IOTA/IOTA-ES occultation update for (326) Tamara / TYC 2973-00237-1 event on 2007 Sep 02, 11:42 UT Visible from USA, Mexico Summary ------- On 2007 Sep 02 UT, the 93 km diameter asteroid (326) Tamara will occult a 10.6 mag star in the constellation Lynx for observers along a path across USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 mag to 15.0 mag (the magnitude of the asteroid) for at most 2.5 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: 91 * date and approx. time of event: 2007 Sep 02, 11:39 - 2007 Sep 02, 11:45 UT * magnitude of target star: 10.6 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 2.5 * Moon: 68 % sunlit, 69° distance * Sun: 46° distance * rough path description: USA, Mexico The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .021 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .021", .020", 93° ) * approx speed of asteroid's shadow [km/s]: 37.8939 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2973-00237-1 by 326 Tamara on 2007 Sep 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 -133 0 0 .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 12 23 15 -132 0 0 12 3 58 11 39 45 1 51 -43 11 30 26 12 37 37 .. .. .. 13 12 2 -131 0 0 12 52 41 11 39 45 2 51 -42 12 19 6 13 26 22 11 44 56 14 0 49 -130 0 0 13 41 21 11 39 45 3 51 -40 13 7 44 14 15 4 12 33 33 14 49 34 -129 0 0 14 29 58 11 39 45 4 51 -39 13 56 20 15 3 43 13 22 7 15 38 14 -128 0 0 15 18 30 11 39 46 6 52 -38 14 44 50 15 52 15 14 10 36 16 26 48 -127 0 0 16 6 53 11 39 46 7 52 -37 15 33 13 16 40 39 14 58 58 17 15 12 -126 0 0 16 55 6 11 39 47 8 52 -36 16 21 26 17 28 52 15 47 11 18 3 26 -125 0 0 17 43 7 11 39 47 9 52 -34 17 9 27 18 16 53 16 35 13 18 51 26 -124 0 0 18 30 55 11 39 48 11 53 -33 17 57 15 19 4 40 17 23 1 19 39 12 -123 0 0 19 18 26 11 39 49 12 53 -32 18 44 47 19 52 10 18 10 35 20 26 41 -122 0 0 20 5 39 11 39 50 13 53 -31 19 32 2 20 39 21 18 57 51 21 13 50 -121 0 0 20 52 32 11 39 50 14 54 -30 20 18 57 21 26 12 19 44 48 22 0 39 -120 0 0 21 39 3 11 39 51 16 54 -29 21 5 31 22 12 41 20 31 25 22 47 6 -119 0 0 22 25 11 11 39 52 17 55 -27 21 51 42 22 58 47 21 17 38 23 33 8 -118 0 0 23 10 54 11 39 53 18 55 -26 22 37 28 23 44 26 22 3 28 24 18 44 -117 0 0 23 56 11 11 39 55 19 55 -25 23 22 48 24 29 39 22 48 52 25 3 53 -116 0 0 24 40 59 11 39 56 20 56 -24 24 7 40 25 14 22 23 33 48 25 48 33 -115 0 0 25 25 17 11 39 57 22 56 -23 24 52 3 25 58 36 24 18 15 26 32 42 -114 0 0 26 9 4 11 39 58 23 57 -22 25 35 55 26 42 18 25 2 12 27 16 19 -113 0 0 26 52 19 11 40 0 24 57 -21 26 19 15 27 25 28 25 45 37 27 59 23 -112 0 0 27 35 0 11 40 1 25 58 -20 27 2 1 28 8 4 26 28 29 28 41 53 -111 0 0 28 17 6 11 40 3 26 58 -18 27 44 14 28 50 4 27 10 47 29 23 47 -110 0 0 28 58 37 11 40 4 27 59 -17 28 25 50 29 31 29 27 52 30 30 5 5 -109 0 0 29 39 31 11 40 6 28 60 -16 29 6 51 30 12 16 28 