IOTA/IOTA-ES occultation update for (907) Rhoda / TYC 3379-00309-1 event on 2012 Dec 25, 13:49 UT Visible from Philippines, SE Asia Summary ------- On 2012 Dec 25 UT, the 75 km diameter asteroid (907) Rhoda will occult a 11.8 mag star in the constellation Auriga for observers along a path across Philippines, SE Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.2 mag (the magnitude of the asteroid) for at most 6.7 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: 92 * date and approx. time of event: 2012 Dec 25, 13:41 - 2012 Dec 25, 13:56 UT * geocentric midpoint of event [JD]: 2456287.07585 * magnitude of target star: 11.8 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 6.7 * Moon: 93 % sunlit, 39° distance * Sun: 155° distance * rough path description: Philippines, SE Asia The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .034", 81° ) * approx speed of asteroid's shadow [km/s]: 11.2440 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 3379-00309-1 by 907 Rhoda on 2012 Dec 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 ' " Longitude Longitude Longitude Longitude -168 59 56 -35 0 0 13 41 36 0 336 -22 ... .. .. -169 33 57 ... .. .. -170 6 44 -169 32 4 -34 0 0 13 41 36 1 337 -23 -168 58 27 -170 5 48 -168 26 19 -170 38 21 -170 4 37 -33 0 0 13 41 36 2 337 -24 -169 31 15 -170 38 7 -168 59 21 -171 10 26 -170 37 37 -32 0 0 13 41 37 3 337 -26 -170 4 28 -171 10 55 -169 32 47 -171 43 1 -171 11 6 -31 0 0 13 41 38 5 338 -27 -170 38 9 -171 44 12 -170 6 39 -172 16 7 -171 45 4 -30 0 0 13 41 39 6 338 -28 -171 12 18 -172 18 0 -170 40 58 -172 49 45 -172 19 34 -29 0 0 13 41 40 7 338 -29 -171 46 56 -172 52 20 -171 15 46 -173 23 56 -172 54 35 -28 0 0 13 41 42 8 338 -30 -172 22 6 -173 27 13 -171 51 3 -173 58 42 -173 30 10 -27 0 0 13 41 44 9 339 -31 -172 57 48 -174 2 41 -172 26 52 -174 34 4 -174 6 20 -26 0 0 13 41 46 10 339 -32 -173 34 4 -174 38 46 -173 3 14 -175 10 3 -174 43 7 -25 0 0 13 41 49 11 339 -33 -174 10 55 -175 15 28 -173 40 10 -175 46 41 -175 20 31 -24 0 0 13 41 52 12 340 -34 -174 48 24 -175 52 49 -174 17 42 -176 23 59 -175 58 36 -23 0 0 13 41 55 14 340 -36 -175 26 31 -176 30 52 -174 55 52 -177 2 0 -176 37 23 -22 0 0 13 41 58 15 340 -37 -176 5 18 -177 9 37 -175 34 41 -177 40 44 -177 16 52 -21 0 0 13 42 2 16 340 -38 -176 44 48 -177 49 7 -176 14 11 -178 20 15 -177 57 8 -20 0 0 13 42 6 17 341 -39 -177 25 3 -178 29 24 -176 54 24 -179 0 34 -178 38 11 -19 0 0 13 42 10 18 341 -40 -178 