IOTA/IOTA-ES occultation update for (604) Tekmessa / TYC 6855-03543-1 event on 2009 Jul 09, 21:43 UT Visible from Madagascar, Africa, NE Brazil Summary ------- On 2009 Jul 09 UT, the 65 km diameter asteroid (604) Tekmessa will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across Madagascar, Africa, NE Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.2 mag (the magnitude of the asteroid) for at most 4.9 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: 73 * date and approx. time of event: 2009 Jul 09, 21:35 - 2009 Jul 09, 21:51 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 4.9 * Moon: 95 % sunlit, 43° distance * Sun: 163° distance * rough path description: Madagascar, Africa, NE Brazil The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.79 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .037 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .037", .029", 90° ) * approx speed of asteroid's shadow [km/s]: 13.3173 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6855-03543-1 by 604 Tekmessa on 2009 Jul 9 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 - 56 0 0 - 0 24 57 21 51 28 15 121 -1 - 0 4 41 - 0 45 13 0 27 23 - 1 17 11 - 55 0 0 - 0 57 44 21 51 25 16 121 -2 - 0 37 29 - 1 17 57 - 0 5 28 - 1 49 52 - 54 0 0 - 1 30 16 21 51 23 17 121 -3 - 1 10 3 - 1 50 27 - 0 38 5 - 2 22 19 - 53 0 0 - 2 2 33 21 51 20 19 121 -4 - 1 42 23 - 2 22 42 - 1 10 28 - 2 54 31 - 52 0 0 - 2 34 34 21 51 17 20 121 -5 - 2 14 26 - 2 54 42 - 1 42 35 - 3 26 27 - 51 0 0 - 3 6 20 21 51 13 21 121 -6 - 2 46 14 - 3 26 24 - 2 14 26 - 3 58 6 - 50 0 0 - 3 37 47 21 51 10 22 121 -7 - 3 17 44 - 3 57 50 - 2 46 0 - 4 29 28 - 49 0 0 - 4 8 57 21 51 6 23 121 -8 - 3 48 56 - 4 28 58 - 3 17 16 - 5 0 32 - 48 0 0 - 4 39 49 21 51 3 24 120 -10 - 4 19 50 - 4 59 47 - 3 48 14 - 5 31 17 - 47 0 0 - 5 10 21 21 50 59 25 120 -11 - 4 50 25 - 5 30 16 - 4 18 52 - 6 1 43 - 46 0 0 - 5 40 33 21 50 55 26 120 -12 - 5 20 40 - 6 0 26 - 4 49 11 - 6 31 49 - 45 0 0 - 6 10 25 21 50 51 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6 7 8 - 6 46 48 - 5 35 45 - 7 18 5 88 0 0 - 5 57 14 21 36 30 22 240 -38 - 5 37 21 - 6 17 6 - 5 5 53 - 6 48 27 89 0 0 - 5 27 8 21 36 27 21 240 -37 - 5 7 12 - 5 47 2 - 4 35 41 - 6 18 28 90 0 0 - 4 56 41 21 36 23 20 240 -36 - 4 36 43 - 5 16 39 - 4 5 8 - 5 48 8 91 0 0 - 4 25 55 21 36 20 19 240 -35 - 4 5 55 - 4 45 55 - 3 34 15 - 5 17 28 92 0 0 - 3 54 50 21 36 17 18 240 -34 - 3 34 47 - 4 14 52 - 3 3 4 - 4 46 29 93 0 0 - 3 23 26 21 36 14 17 240 -33 - 3 3 21 - 3 43 31 - 2 31 34 - 4 15 12 94 0 0 - 2 51 45 21 36 12 16 240 -32 - 2 31 37 - 3 11 52 - 1 59 47 - 3 43 36 95 0 0 - 2 19 47 21 36 9 15 240 -31 - 1 59 37 - 2 39 56 - 1 27 43 - 3 11 44 96 0 0 - 1 47 32 21 36 7 14 240 -30 - 1 27 20 - 2 7 43 - 0 55 22 - 2 39 35 97 0 0 - 1 15 2 21 36 5 12 240 -28 - 0 54 48 - 1 35 15 - 0 22 47 - 2 7 10 98 0 0 - 0 42 17 21 36 3 11 240 -27 - 0 22 1 - 1 2 33 0 10 3 - 1 34 30 99 0 0 - 0 9 19 21 36 1 10 240 -26 0 10 59 - 0 29 36 0 43 6 - 1 1 37 100 0 0 0 23 52 21 36 0 9 240 -25 0 44 12 0 3 34 1 16 22 - 0 28 30 101 0 0 0 57 16 21 35 58 8 240 -24 1 17 38 0 36 55 1 49 50 0 4 49 102 0 0 1 30 51 21 35 57 7 240 -23 1 51 14 1 10 28 2 23 29 0 38 20 103 0 0 2 4 35 21 35 56 6 240 -22 2 25 0 1 44 12 2 57 18 1 12 1 104 0 0 2 38 30 21 35 55 4 240 -20 2 58 56 2 18 5 3 31 16 1 45 51 105 0 0 3 12 32 21 35 54 3 240 -19 3 33 0 2 52 6 4 5 22 2 19 50 106 0 0 3 46 42 21 35 54 2 240 -18 4 7 11 3 26 14 4 39 34 2 53 57 107 0 0 4 20 58 21 35 54 1 240 -17 4 41 28 4 0 29 5 13 53 3 28 10 Uncertainty in time = +/- 5 secs Prediction of 2009 Jun 30.0 Data for the target star ------------------------ * name: TYC 6855-03543-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 09 39.1682 DE: -29 37 29.482 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .024 ) * V mag [mag]: 11.4 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (604) Tekmessa approx. diameter [km]: 65 approx. diameter ["]: .037 distance from Earth [AU]: 2.42300 * orbital information: orbit source: Preston date of fit: 2009 Jun 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 896 number of rejected observations: 96 time covered by the observations: 1911 Jan 31 - 2009 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.017, 90° remarks: * orbital elements for (604) Tekmessa : Mean anomaly = 255.81797751 deg Arg. of pericenter = 29.36040125 deg Long. of node = 12.23681086 deg Inclination = 4.42450887 deg Eccentricity = 0.20207728 Semimajor axis = 3.14355170 AU Perihelion dist = 2.50831131 AU Mag: H = 9.37, G = 0.15 Epoch of elements : MJD 55021.90500000 TDT (2009 Jul 09.905) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 9 604 Tekmessa 21h 43.8m UT 11.4 18 9 39.168-29 37 29.48TYC 6855-03543-1 12.5 14.2 65 4.9 2.423 -2.091 0.61 18.4994 -29.625 -144.62 22.25 21.7302 0.00340 0.11896 -7.51481 0.16768 0.00149 0.00061 2000 255.4811032009 7 8.00000 29.360401 12.236811 4.4245090.20207728 3.1435517 2.5083113 9.2 5.00.15 RATE 1.7683710 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.037 0.029 90 1.79 0.029 0 55012.0020090709_3543-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Jun 30, 16:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org