33 37 30 45 46 -108 0 0 30 19 47 11 40 7 29 60 -15 29 47 14 30 52 26 29 14 7 31 25 49 -107 0 0 30 59 25 11 40 9 30 61 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0 0 44 6 40 11 43 47 59 274 54 43 37 48 44 35 34 43 8 26 45 5 8 8 0 0 43 44 30 11 43 50 58 276 54 43 15 31 44 13 33 42 46 0 44 43 15 9 0 0 43 21 43 11 43 52 57 277 54 42 52 35 43 50 54 42 22 57 44 20 45 10 0 0 42 58 17 11 43 54 56 278 55 42 29 1 43 27 37 41 59 14 43 57 36 11 0 0 42 34 13 11 43 56 56 279 55 42 4 48 43 3 41 41 34 53 43 33 48 12 0 0 42 9 29 11 43 58 55 280 55 41 39 56 42 39 5 41 9 52 43 9 22 13 0 0 41 44 5 11 44 0 54 281 55 41 14 24 42 13 51 40 44 11 42 44 16 14 0 0 41 18 2 11 44 2 53 282 56 40 48 12 41 47 56 40 17 50 42 18 30 15 0 0 40 51 18 11 44 4 52 283 56 40 21 20 41 21 21 39 50 49 41 52 4 16 0 0 40 23 54 11 44 6 52 284 56 39 53 46 40 54 5 39 23 7 41 24 57 17 0 0 39 55 48 11 44 9 51 285 56 39 25 32 40 26 8 38 54 44 40 57 10 18 0 0 39 27 2 11 44 11 50 286 56 38 56 37 39 57 31 38 25 40 40 28 41 19 0 0 38 57 33 11 44 13 49 287 56 38 27 0 39 28 11 37 55 54 39 59 30 20 0 0 38 27 24 11 44 15 48 288 56 37 56 41 38 58 10 37 25 26 39 29 38 21 0 0 37 56 32 11 44 17 47 289 56 37 25 41 38 27 27 36 54 17 38 59 5 22 0 0 37 24 58 11 44 19 46 290 56 36 53 58 37 56 2 36 22 26 38 27 49 23 0 0 36 52 42 11 44 21 45 291 56 36 21 34 37 23 55 35 49 53 37 55 50 24 0 0 36 19 44 11 44 23 44 291 56 35 48 27 36 51 6 35 16 37 37 23 10 25 0 0 35 46 4 11 44 25 43 292 56 35 14 39 36 17 34 34 42 40 36 49 47 26 0 0 35 11 42 11 44 27 42 293 56 34 40 8 35 43 21 34 8 2 36 15 42 27 0 0 34 36 38 11 44 29 41 294 56 34 4 56 35 8 25 33 32 41 35 40 55 28 0 0 34 0 53 11 44 32 40 294 56 33 29 3 34 32 48 32 56 39 35 5 26 29 0 0 33 24 26 11 44 34 39 295 56 32 52 28 33 56 29 32 19 56 34 29 16 30 0 0 32 47 18 11 44 35 38 296 55 32 15 12 33 19 29 31 42 32 33 52 24 31 0 0 32 9 29 11 44 37 37 297 55 31 37 15 32 41 47 31 4 28 33 14 50 32 0 0 31 31 0 11 44 39 36 297 55 30 58 39 32 3 26 30 25 44 32 36 36 33 0 0 30 51 51 11 44 41 35 298 54 30 19 23 31 24 24 29 46 21 31 57 42 34 0 0 30 12 3 11 44 43 34 298 54 29 39 28 30 44 43 29 6 19 31 18 9 35 0 0 29 31 37 11 44 45 33 299 54 28 58 55 30 4 24 28 25 39 30 37 56 36 0 0 28 50 33 11 44 47 32 300 53 28 17 45 29 23 27 27 44 23 29 57 6 37 0 0 28 8 53 11 44 49 31 300 53 27 35 58 28 41 53 27 2 30 29 15 38 38 0 0 27 26 37 11 44 50 30 301 52 26 53 36 27 59 42 26 20 2 28 33 34 39 0 0 26 43 46 11 44 52 29 301 52 26 10 40 27 16 57 25 37 0 27 50 54 40 0 0 26 0 22 11 44 54 27 302 51 25 27 11 26 33 38 24 53 26 27 7 40 41 0 0 25 16 25 11 44 55 26 302 51 24 43 10 25 49 46 24 9 20 26 23 54 42 0 0 24 31 58 11 44 57 25 303 50 23 58 38 25 5 23 23 24 43 25 39 35 43 0 0 23 47 1 11 44 58 24 303 49 23 13 37 24 20 30 22 39 38 24 54 46 44 0 0 23 1 36 11 45 0 23 304 49 22 28 8 23 35 9 21 54 6 24 9 29 45 0 0 22 15 44 