IOTA/IOTA-ES occultation update for (2109) Dhotel / TYC 5717-00177-1 event on 2007 Aug 05, 08:38 UT Visible from USA, Mexico, SE Australia Summary ------- On 2007 Aug 05 UT, the 18 km diameter asteroid (2109) Dhotel will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across USA, Mexico, SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.7 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: 15 * date and approx. time of event: 2007 Aug 05, 08:24 - 2007 Aug 05, 08:53 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 2.5 * Moon: 56 % sunlit, 104° distance * Sun: 156° distance * rough path description: USA, Mexico, SE Australia The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 4.41 * 1 sigma uncertainty interval [seconds]: +/- 12.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .109 +/- .080) * 1 sigma uncertainty ellipse (major, minor, PA): ( .110", .080", 86° ) * approx speed of asteroid's shadow [km/s]: 7.3437 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5717-00177-1 by 2109 Dhotel on 2007 Aug 05 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 ... .. .. 31 0 0 .. .. .. .. .. .. ... .. .. ... .. .. - 69 28 22 ... .. .. - 70 9 2 30 0 0 8 24 25 3 254 -20 - 70 28 51 - 69 49 0 - 73 15 43 - 66 42 7 - 73 49 37 29 0 0 8 24 29 7 252 -23 - 74 7 17 - 73 31 48 - 76 37 38 - 70 47 55 Latitude Latitude Latitude Latitude - 75 0 0 28 39 15 8 24 32 8 251 -24 28 44 24 28 34 7 29 29 48 27 48 41 - 76 0 0 28 20 58 8 24 34 9 251 -25 28 26 8 28 15 48 29 11 40 27 30 14 - 77 0 0 28 2 6 8 24 36 10 251 -26 28 7 17 27 56 56 28 52 58 27 11 14 - 78 0 0 27 42 41 8 24 38 11 250 -27 27 47 53 27 37 29 28 33 42 26 51 39 - 79 0 0 27 22 42 8 24 41 11 250 -27 27 27 55 27 17 29 28 13 52 26 31 30 - 80 0 0 27 2 8 8 24 44 12 249 -28 27 7 22 26 56 55 27 53 29 26 10 47 - 81 0 0 26 41 1 8 24 47 13 249 -29 26 46 16 26 35 46 27 32 31 25 49 29 - 82 0 0 26 19 20 8 24 51 14 248 -30 26 24 35 26 14 4 27 11 0 25 27 38 - 83 0 0 25 57 4 8 24 54 15 248 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-39 41 46 126 0 0 -38 51 35 8 52 39 17 92 -1 -38 46 42 -38 56 28 -38 3 42 -39 39 29 125 0 0 -38 48 49 8 52 42 16 93 -1 -38 43 56 -38 53 41 -38 0 54 -39 36 45 124 0 0 -38 45 34 8 52 46 15 94 0 -38 40 41 -38 50 27 -37 57 37 -39 33 32 123 0 0 -38 41 50 8 52 49 15 94 1 -38 36 57 -38 46 44 -37 53 52 -39 29 51 122 0 0 -38 37 38 8 52 51 14 95 2 -38 32 45 -38 42 32 -37 49 37 -39 25 41 121 0 0 -38 32 57 8 52 54 13 95 2 -38 28 4 -38 37 51 -37 44 53 -39 21 3 120 0 0 -38 27 47 8 52 57 12 96 3 -38 22 53 -38 32 42 -37 39 40 -39 15 56 119 0 0 -38 22 8 8 52 59 12 97 4 -38 17 14 -38 27 3 -37 33 58 -39 10 21 118 0 0 -38 16 0 8 53 2 11 97 5 -38 11 5 -38 20 55 -37 27 45 -39 4 16 117 0 0 -38 9 22 8 53 4 10 98 5 -38 4 27 -38 14 17 -37 21 3 -38 57 42 116 0 0 -38 2 14 8 53 6 9 98 6 -37 57 19 -38 7 10 -37 13 51 -38 50 39 115 0 0 -37 54 37 8 53 8 8 99 7 -37 49 41 -37 59 33 -37 6 9 -38 43 6 114 0 0 -37 46 29 8 53 9 8 100 8 -37 41 32 -37 51 26 -36 57 56 -38 35 3 113 0 0 -37 37 51 8 53 11 7 100 8 -37 32 54 -37 42 48 -36 49 13 -38 26 30 112 0 0 -37 28 42 8 53 12 6 101 9 -37 23 44 -37 33 40 -36 39 59 -38 17 27 111 0 0 -37 19 3 8 53 13 5 101 10 -37 14 4 -37 24 1 -36 30 13 -38 7 53 110 0 0 -37 8 52 8 53 14 4 102 11 -37 3 53 -37 13 51 -36 19 57 -37 57 49 109 0 0 -36 58 10 8 53 15 4 103 11 -36 53 11 -37 3 10 -36 9 8 -37 47 14 108 0 0 -36 46 57 8 53 16 3 103 12 -36 41 57 -36 51 57 -35 57 48 -37 36 7 107 0 0 -36 35 12 8 53 16 2 104 13 -36 30 10 -36 40 13 -35 45 56 -37 24 29 106 0 0 -36 22 54 8 53 17 1 104 14 -36 17 52 -36 27 56 -35 33 31 -37 12 19 105 0 0 -36 10 4 8 53 17 0 105 15 -36 5 1 -36 15 7 -35 20 33 -36 59 36 Data for the target star ------------------------ * name: TYC 5717-00177-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 22 10.4728 DE: -12 17 36.847 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .038, .036 ) * V mag [mag]: 11.4 * B mag [mag]: 12.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2109) Dhotel approx. diameter [km]: 18 approx. diameter ["]: .020 distance from Earth [AU]: 1.21800 * orbital information: orbit source: Preston date of fit: 2007 Jul 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 708 number of rejected observations: 30 time covered by the observations: 1932 Aug 04 - 2007 Jun 30 1 sigma uncertainty ellipse (major, minor, PA): 0.103, 0.072, 85° remarks: * orbital elements for (2109) Dhotel : Mean anomaly = 327.05480775 deg Arg. of pericenter = 192.32863522 deg Long. of node = 162.28673723 deg Inclination = 8.06299587 deg Eccentricity = 0.25874088 Semimajor axis = 2.69312278 AU Perihelion dist = 1.99630182 AU Mag: H = 11.76, G = 0.15 Epoch of elements : MJD 54317.36000000 TDT (2007 Aug 05.360) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 05 2109 Dhotel 8h 38.8m UT 11.4 19 22 10.473-12 17 36.85TYC 5717-00177-1 12.8 14.7 18 2.5 1.218 -1.687 -16.83 207.309 -12.289 51.81 17.03 8.6474 .02604 -.03886 -3.42768 -2.33065 0.00204 -0.00054 2000 325.4134712007 729.00000192.328635162.286737 8.0629960.258740882.693122781.9963018211.95 0.15 RATE 2.2300770 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.110 0.080 85.6 5.410 0.090 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 29, 02:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org