6 4 -179 10 30 -177 35 23 -179 41 42 -179 20 4 -18 0 0 13 42 15 19 341 -41 -178 47 53 -179 52 27 -178 17 9 179 36 16 179 57 10 -17 0 0 13 42 20 20 342 -43 -179 30 34 179 24 42 -178 59 46 178 53 20 179 13 29 -16 0 0 13 42 25 22 342 -44 179 45 52 178 40 54 -179 43 14 178 9 26 178 28 51 -15 0 0 13 42 31 23 342 -45 179 1 21 177 56 8 179 32 22 177 24 31 177 43 12 -14 0 0 13 42 36 24 343 -46 178 15 52 177 10 19 178 47 1 176 38 32 176 56 29 -13 0 0 13 42 43 25 343 -48 177 29 19 176 23 25 178 0 39 175 51 27 176 8 38 -12 0 0 13 42 49 26 343 -49 176 41 41 175 35 21 177 13 12 175 3 10 175 19 37 -11 0 0 13 42 56 27 344 -50 175 52 54 174 46 5 176 24 37 174 13 39 174 29 20 -10 0 0 13 43 4 29 344 -51 175 2 53 173 55 32 175 34 51 173 22 49 173 37 43 - 9 0 0 13 43 11 30 345 -53 174 11 34 173 3 36 174 43 49 172 30 35 172 44 42 - 8 0 0 13 43 19 31 345 -54 173 18 53 172 10 14 173 51 27 171 36 53 171 50 11 - 7 0 0 13 43 28 32 346 -55 172 24 45 171 15 20 172 57 39 170 41 35 170 54 5 - 6 0 0 13 43 36 33 346 -56 171 29 3 170 18 48 172 2 20 169 44 37 169 56 16 - 5 0 0 13 43 46 34 347 -58 170 31 42 169 20 30 171 5 24 168 45 51 168 56 38 - 4 0 0 13 43 55 36 347 -59 169 32 34 168 20 20 170 6 45 167 45 9 167 55 2 - 3 0 0 13 44 5 37 348 -60 168 31 32 167 18 9 169 6 14 166 42 23 166 51 20 - 2 0 0 13 44 16 38 348 -62 167 28 28 166 13 48 168 3 45 165 37 22 165 45 21 - 1 0 0 13 44 27 39 349 -63 166 23 11 165 7 5 166 59 6 164 29 56 164 36 54 0 0 0 13 44 39 40 350 -64 165 15 30 163 57 50 165 52 9 163 19 51 163 25 46 1 0 0 13 44 51 42 351 -66 164 5 14 162 45 47 164 42 40 162 6 53 Latitude Latitude Latitude Latitude 162 0 0 2 9 14 13 45 5 43 352 -67 2 41 18 1 36 53 3 11 49 1 5 32 161 0 0 2 55 42 13 45 16 44 352 -68 3 27 21 2 23 46 3 57 30 1 52 51 160 0 0 3 40 36 13 45 26 45 353 -69 4 11 52 3 9 5 4 41 38 2 38 33 159 0 0 4 23 58 13 45 36 45 354 -70 4 54 51 3 52 50 5 24 17 3 22 41 158 0 0 5 5 50 13 45 47 46 355 -71 5 36 22 4 35 4 6 5 27 4 5 17 157 0 0 5 46 14 13 45 57 47 356 -72 6 16 25 5 15 48 6 45 11 4 46 22 156 0 0 6 25 12 13 46 7 48 357 -73 6 55 3 5 55 6 7 23 31 5 26 0 155 0 0 7 2 45 13 46 18 48 358 -74 7 32 18 6 32 59 8 0 28 6 4 11 154 0 0 7 38 56 13 46 28 49 358 -74 8 8 11 7 9 28 8 36 4 6 40 58 153 0 0 8 13 46 13 46 38 50 359 -75 8 42 44 7 44 35 9 10 21 7 16 22 152 0 0 8 47 17 13 46 49 50 0 -75 9 15 59 8 18 23 9 43 21 7 50 26 151 0 0 9 19 30 13 46 59 51 1 -76 9 47 57 8 50 52 10 15 5 8 23 11 150 0 0 9 50 28 13 47 9 51 2 -76 10 18 40 