IOTA/IOTA-ES occultation update for (3909) Gladys / TYC 0128-00379-1 event on 2008 Jan 11, 07:02 UT Visible from USA, Mexico Summary ------- On 2008 Jan 11 UT, the 15 km diameter asteroid (3909) Gladys will occult a 9.7 mag star in the constellation Orion 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 6.8 mag to 16.5 mag (the magnitude of the asteroid) for at most 1.3 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: 11 * date and approx. time of event: 2008 Jan 11, 06:54 - 2008 Jan 11, 07:11 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 1.3 * Moon: 8 % sunlit, 123° distance * Sun: 152° distance * rough path description: USA, Mexico The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 6.19 * 1 sigma uncertainty interval [seconds]: +/- 11.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .094 +/- .068) * 1 sigma uncertainty ellipse (major, minor, PA): ( .094", .067", 101° ) * approx speed of asteroid's shadow [km/s]: 11.7627 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0128-00379-1 by 3909 Gladys on 2008 Jan 11 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 137 0 0 24 10 39 7 11 7 0 82 14 24 15 6 24 6 13 25 10 23 .. .. .. 138 0 0 24 18 11 7 11 7 1 83 13 24 22 38 24 13 44 25 17 55 .. .. .. 139 0 0 24 25 41 7 11 6 2 83 12 24 30 8 24 21 14 25 25 25 .. .. .. 140 0 0 24 33 9 7 11 6 3 84 11 24 37 36 24 28 42 25 32 52 .. .. .. 141 0 0 24 40 35 7 11 5 4 84 10 24 45 2 24 36 8 25 40 18 .. .. .. 142 0 0 24 47 58 7 11 5 5 84 9 24 52 25 24 43 31 25 47 41 .. .. .. 143 0 0 24 55 19 7 11 4 6 85 8 24 59 46 24 50 52 25 55 2 23 56 2 144 0 0 25 2 38 7 11 3 7 85 8 25 7 4 24 58 11 26 2 20 24 3 21 145 0 0 25 9 53 7 11 2 8 86 7 25 14 20 25 5 27 26 9 35 24 10 37 146 0 0 25 17 6 7 11 0 9 86 6 25 21 33 25 12 39 26 16 48 24 17 50 147 0 0 25 24 16 7 10 59 10 87 5 25 28 43 25 19 50 26 23 57 24 25 1 148 0 0 25 31 23 7 10 57 10 87 4 25 35 50 25 26 56 26 31 4 24 32 8 149 0 0 25 38 27 7 10 55 11 87 3 25 42 53 25 34 0 26 38 7 24 39 12 150 0 0 25 45 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0 22 19 2 6 54 31 5 276 -32 22 23 29 22 14 35 23 18 47 .. .. .. - 38 0 0 22 11 25 6 54 30 4 276 -31 22 15 52 22 6 58 23 11 9 .. .. .. - 37 0 0 22 3 48 6 54 30 4 276 -30 22 8 15 21 59 21 23 3 32 .. .. .. - 36 0 0 21 56 11 6 54 29 3 277 -30 22 0 38 21 51 44 22 55 55 .. .. .. - 35 0 0 21 48 35 6 54 29 2 277 -29 21 53 2 21 44 9 22 48 19 .. .. .. - 34 0 0 21 41 1 6 54 29 1 277 -28 21 45 28 21 36 34 22 40 44 .. .. .. Data for the target star ------------------------ * name: TYC 0128-00379-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 50 29.2188 DE: +07 07 33.786 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .034 ) * V mag [mag]: 9.7 * B mag [mag]: 10.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3909) Gladys approx. diameter [km]: 15 approx. diameter ["]: .011 distance from Earth [AU]: 1.95600 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 660 number of rejected observations: 10 time covered by the observations: 1951 Aug 11 - 2007 Dec 14 1 sigma uncertainty ellipse (major, minor, PA): 0.091, 0.058, 102° remarks: * orbital elements for (3909) Gladys : Mean anomaly = 219.57238301 deg Arg. of pericenter = 25.50001533 deg Long. of node = 218.67882500 deg Inclination = 13.15864135 deg Eccentricity = 0.11831200 Semimajor axis = 2.61211105 AU Perihelion dist = 2.30306697 AU Mag: H = 11.73, G = 0.15 Epoch of elements : MJD 54476.29300000 TDT (2008 Jan 11.293) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 11 3909 Gladys 7h 2.8m UT 9.7 5 50 29.219 7 7 33.79TYC 0128-00379-1 10.2 16.5 15 1.3 1.956 -2.004 0.67 -128.252 7.126 76.21 -21.89 7.0466 .00860 .38890 -6.63756 0.14761 0.00231 0.00159 2000 218.1032052008 1 5.00000 25.500015218.678825 13.1586410.118312002.612111052.3030669712.15 0.15 RATE 2.3346220 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.094 0.067 101.1 7.190 0.065 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org