 42 24 48 41 30 34 43 4 39 93 0 0 42 4 1 21 32 58 57 147 -30 41 56 41 42 11 22 41 17 1 42 51 18 94 0 0 41 50 12 21 33 8 58 148 -30 41 42 51 41 57 34 41 3 6 42 37 35 95 0 0 41 36 1 21 33 18 58 150 -29 41 28 39 41 43 24 40 48 49 42 23 30 96 0 0 41 21 27 21 33 28 59 151 -28 41 14 4 41 28 51 40 34 9 42 9 2 97 0 0 41 6 31 21 33 38 59 153 -27 40 59 7 41 13 56 40 19 7 41 54 12 98 0 0 40 51 13 21 33 48 60 155 -27 40 43 48 40 58 38 40 3 43 41 39 0 99 0 0 40 35 32 21 33 58 60 156 -26 40 28 6 40 42 59 39 47 56 41 23 26 100 0 0 40 19 29 21 34 9 61 158 -25 40 12 2 40 26 57 39 31 47 41 7 29 101 0 0 40 3 4 21 34 19 62 160 -24 39 55 36 40 10 32 39 15 15 40 51 10 102 0 0 39 46 16 21 34 30 62 162 -24 39 38 47 39 53 45 38 58 21 40 34 28 103 0 0 39 29 6 21 34 41 63 164 -23 39 21 36 39 36 36 38 41 5 40 17 25 104 0 0 39 11 34 21 34 52 63 166 -22 39 4 3 39 19 5 38 23 26 39 59 59 105 0 0 38 53 39 21 35 3 64 168 -21 38 46 7 39 1 11 38 5 25 39 42 11 106 0 0 38 35 22 21 35 14 64 170 -20 38 27 50 38 42 56 37 47 2 39 24 0 107 0 0 38 16 44 21 35 25 64 173 -19 38 9 10 38 24 18 37 28 17 39 5 28 108 0 0 37 57 43 21 35 37 65 175 -19 37 50 8 38 5 19 37 9 10 38 46 34 109 0 0 37 38 21 21 35 48 65 177 -18 37 30 45 37 45 57 36 49 42 38 27 18 110 0 0 37 18 37 21 36 0 66 180 -17 37 11 0 37 26 14 36 29 52 38 7 41 111 0 0 36 58 32 21 36 12 66 182 -16 36 50 54 37 6 10 36 9 40 37 47 42 112 0 0 36 38 5 21 36 24 66 185 -15 36 30 26 36 45 44 35 49 7 37 27 21 113 0 0 36 17 17 21 36 36 66 188 -14 36 9 38 36 24 57 35 28 14 37 6 39 114 0 0 35 56 9 21 36 48 67 190 -14 35 48 28 36 3 50 35 6 59 36 45 37 115 0 0 35 34 39 21 37 0 67 193 -13 35 26 58 35 42 21 34 45 24 36 24 14 116 0 0 35 12 50 21 37 12 67 196 -12 35 5 7 35 20 33 34 23 28 36 2 30 117 0 0 34 50 40 21 37 24 67 199 -11 34 42 57 34 58 24 34 1 13 35 40 26 118 0 0 34 28 11 21 37 37 67 201 -10 34 20 26 34 35 55 33 38 38 35 18 2 119 0 0 34 5 22 21 37 49 67 204 -9 33 57 37 34 13 7 33 15 44 34 55 19 120 0 0 33 42 14 21 38 2 67 207 -8 33 34 28 33 50 0 32 52 31 34 32 16 121 0 0 33 18 47 21 38 14 67 210 -7 33 11 0 33 26 34 32 28 59 34 8 55 122 0 0 32 55 2 21 38 27 67 213 -6 32 47 15 33 2 50 32 5 9 33 45 15 123 0 0 32 31 0 21 38 40 67 216 -5 32 23 11 32 38 48 31 41 2 33 21 17 124 0 0 32 6 40 21 38 53 67 218 -4 31 58 51 32 14 29 31 16 37 32 57 2 125 0 0 31 42 3 21 39 6 66 221 -3 31 34 13 31 49 53 30 51 56 32 32 29 126 0 0 31 17 9 21 39 19 66 224 -2 31 9 19 31 25 0 30 26 58 32 7 40 127 0 0 30 52 0 21 39 32 66 227 -1 30 44 9 30 59 52 30 1 45 31 42 35 128 0 0 30 26 36 21 39 45 65 229 0 30 18 44 30 34 28 29 36 17 31 17 15 Uncertainty in time = +/- 9 secs Prediction of 2012 Jul 10.0 Data for the target star ------------------------ * name: TYC 0770-00876-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 14 21.1266 DE: +12 52 46.362 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .035, .035 ) * V mag [mag]: 11.9 * B mag [mag]: 12.4 * Apparent position with proper motion RA(deg): 108.7729818466 DE(deg): 12.8556951818 * Equation of equinoxes (radians) : 0.000059571256217 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (600) Musa approx. diameter [km]: 24 approx. diameter ["]: .014 distance from Earth [AU]: 2.38800 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1116 number of rejected observations: 80 time covered by the observations: 1919 Jun 22 - 2012 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.014, 87° remarks: * orbital elements for (600) Musa : Mean anomaly = 195.97965665 deg Arg. of pericenter = 113.90616286 deg Long. of node = 139.32679743 deg Inclination = 10.19333437 deg Eccentricity = 0.05440587 Semimajor axis = 2.66145978 AU Perihelion dist = 2.51666076 AU Mag: H = 9.95, G = 0.15 Epoch of elements : MJD 56225.90100000 TDT (2012 Oct 25.901) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 25 600 Musa 21h 37.7m UT 11.9 7 14 21.127 12 52 46.36TYC 0770-00876-1 12.4 15.3 24 2.9 2.388 1.130 -5.97 109.4776 12.882 -148.43 -12.47 21.6290 0.12878 0.36352 4.48810 -1.62082 -0.00554 0.00095 2000 194.64013520121020.00000113.906163139.326797 10.1933340.05440587 2.6614598 2.516660710.2 5.00.15 RATE 2.2699910 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.037 89 3.71 0.038 0 0-4 2 056118.0020121025_0876-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 03, 19:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org