11 45 1 22 304 48 21 42 13 22 49 21 21 8 8 23 23 44 46 0 0 21 29 27 11 45 2 20 305 47 20 55 54 22 3 7 20 21 46 22 37 33 47 0 0 20 42 48 11 45 4 19 305 46 20 9 12 21 16 30 19 35 1 21 50 58 48 0 0 19 55 47 11 45 5 18 305 45 19 22 9 20 29 30 18 47 56 21 4 1 49 0 0 19 8 26 11 45 6 17 306 45 18 34 46 19 42 11 18 0 32 20 16 44 50 0 0 18 20 48 11 45 7 15 306 44 17 47 7 18 54 34 17 12 52 19 29 7 51 0 0 17 32 53 11 45 8 14 306 43 16 59 12 18 6 41 16 24 57 18 41 15 52 0 0 16 44 46 11 45 9 13 307 42 16 11 4 17 18 33 15 36 48 17 53 7 53 0 0 15 56 26 11 45 10 12 307 41 15 22 45 16 30 13 14 48 29 17 4 47 54 0 0 15 7 57 11 45 10 10 307 40 14 34 17 15 41 43 14 0 2 16 16 17 55 0 0 14 19 20 11 45 11 9 308 39 13 45 41 14 53 6 13 11 27 15 27 38 56 0 0 13 30 38 11 45 11 8 308 38 12 57 1 14 4 22 12 22 48 14 38 52 57 0 0 12 41 53 11 45 12 7 308 37 12 8 17 13 15 35 11 34 7 13 50 3 58 0 0 11 53 6 11 45 12 5 308 36 11 19 33 12 26 46 10 45 25 13 1 11 59 0 0 11 4 21 11 45 13 4 308 35 10 30 50 11 37 57 9 56 46 12 12 20 60 0 0 10 15 38 11 45 13 3 309 34 9 42 11 10 49 11 9 8 10 11 23 31 61 0 0 9 27 1 11 45 13 2 309 33 8 53 38 10 0 30 8 19 40 10 34 46 62 0 0 8 38 31 11 45 13 0 309 32 .. .. .. 9 11 56 .. .. .. 9 46 8 Data for the target star ------------------------ * name: TYC 2973-00237-1 * constellation : Lynx * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 11 37.4669 DE: +38 31 35.615 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .016 ) * V mag [mag]: 10.6 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (326) Tamara approx. diameter [km]: 93 approx. diameter ["]: .038 distance from Earth [AU]: 3.35100 * orbital information: orbit source: Preston date of fit: 2007 Aug 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 657 number of rejected observations: 60 time covered by the observations: 1900 Oct 22 - 2007 Mar 06 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.011, 98° remarks: * orbital elements for (326) Tamara : Mean anomaly = 196.76534564 deg Arg. of pericenter = 238.54943146 deg Long. of node = 32.32848841 deg Inclination = 23.72154983 deg Eccentricity = 0.19062677 Semimajor axis = 2.31762516 AU Perihelion dist = 1.87582375 AU Mag: H = 9.28, G = 0.15 Epoch of elements : MJD 54345.48800000 TDT (2007 Sep 02.488) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Sep 02 326 Tamara 11h 42.5m UT 10.6 8 11 37.467 38 31 35.61TYC 2973-00237-1 11.9 15.0 93 2.5 3.351 4.781 -2.00 -33.962 38.527 4.33 7.95 11.7081 .00860 .22143 21.37481 -0.76178 -0.00341 0.00211 2000 195.2323062007 828.00000238.549431 32.328488 23.7215500.190626772.317625161.875823759.365 0.15 RATE 2.7934390 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.021 0.020 92.6 1.510 0.020 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Aug 28, 23:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org