IOTA/IOTA-ES occultation update for (2512) Tavastia / TYC 4685-00161-1 event on 2012 Oct 07, 05:37 UT Visible from Europe, Caribbean, Mexico Summary ------- On 2012 Oct 07 UT, the 12 km diameter asteroid (2512) Tavastia will occult a 9.2 mag star in the constellation Cetus for observers along a path across Europe, Caribbean, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 14.7 mag (the magnitude of the asteroid) for at most 1.4 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: 19 * date and approx. time of event: 2012 Oct 07, 05:26 - 2012 Oct 07, 05:48 UT * geocentric midpoint of event [JD]: 2456207.73427083 * magnitude of target star: 9.2 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 1.4 * Moon: 61 % sunlit, 71° distance * Sun: 168° distance * rough path description: Europe, Caribbean, Mexico The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 3.53 * 1 sigma uncertainty interval [seconds]: +/- 6.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .071 +/- .056) * 1 sigma uncertainty ellipse (major, minor, PA): ( .074", .052", 66° ) * approx speed of asteroid's shadow [km/s]: 8.6765 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4685-00161-1 by 2512 Tavastia on 2012 Oct 7 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 -170 0 0 9 2 28 5 48 30 0 91 -11 9 6 3 8 58 53 9 31 22 .. .. .. -169 0 0 9 2 8 5 48 30 1 91 -12 9 5 43 8 58 34 9 31 2 .. .. .. -168 0 0 9 2 7 5 48 29 2 91 -13 9 5 42 8 58 32 9 31 0 .. .. .. -167 0 0 9 2 24 5 48 29 3 91 -14 9 5 59 8 58 49 9 31 17 .. .. .. -166 0 0 9 2 59 5 48 28 4 91 -15 9 6 34 8 59 24 9 31 52 8 34 12 -165 0 0 9 3 52 5 48 27 5 91 -16 9 7 27 9 0 17 9 32 45 8 35 6 -164 0 0 9 5 3 5 48 25 6 91 -17 9 8 38 9 1 29 9 33 56 8 36 17 -163 0 0 9 6 32 5 48 24 7 92 -18 9 10 7 9 2 58 9 35 25 8 37 46 -162 0 0 9 8 19 5 48 22 8 92 -19 9 11 54 9 4 45 9 37 12 8 39 33 -161 0 0 9 10 24 5 48 20 9 92 -20 9 13 59 9 6 50 9 39 17 8 41 38 -160 0 0 9 12 47 5 48 17 10 92 -21 9 16 21 9 9 12 9 41 40 8 44 0 -159 0 0 9 15 27 5 48 15 11 92 -22 9 19 2 9 11 52 9 44 20 8 46 40 -158 0 0 9 18 25 5 48 12 12 92 -23 9 21 59 9 14 50 9 47 18 8 49 38 -157 0 0 9 21 40 5 48 9 13 93 -24 9 25 15 9 18 5 9 50 34 8 52 52 -156 0 0 9 25 12 5 48 6 14 93 -25 9 28 47 9 21 38 9 54 7 8 56 25 -155 0 0 9 29 2 5 48 3 15 93 -26 9 32 37 9 25 28 9 57 57 9 0 14 -154 0 0 9 33 9 5 47 59 16 93 -27 9 36 44 9 29 34 10 2 4 9 4 21 -153 0 0 9 37 33 5 47 55 17 93 -28 9 41 8 9 33 58 10 6 29 9 8 44 -152 0 0 9 42 14 5 47 51 18 94 -29 9 45 49 9 38 39 10 11 10 9 13 24 -151 0 0 9 47 12 5 47 47 19 94 -29 9 50 47 9 43 37 10 16 8 9 18 22 -150 0 0 9 52 26 5 47 42 20 94 -30 9 56 1 9 48 51 10 21 23 9 23 35 -149 0 0 9 57 57 5 47 38 21 94 -31 10 1 32 9 54 22 10 26 55 9 29 6 -148 0 0 10 3 44 5 47 33 22 95 -32 10 7 19 10 0 9 10 32 42 9 34 52 -147 0 0 10 9 48 5 47 28 23 95 -33 10 13 23 10 6 12 10 38 47 9 40 55 -146 0 0 10 16 7 5 47 22 23 95 -34 10 19 43 10 12 32 10 45 7 9 47 14 -145 0 0 10 22 43 5 47 17 24 95 -35 10 26 18 10 19 7 10 51 43 9 53 49 -144 0 0 10 29 34 5 47 11 25 96 -36 10 33 10 10 25 59 10 58 36 10 0 39 -143 0 0 10 36 41 5 47 5 26 96 -37 10 40 17 10 33 6 11 5 43 10 7 46 -142 0 0 10 44 4 5 46 59 27 96 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0 0 36 7 30 5 28 31 34 240 -30 36 11 10 36 3 51 36 37 3 35 38 5 - 28 0 0 36 17 35 5 28 25 33 241 -30 36 21 14 36 13 56 36 47 6 35 48 11 - 27 0 0 36 27 28 5 28 19 32 242 -29 36 31 7 36 23 49 36 56 57 35 58 5 - 26 0 0 36 37 9 5 28 13 31 242 -28 36 40 48 36 33 30 37 6 37 36 7 47 - 25 0 0 36 46 38 5 28 7 31 243 -27 36 50 16 36 42 59 37 16 5 36 17 17 - 24 0 0 36 55 55 5 28 1 30 244 -26 36 59 33 36 52 16 37 25 20 36 26 36 - 23 0 0 37 5 0 5 27 56 29 245 -26 37 8 38 37 1 21 37 34 24 36 35 42 - 22 0 0 37 13 52 5 27 50 28 245 -25 37 17 31 37 10 14 37 43 15 36 44 36 - 21 0 0 37 22 33 5 