IOTA/IOTA-ES occultation update for (1641) Tana / TYC 7385-00122-1 event on 2008 Jul 07, 21:38 UT Visible from Antarctica, Argentina Summary ------- On 2008 Jul 07 UT, the 26 km diameter asteroid (1641) Tana will occult a 8.2 mag star in the constellation Scorpius for observers along a path across Antarctica, Argentina. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.4 mag to 15.6 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: 38 * date and approx. time of event: 2008 Jul 07, 21:29 - 2008 Jul 07, 21:45 UT * magnitude of target star: 8.2 * magnitude drop [mag]: 7.4 * estimated maximum duration [s]: 2.5 * Moon: 27 % sunlit, 98° distance * Sun: 157° distance * rough path description: Antarctica, Argentina The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 1.75 * 1 sigma uncertainty interval [seconds]: +/- 4.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .032", 89° ) * approx speed of asteroid's shadow [km/s]: 10.2712 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7385-00122-1 by 1641 Tana on 2008 Jul 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 - 66 0 0 -27 13 57 21 45 42 23 119 -1 -27 2 17 -27 25 39 -26 21 44 -28 6 54 - 65 0 0 -28 7 24 21 45 36 25 119 -2 -27 55 40 -28 19 11 -27 14 53 -29 0 40 - 64 0 0 -29 1 0 21 45 29 26 118 -3 -28 49 12 -29 12 50 -28 8 11 -29 54 33 - 63 0 0 -29 54 40 21 45 22 27 117 -5 -29 42 49 -30 6 34 -29 1 35 -30 48 31 - 62 0 0 -30 48 23 21 45 14 28 117 -6 -30 36 28 -31 0 21 -29 55 2 -31 42 31 - 61 0 0 -31 42 6 21 45 7 29 116 -7 -31 30 8 -31 54 8 -30 48 30 -32 36 31 - 60 0 0 -32 35 47 21 44 59 30 115 -8 -32 23 45 -32 47 51 -31 41 55 -33 30 27 - 59 0 0 -33 29 22 21 44 51 31 114 -9 -33 17 16 -33 41 30 -32 35 16 -34 24 16 - 58 0 0 -34 22 48 21 44 43 32 114 -10 -34 10 40 -34 34 59 -33 28 29 -35 17 57 - 57 0 0 -35 16 4 21 44 34 34 113 -11 -35 3 53 -35 28 18 -34 21 32 -36 11 26 - 56 0 0 -36 9 6 21 44 26 35 112 -12 -35 56 52 -36 21 23 -35 14 22 -37 4 41 - 55 0 0 -37 1 52 21 44 17 36 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47 131 0 0 -50 24 57 21 29 44 14 230 -16 -50 12 27 -50 37 30 -49 29 1 -51 21 48 132 0 0 -49 40 54 21 29 41 13 229 -15 -49 28 22 -49 53 30 -48 44 49 -50 37 55 133 0 0 -48 55 58 21 29 39 12 229 -14 -48 43 24 -49 8 35 -47 59 44 -49 53 7 134 0 0 -48 10 9 21 29 36 11 228 -13 -47 57 33 -48 22 47 -47 13 48 -49 7 24 135 0 0 -47 23 28 21 29 34 10 227 -12 -47 10 51 -47 36 8 -46 27 2 -48 20 49 136 0 0 -46 35 57 21 29 31 9 226 -11 -46 23 19 -46 48 38 -45 39 26 -47 33 23 137 0 0 -45 47 37 21 29 29 8 226 -10 -45 34 58 -46 0 18 -44 51 3 -46 45 6 138 0 0 -44 58 29 21 29 28 7 225 -10 -44 45 50 -45 11 11 -44 1 54 -45 56 1 139 0 0 -44 8 36 21 29 26 6 224 -9 -43 55 57 -44 21 19 -43 12 0 -45 6 8 140 0 0 -43 18 0 21 29 25 4 224 -8 -43 5 20 -43 30 42 -42 21 24 -44 15 31 141 0 0 -42 26 41 21 29 24 3 223 -7 -42 14 3 -42 39 23 .. .. .. -43 24 11 142 0 0 -41 34 44 21 29 23 2 222 -5 -41 22 6 -41 47 25 .. .. .. -42 32 10 143 0 0 -40 42 9 21 29 23 1 222 -4 -40 29 32 -40 54 49 .. .. .. -41 39 31 Uncertainty in time = +/- 6 secs [Prediction of 2008 Jul 2.0] Data for the target star ------------------------ * name: TYC 7385-00122-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 43 51.0773 DE: -35 29 58.390 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .019 ) * V mag [mag]: 8.2 * B mag [mag]: 8.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1641) Tana approx. diameter [km]: 26 approx. diameter ["]: .019 distance from Earth [AU]: 1.86700 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 744 number of rejected observations: 24 time covered by the observations: 1909 Sep 21 - 2008 Jun 07 1 sigma uncertainty ellipse (major, minor, PA): 0.040, 0.026, 89° remarks: * orbital elements for (1641) Tana : Mean anomaly = 310.95613210 deg Arg. of pericenter = 0.45499692 deg Long. of node = 331.69138264 deg Inclination = 9.33370334 deg Eccentricity = 0.10511426 Semimajor axis = 3.01941725 AU Perihelion dist = 2.70203344 AU Mag: H = 10.35, G = 0.15 Epoch of elements : MJD 54654.90200000 TDT (2008 Jul 07.902) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 7 1641 Tana 21h 38.1m UT 8.2 17 43 51.077-35 29 58.39TYC 7385-00122-1 8.4 15.6 26 2.5 1.867 -2.116 8.80 15.2274 -35.503 -143.25 22.47 21.6342 -0.17511 -0.51383 -5.48847 1.86713 0.00191 0.00105 2000 310.0352742008 7 3.00000 0.454997331.691383 9.3337030.10511426 3.0194173 2.702033411.4 5.00.15 RATE 1.8785350 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.032 89 2.75 0.034 0 54649.5020080707_0122-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 02, 19:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org