IOTA/IOTA-ES occultation update for (1624) Rabe / TYC 0833-01227-1 event on 2012 Oct 22, 13:16 UT Visible from SW Canada Summary ------- On 2012 Oct 22 UT, the 24 km diameter asteroid (1624) Rabe will occult a 10.4 mag star in the constellation Leo for observers along a path across SW Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 17.0 mag (the magnitude of the asteroid) for at most 0.7 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: 22 * date and approx. time of event: 2012 Oct 22, 13:14 - 2012 Oct 22, 13:15 UT * geocentric midpoint of event [JD]: 2456223.05344167 * magnitude of target star: 10.4 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 0.7 * Moon: 55 % sunlit, 156° distance * Sun: 61° distance * rough path description: SW Canada The occultation path -------------------- * approximate projected width [km]: 27 * 1 sigma uncertainty interval [path widths]: +/- 3.00 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .030", 102° ) * approx speed of asteroid's shadow [km/s]: 31.6251 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0833-01227-1 by 1624 Rabe on 2012 Oct 22 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 179 0 0 46 44 10 13 14 1 1 73 -50 46 36 26 46 51 55 .. .. .. 47 38 34 180 0 0 46 56 42 13 14 1 1 74 -50 46 48 59 47 4 26 .. .. .. 47 51 0 -179 0 0 47 8 56 13 14 1 2 75 -49 47 1 14 47 16 39 .. .. .. 48 3 8 -178 0 0 47 20 51 13 14 1 3 75 -49 47 13 9 47 28 33 .. .. .. 48 14 57 -177 0 0 47 32 27 13 14 1 3 76 -48 47 24 46 47 40 8 .. .. .. 48 26 27 -176 0 0 47 43 44 13 14 1 4 77 -47 47 36 4 47 51 24 .. .. .. 48 37 38 -175 0 0 47 54 43 13 14 1 5 78 -47 47 47 4 48 2 22 47 1 22 48 48 31 -174 0 0 48 5 23 13 14 2 6 78 -46 47 57 45 48 13 2 47 12 8 48 59 6 -173 0 0 48 15 45 13 14 2 6 79 -46 48 8 7 48 23 22 47 22 35 49 9 22 -172 0 0 48 25 48 13 14 2 7 80 -45 48 18 11 48 33 25 47 32 43 49 19 19 -171 0 0 48 35 32 13 14 3 8 81 -45 48 27 56 48 43 8 47 42 33 49 28 58 -170 0 0 48 44 58 13 14 3 8 81 -44 48 37 23 48 52 34 47 52 4 49 38 19 -169 0 0 48 54 6 13 14 3 9 82 -43 48 46 31 49 1 41 48 1 17 49 47 22 -168 0 0 49 2 55 13 14 4 10 83 -43 48 55 21 49 10 29 48 10 11 49 56 6 -167 0 0 49 11 26 13 14 4 10 84 -42 49 3 53 49 19 0 48 18 47 50 4 32 -166 0 0 49 19 39 13 14 5 11 84 -42 49 12 7 49 27 12 48 27 4 50 12 40 -165 0 0 49 27 33 13 14 5 12 85 -41 49 20 2 49 35 5 48 35 3 50 20 30 -164 0 0 49 35 10 13 14 6 12 86 -40 49 27 39 49 42 41 48 42 44 50 28 2 -163 0 0 49 42 28 13 14 6 13 87 -40 49 34 58 49 49 59 48 50 7 50 35 16 -162 0 0 49 49 28 13 14 7 14 88 -39 49 41 58 49 56 58 48 57 11 50 42 12 -161 0 0 49 56 10 13 14 8 14 88 -39 49 48 41 50 3 40 49 3 57 50 48 50 -160 0 0 50 2 35 13 14 8 15 89 -38 49 55 6 50 10 4 49 10 25 50 55 10 -159 0 0 50 8 41 13 14 9 15 90 -37 50 1 13 50 16 10 49 16 35 51 1 13 -158 0 0 50 14 29 13 14 10 16 91 -37 50 7 2 50 21 58 49 22 27 51 6 57 -157 0 0 50 20 0 13 14 10 17 92 -36 50 12 