27 45 28 246 -24 37 26 11 37 18 55 37 51 54 36 53 18 - 20 0 0 37 31 1 5 27 40 27 247 -23 37 34 39 37 27 23 38 0 21 37 1 47 - 19 0 0 37 39 16 5 27 35 26 247 -22 37 42 54 37 35 38 38 8 35 37 10 4 - 18 0 0 37 47 19 5 27 30 25 248 -22 37 50 57 37 43 42 38 16 37 37 18 8 - 17 0 0 37 55 10 5 27 26 24 249 -21 37 58 47 37 51 32 38 24 26 37 26 0 - 16 0 0 38 2 47 5 27 21 24 249 -20 38 6 25 37 59 10 38 32 3 37 33 39 - 15 0 0 38 10 12 5 27 17 23 250 -19 38 13 50 38 6 35 38 39 26 37 41 5 - 14 0 0 38 17 24 5 27 13 22 251 -19 38 21 1 38 13 47 38 46 37 37 48 18 - 13 0 0 38 24 23 5 27 9 21 251 -18 38 28 0 38 20 47 38 53 35 37 55 19 - 12 0 0 38 31 10 5 27 5 21 252 -17 38 34 46 38 27 33 39 0 20 38 2 6 - 11 0 0 38 37 43 5 27 1 20 253 -16 38 41 19 38 34 6 39 6 52 38 8 40 - 10 0 0 38 44 3 5 26 57 19 253 -15 38 47 39 38 40 26 39 13 11 38 15 2 - 9 0 0 38 50 10 5 26 54 18 254 -15 38 53 46 38 46 33 39 19 17 38 21 10 - 8 0 0 38 56 3 5 26 50 18 255 -14 38 59 40 38 52 27 39 25 9 38 27 4 - 7 0 0 39 1 44 5 26 47 17 255 -13 39 5 20 38 58 8 39 30 48 38 32 46 - 6 0 0 39 7 11 5 26 44 16 256 -12 39 10 47 39 3 35 39 36 14 38 38 14 - 5 0 0 39 12 24 5 26 41 15 257 -12 39 16 0 39 8 49 39 41 27 38 43 29 - 4 0 0 39 17 25 5 26 38 14 257 -11 39 21 0 39 13 49 39 46 26 38 48 30 - 3 0 0 39 22 12 5 26 36 14 258 -10 39 25 47 39 18 36 39 51 12 38 53 18 - 2 0 0 39 26 45 5 26 33 13 258 -9 39 30 20 39 23 9 39 55 44 38 57 52 - 1 0 0 39 31 4 5 26 31 12 259 -8 39 34 40 39 27 29 40 0 3 39 2 12 0 0 0 39 35 11 5 26 29 11 260 -8 39 38 46 39 31 35 40 4 8 39 6 19 1 0 0 39 39 3 5 26 27 11 260 -7 39 42 38 39 35 28 40 8 0 39 10 13 2 0 0 39 42 42 5 26 25 10 261 -6 39 46 17 39 39 7 40 11 38 39 13 52 3 0 0 39 46 7 5 26 23 9 262 -5 39 49 42 39 42 32 40 15 2 39 17 18 4 0 0 39 49 18 5 26 21 8 262 -5 39 52 53 39 45 43 40 18 13 39 20 30 5 0 0 39 52 16 5 26 20 8 263 -4 39 55 50 39 48 41 40 21 10 39 23 28 6 0 0 39 54 59 5 26 18 7 264 -3 39 58 34 39 51 25 40 23 53 39 26 13 7 0 0 39 57 29 5 26 17 6 264 -2 40 1 4 39 53 55 40 26 22 39 28 43 8 0 0 39 59 45 5 26 16 5 265 -2 40 3 19 39 56 10 40 28 37 39 30 59 9 0 0 40 1 47 5 26 15 5 266 -1 40 5 21 39 58 12 40 30 38 39 33 2 10 0 0 40 3 35 5 26 14 4 266 0 40 7 9 40 0 0 40 32 26 39 34 50 Uncertainty in time = +/- 7 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 4685-00161-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 32 00.0288 DE: -00 34 09.666 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .028 ) * V mag [mag]: 9.2 * B mag [mag]: 10.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2512) Tavastia approx. diameter [km]: 12 approx. diameter ["]: .015 distance from Earth [AU]: 1.12200 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 899 number of rejected observations: 21 time covered by the observations: 1940 Apr 03 - 2012 Sep 14 1 sigma uncertainty ellipse (major, minor, PA): 0.071, 0.045, 64° remarks: * orbital elements for (2512) Tavastia : Mean anomaly = 305.37727274 deg Arg. of pericenter = 14.98489037 deg Long. of node = 69.55627459 deg Inclination = 6.38029073 deg Eccentricity = 0.12099742 Semimajor axis = 2.24371520 AU Perihelion dist = 1.97223146 AU Mag: H = 12.43, G = 0.15 Epoch of elements : MJD 56207.23400000 TDT (2012 Oct 07.234) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 7 2512 Tavastia 5h 37.3m UT 9.2 1 32 0.029- 0 34 9.67TYC 4685-00161-1 10.4 14.7 12 1.4 1.122 -2.466 -10.23 -77.6128 -0.566 92.61 -5.66 5.6225 -0.11090 0.39880 -4.71977 -1.30649 -0.00095 0.00057 2000 303.2558322012 930.00000 14.984890 69.556275 6.3802910.12099742 2.2437152 1.972231412.4 5.00.15 RATE 2.9325980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.074 0.052 66 4.53 0.052 0 0-2 4 056197.0020121007_0161-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 22:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org