9 22 4 10 45 34 8 54 38 149 0 0 10 20 11 13 47 19 52 3 -76 10 48 9 9 52 2 11 14 49 9 24 49 148 0 0 10 48 41 13 47 29 52 5 -76 11 16 25 10 20 45 11 42 53 9 53 46 147 0 0 11 15 58 13 47 39 52 6 -76 11 43 30 10 48 16 12 9 47 10 21 29 146 0 0 11 42 6 13 47 49 53 7 -76 12 9 26 11 14 36 12 35 31 10 48 1 145 0 0 12 7 4 13 47 59 53 8 -76 12 34 12 11 39 45 13 0 6 11 13 22 144 0 0 12 30 54 13 48 9 53 9 -76 12 57 52 12 3 46 13 23 35 11 37 34 143 0 0 12 53 37 13 48 19 53 10 -76 13 20 24 12 26 39 13 45 58 12 0 37 142 0 0 13 15 14 13 48 29 54 11 -75 13 41 51 12 48 26 14 7 16 12 22 34 141 0 0 13 35 45 13 48 39 54 12 -75 14 2 14 13 9 7 14 27 30 12 43 24 140 0 0 13 55 13 13 48 49 54 13 -74 14 21 33 13 28 44 14 46 41 13 3 9 139 0 0 14 13 38 13 48 58 54 14 -74 14 39 49 13 47 17 15 4 50 13 21 50 138 0 0 14 31 0 13 49 8 54 16 -73 14 57 4 14 4 47 15 21 57 13 39 28 137 0 0 14 47 20 13 49 18 54 17 -73 15 13 17 14 21 15 15 38 4 13 56 3 136 0 0 15 2 40 13 49 27 54 18 -72 15 28 30 14 36 41 15 53 11 14 11 36 135 0 0 15 17 0 13 49 37 54 19 -71 15 42 44 14 51 7 16 7 18 14 26 8 134 0 0 15 30 20 13 49 46 54 20 -71 15 55 58 15 4 33 16 20 27 14 39 40 133 0 0 15 42 41 13 49 55 54 21 -70 16 8 14 15 17 0 16 32 38 14 52 12 132 0 0 15 54 4 13 50 5 53 22 -69 16 19 32 15 28 28 16 43 51 15 3 44 131 0 0 16 4 29 13 50 14 53 23 -68 16 29 53 15 38 57 16 54 8 15 14 18 130 0 0 16 13 57 13 50 23 53 24 -68 16 39 16 15 48 29 17 3 28 15 23 54 129 0 0 16 22 27 13 50 32 53 25 -67 16 47 44 15 57 3 17 11 51 15 32 32 128 0 0 16 30 1 13 50 41 53 26 -66 16 55 14 16 4 40 17 19 19 15 40 12 127 0 0 16 36 39 13 50 50 52 26 -65 17 1 49 16 11 21 17 25 52 15 46 55 126 0 0 16 42 21 13 50 59 52 27 -64 17 7 29 16 17 5 17 31 29 15 52 41 125 0 0 16 47 6 13 51 8 52 28 -64 17 12 12 16 21 52 17 36 11 15 57 31 124 0 0 16 50 57 13 51 17 51 29 -63 17 16 1 16 25 44 17 39 58 16 1 24 123 0 0 16 53 51 13 51 26 51 30 -62 17 18 55 16 28 40 17 42 51 16 4 21 122 0 0 16 55 51 13 51 34 50 30 -61 17 20 53 16 30 40 17 44 48 16 6 22 121 0 0 16 56 54 13 51 43 50 31 -60 17 21 57 16 31 44 17 45 52 16 7 26 120 0 0 16 57 3 13 51 52 49 32 -59 17 22 6 16 31 52 17 46 1 16 7 34 119 0 0 16 56 16 13 52 0 49 32 -58 17 21 19 16 31 5 17 45 15 16 6 47 118 0 0 16 54 34 13 52 9 48 33 -57 17 19 38 16 29 22 17 43 34 16 5 2 117 0 0 16 51 56 13 52 17 48 33 -57 17 17 1 16 26 43 17 40 59 16 2 22 116 0 0 16 48 23 13 52 26 47 34 -56 17 13 30 16 23 7 17 37 29 15 58 45 115 0 0 16 43 53 13 52 34 47 34 -55 17 9 