33 50 27 28 49 28 1 51 12 25 -156 0 0 50 25 13 13 14 11 17 92 -36 50 17 46 50 32 40 49 33 17 51 17 34 -155 0 0 50 30 8 13 14 12 18 93 -35 50 22 42 50 37 35 49 38 16 51 22 26 -154 0 0 50 34 46 13 14 13 19 94 -34 50 27 20 50 42 12 49 42 56 51 27 1 -153 0 0 50 39 5 13 14 14 19 95 -34 50 31 40 50 46 31 49 47 19 51 31 18 -152 0 0 50 43 8 13 14 15 20 96 -33 50 35 43 50 50 33 49 51 23 51 35 17 -151 0 0 50 46 52 13 14 15 21 96 -33 50 39 28 50 54 17 49 55 10 51 39 0 -150 0 0 50 50 19 13 14 16 21 97 -32 50 42 55 50 57 44 49 58 40 51 42 24 -149 0 0 50 53 29 13 14 17 22 98 -31 50 46 5 51 0 54 50 1 51 51 45 32 -148 0 0 50 56 21 13 14 18 22 99 -31 50 48 57 51 3 45 50 4 45 51 48 22 -147 0 0 50 58 56 13 14 19 23 100 -30 50 51 32 51 6 20 50 7 22 51 50 55 -146 0 0 51 1 13 13 14 20 24 101 -30 50 53 50 51 8 37 50 9 40 51 53 11 -145 0 0 51 3 13 13 14 21 24 101 -29 50 55 50 51 10 36 50 11 42 51 55 9 -144 0 0 51 4 55 13 14 22 25 102 -28 50 57 32 51 12 19 50 13 25 51 56 50 -143 0 0 51 6 20 13 14 23 26 103 -28 50 58 57 51 13 43 50 14 51 51 58 14 -142 0 0 51 7 28 13 14 25 26 104 -27 51 0 5 51 14 51 50 15 59 51 59 21 -141 0 0 51 8 18 13 14 26 27 105 -27 51 0 55 51 15 41 50 16 50 52 0 10 -140 0 0 51 8 51 13 14 27 27 106 -26 51 1 28 51 16 14 50 17 24 52 0 43 -139 0 0 51 9 6 13 14 28 28 107 -25 51 1 44 51 16 29 50 17 39 52 0 58 -138 0 0 51 9 4 13 14 29 29 107 -25 51 1 42 51 16 27 50 17 38 52 0 56 -137 0 0 51 8 45 13 14 30 29 108 -24 51 1 23 51 16 8 50 17 18 52 0 37 -136 0 0 51 8 8 13 14 32 30 109 -23 51 0 46 51 15 31 50 16 41 52 0 1 -135 0 0 51 7 14 13 14 33 30 110 -23 50 59 52 51 14 37 50 15 47 51 59 7 -134 0 0 51 6 3 13 14 34 31 111 -22 50 58 40 51 13 26 50 14 35 51 57 56 -133 0 0 51 4 34 13 14 36 32 112 -22 50 57 11 51 11 57 50 13 5 51 56 28 -132 0 0 51 2 48 13 14 37 32 113 -21 50 55 25 51 10 11 50 11 17 51 54 43 -131 0 0 51 0 44 13 14 38 33 114 -20 50 53 21 51 8 8 50 9 12 51 52 40 -130 0 0 50 58 23 13 14 40 33 115 -20 50 50 59 51 5 46 50 6 50 51 50 21 -129 0 0 50 55 44 13 14 41 34 116 -19 50 48 20 51 3 8 50 4 9 51 47 43 -128 0 0 50 52 47 13 14 42 35 117 -18 50 45 23 51 0 12 50 1 11 51 44 49 -127 0 0 50 49 33 13 14 44 35 118 -18 50 42 9 50 56 58 49 57 55 51 41 37 -126 0 0 50 46 2 13 14 45 36 118 -17 50 38 37 50 53 26 49 54 21 51 38 7 -125 0 0 50 42 12 13 14 47 36 119 -17 50 34 47 50 49 37 49 50 30 51 34 20 -124 0 0 50 38 5 13 14 48 37 120 -16 50 30 40 50 45 31 49 46 20 51 30 16 -123 0 0 50 33 40 13 14 50 37 121 -15 50 26 15 50 41 6 49 41 53 51 25 53 -122 0 0 50 28 58 13 14 52 38 122 -15 50 21 32 50 36 24 49 37 7 51 21 14 -121 0 0 50 23 57 13 14 53 39 123 -14 50 16 31 50 31 24 49 32 4 51 16 16 -120 0 0 50 18 39 13 14 55 39 124 -13 50 11 12 50 26 6 49 26 42 51 11 1 -119 0 0 50 13 2 13 14 57 40 125 -13 50 5 35 50 20 30 49 21 2 51 5 28 -118 0 0 50 7 8 13 14 58 40 126 -12 49 59 40 50 14 36 49 15 4 50 59 37 -117 0 0 50 0 55 13 15 0 41 127 -11 49 53 27 50 8 24 