2 16 18 36 17 33 4 15 54 11 114 0 0 16 38 27 13 52 42 46 35 -54 17 3 39 16 13 7 17 27 43 15 48 40 113 0 0 16 32 5 13 52 50 45 35 -53 16 57 20 16 6 42 17 21 27 15 42 12 112 0 0 16 24 46 13 52 58 45 36 -52 16 50 4 15 59 19 17 14 14 15 34 45 111 0 0 16 16 29 13 53 6 44 36 -51 16 41 51 15 50 59 17 6 5 15 26 21 110 0 0 16 7 15 13 53 14 43 37 -50 16 32 42 15 41 40 16 56 59 15 16 58 109 0 0 15 57 3 13 53 22 43 37 -49 16 22 34 15 31 23 16 46 56 15 6 36 108 0 0 15 45 51 13 53 30 42 37 -48 16 11 28 15 20 6 16 35 55 14 55 15 107 0 0 15 33 41 13 53 38 41 37 -47 15 59 23 15 7 50 16 23 56 14 42 52 106 0 0 15 20 30 13 53 46 41 38 -46 15 46 19 14 54 33 16 10 57 14 29 29 105 0 0 15 6 19 13 53 53 40 38 -45 15 32 14 14 40 15 15 56 59 14 15 5 104 0 0 14 51 6 13 54 1 39 38 -44 15 17 8 14 24 55 15 42 0 13 59 38 103 0 0 14 34 51 13 54 8 38 38 -43 15 1 1 14 8 32 15 26 0 13 43 7 102 0 0 14 17 33 13 54 16 37 39 -42 14 43 51 13 51 5 15 8 57 13 25 32 101 0 0 13 59 11 13 54 23 37 39 -41 14 25 37 13 32 34 14 50 52 13 6 53 100 0 0 13 39 43 13 54 30 36 39 -40 14 6 19 13 12 58 14 31 42 12 47 7 99 0 0 13 19 10 13 54 37 35 39 -39 13 45 56 12 52 14 14 11 28 12 26 13 98 0 0 12 57 29 13 54 44 34 39 -38 13 24 25 12 30 23 13 50 8 12 4 12 97 0 0 12 34 40 13 54 51 33 39 -37 13 1 47 12 7 23 13 27 40 11 41 0 96 0 0 12 10 41 13 54 58 32 39 -36 12 38 0 11 43 12 13 4 4 11 16 38 95 0 0 11 45 32 13 55 5 31 40 -35 12 13 3 11 17 50 12 39 18 10 51 4 94 0 0 11 19 10 13 55 11 30 40 -34 11 46 54 10 51 15 12 13 22 10 24 16 93 0 0 10 51 35 13 55 18 29 40 -33 11 19 32 10 23 25 11 46 13 9 56 13 92 0 0 10 22 44 13 55 24 28 40 -32 10 50 56 9 54 20 11 17 50 9 26 53 91 0 0 9 52 36 13 55 30 27 40 -31 10 21 4 9 23 57 10 48 12 8 56 15 90 0 0 9 21 10 13 55 36 26 40 -30 9 49 53 8 52 15 10 17 16 8 24 16 89 0 0 8 48 24 13 55 42 25 40 -29 9 17 24 8 19 11 9 45 3 7 50 56 88 0 0 8 14 15 13 55 48 24 40 -28 8 43 33 7 44 45 9 11 28 7 16 12 87 0 0 7 38 43 13 55 54 23 40 -27 8 8 19 7 8 53 8 36 32 6 40 2 86 0 0 7 1 45 13 55 59 22 40 -26 7 31 40 6 31 35 8 0 11 6 2 24 85 0 0 6 23 18 13 56 4 21 40 -24 6 53 34 5 52 48 7 22 24 5 23 16 84 0 0 5 43 21 13 56 9 20 40 -23 6 13 59 5 12 29 6 43 9 4 42 36 83 0 0 5 1 52 13 56 14 19 40 -22 5 32 52 4 30 36 6 2 24 4 0 20 82 0 0 4 18 48 13 56 19 18 40 -21 4 50 12 3 47 8 5 20 5 3 16 28 81 0 0 3 34 6 13 56 23 16 40 -20 4 5 55 3 2 0 4 36 12 2 30 55 80 0 0 2 47 44 13 56 28 15 40 -19 3 19 59 2 15 12 3 50 41 1 43 40 79 0 0 1 59 40 13 56 31 14 40 -17 