49 8 48 50 53 28 -116 0 0 49 54 24 13 15 2 42 128 -11 49 46 55 50 1 54 49 2 13 50 47 1 -115 0 0 49 47 35 13 15 3 42 130 -10 49 40 6 49 55 5 48 55 20 50 40 16 -114 0 0 49 40 28 13 15 5 43 131 -9 49 32 58 49 47 58 48 48 9 50 33 13 -113 0 0 49 33 2 13 15 7 43 132 -9 49 25 32 49 40 33 48 40 39 50 25 52 -112 0 0 49 25 18 13 15 9 44 133 -8 49 17 47 49 32 50 48 32 51 50 18 12 -111 0 0 49 17 16 13 15 11 44 134 -7 49 9 44 49 24 48 48 24 44 50 10 14 -110 0 0 49 8 55 13 15 13 45 135 -7 49 1 22 49 16 28 48 16 18 50 1 58 -109 0 0 49 0 15 13 15 15 46 136 -6 48 52 42 49 7 49 48 7 33 49 53 23 -108 0 0 48 51 16 13 15 17 46 137 -5 48 43 42 48 58 51 47 58 30 49 44 30 -107 0 0 48 41 59 13 15 19 47 138 -5 48 34 25 48 49 35 47 49 8 49 35 18 -106 0 0 48 32 23 13 15 21 47 140 -4 48 24 48 48 39 59 47 39 27 49 25 47 -105 0 0 48 22 29 13 15 23 48 141 -3 48 14 52 48 30 5 47 29 27 49 15 58 -104 0 0 48 12 15 13 15 25 48 142 -3 48 4 38 48 19 52 47 19 8 49 5 50 -103 0 0 48 1 42 13 15 27 49 143 -2 47 54 4 48 9 20 47 8 29 48 55 23 -102 0 0 47 50 50 13 15 29 49 145 -1 47 43 12 47 58 30 46 57 32 48 44 37 -101 0 0 47 39 39 13 15 31 50 146 -1 47 32 0 47 47 19 46 46 15 48 33 31 Uncertainty in time = +/- 3 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 0833-01227-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 02 34.0413 DE: +11 55 36.912 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .022 ) * V mag [mag]: 10.4 * B mag [mag]: 10.8 * Apparent position with proper motion RA(deg): 150.8140959131 DE(deg): 11.8637170132 * Equation of equinoxes (radians) : 0.000060737737225 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1624) Rabe approx. diameter [km]: 24 approx. diameter ["]: .010 distance from Earth [AU]: 3.27700 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1274 number of rejected observations: 38 time covered by the observations: 1928 Feb 26 - 2012 Apr 15 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.020, 108° remarks: * orbital elements for (1624) Rabe : Mean anomaly = 340.86786451 deg Arg. of pericenter = 20.69382252 deg Long. of node = 133.43971123 deg Inclination = 1.98613562 deg Eccentricity = 0.08994572 Semimajor axis = 3.19241768 AU Perihelion dist = 2.90527339 AU Mag: H = 11.26, G = 0.15 Epoch of elements : MJD 56222.55300000 TDT (2012 Oct 22.553) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 22 1624 Rabe 13h 17.0m UT 10.4 10 2 34.041 11 55 36.91TYC 0833-01227-1 10.8 17.0 24 0.7 3.277 3.082 -15.75 -79.9717 11.932 -23.13 -11.31 13.2826 0.15618 0.45018 16.85815 -5.86760 -0.00480 0.00177 2000 340.42672620121020.00000 20.693823133.439711 1.9861360.08994572 3.1924177 2.905273411.2 5.00.15 RATE 1.7279240 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.030 102 4.00 0.030 0 0 3 2 056165.0020121022_1227-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 26, 04:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org