2 32 23 1 26 39 3 3 30 0 54 39 78 0 0 1 9 50 13 56 35 13 40 -16 1 43 2 0 36 19 2 14 37 0 3 50 77 0 0 0 18 12 13 56 38 11 40 -15 0 51 54 - 0 15 51 1 23 57 - 0 48 51 76 0 0 - 0 35 18 13 56 41 10 40 -14 - 0 1 3 - 1 9 53 0 31 30 - 1 43 27 75 0 0 - 1 30 42 13 56 44 9 40 -12 - 0 55 53 - 2 5 52 - 0 22 48 - 2 40 1 74 0 0 - 2 28 4 13 56 47 7 40 -11 - 1 52 39 - 3 3 51 - 1 19 1 - 3 38 36 73 0 0 - 3 27 26 13 56 49 6 40 -10 - 2 51 24 - 4 3 53 - 2 17 11 - 4 39 17 72 0 0 - 4 28 54 13 56 50 5 40 -8 - 3 52 12 - 5 6 2 - 3 17 22 - 5 42 6 71 0 0 - 5 32 29 13 56 51 3 41 -7 - 4 55 5 - 6 10 21 - 4 19 36 - 6 47 9 70 0 0 - 6 38 16 13 56 52 2 41 -6 - 6 0 8 - 7 16 54 - 5 23 57 - 7 54 28 69 0 0 - 7 46 19 13 56 52 0 41 -4 - 7 7 23 .. .. .. .. .. .. .. .. .. Uncertainty in time = +/- 3 secs Prediction of 2012 Dec 17.0 Data for the target star ------------------------ * name: TYC 3379-00309-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 13 10.6849 DE: +48 37 39.417 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .020, .030 ) * V mag [mag]: 11.8 * B mag [mag]: 12.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (907) Rhoda approx. diameter [km]: 75 approx. diameter ["]: .070 distance from Earth [AU]: 1.48600 * orbital information: orbit source: Preston date of fit: 2012 Dec 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 918 number of rejected observations: 52 time covered by the observations: 1918 Nov 13 - 2012 Dec 04 1 sigma uncertainty ellipse (major, minor, PA): 0.028, 0.016, 77° remarks: * orbital elements for (907) Rhoda : Mean anomaly = 334.04162091 deg Arg. of pericenter = 87.38139581 deg Long. of node = 43.14278196 deg Inclination = 19.56384576 deg Eccentricity = 0.16129989 Semimajor axis = 2.80116045 AU Perihelion dist = 2.34933357 AU Mag: H = 9.63, G = 0.15 Epoch of elements : MJD 56286.57600000 TDT (2012 Dec 25.576) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 25 907 Rhoda 13h 49.2m UT 11.8 6 13 10.685 48 37 39.42TYC 3379-00309-1 12.0 13.2 75 6.7 1.486 -3.458 15.30 151.5105 48.622 -27.22 -23.37 13.8204 -0.23968 -0.53705 -5.79399 2.58969 0.00011 -0.00247 2000 332.65914120121219.00000 87.381396 43.142782 19.5638460.16129989 2.8011605 2.3493336 9.8 5.00.15 RATE 2.1023120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.034 81 1.48 0.034 0 0-1-3 056278.0020121225_0309-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Dec 16, 19:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org