IOTA/IOTA-ES occultation update for (344) Desiderata / TYC 0638-00068-1 event on 2009 Nov 16, 05:55 UT Visible from USA Summary ------- On 2009 Nov 16 UT, the 127 km diameter asteroid (344) Desiderata will occult a 11.0 mag star in the constellation Aries for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 12.0 mag (the magnitude of the asteroid) for at most 8.9 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: 99 * date and approx. time of event: 2009 Nov 16, 05:49 - 2009 Nov 16, 06:02 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 8.9 * Moon: 1 % sunlit, 171° distance * Sun: 166° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 138 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .024", 66° ) * approx speed of asteroid's shadow [km/s]: 14.1576 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0638-00068-1 by 344 Desiderata on 2009 Nov 16 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 165 0 0 29 0 44 6 2 44 9 80 0 29 39 18 28 22 21 30 0 59 28 0 56 166 0 0 29 13 52 6 2 43 10 80 -1 29 52 25 28 35 30 30 14 5 28 14 6 167 0 0 29 26 52 6 2 41 11 81 -2 30 5 24 28 48 31 30 27 4 28 27 8 168 0 0 29 39 45 6 2 40 12 81 -3 30 18 16 29 1 25 30 39 55 28 40 2 169 0 0 29 52 29 6 2 38 12 82 -4 30 30 59 29 14 10 30 52 37 28 52 47 170 0 0 30 5 4 6 2 36 13 82 -5 30 43 33 29 26 47 31 5 11 29 5 25 171 0 0 30 17 31 6 2 35 14 83 -6 30 55 59 29 39 15 31 17 36 29 17 53 172 0 0 30 29 49 6 2 33 15 83 -6 31 8 15 29 51 34 31 29 52 29 30 13 173 0 0 30 41 58 6 2 31 16 84 -7 31 20 23 30 3 44 31 41 59 29 42 24 174 0 0 30 53 58 6 2 29 17 84 -8 31 32 22 30 15 45 31 53 57 29 54 26 175 0 0 31 5 49 6 2 26 18 85 -9 31 44 11 30 27 37 32 5 46 30 6 18 176 0 0 31 17 30 6 2 24 18 85 -10 31 55 51 30 39 19 32 17 25 30 18 1 177 0 0 31 29 1 6 2 22 19 86 -11 32 7 21 30 50 52 32 28 54 30 29 35 178 0 0 31 40 23 6 2 19 20 87 -12 32 18 42 31 2 15 32 40 14 30 40 58 179 0 0 31 51 34 6 2 17 21 87 -12 32 29 52 31 13 28 32 51 24 30 52 12 180 0 0 32 2 36 6 2 14 22 88 -13 32 40 52 31 24 31 33 2 23 31 3 16 -179 0 0 32 13 28 6 2 11 23 88 -14 32 51 43 31 35 24 33 13 13 31 14 9 -178 0 0 32 24 9 6 2 8 24 89 -15 33 2 23 31 46 6 33 23 52 31 24 52 -177 0 0 32 34 40 6 2 5 24 89 -16 33 12 52 31 56 38 33 34 21 31 35 25 -176 0 0 32 45 0 6 2 2 25 90 -17 33 23 11 32 7 0 33 44 39 31 45 48 -175 0 0 32 55 10 6 1 59 26 91 -18 33 33 20 32 17 11 33 54 47 31 55 59 -174 0 0 33 5 9 6 1 56 27 91 -18 33 43 17 32 27 11 34 4 43 32 6 0 -173 0 0 33 14 57 6 1 53 28 92 -19 33 53 4 32 37 1 34 14 30 32 15 51 -172 0 0 33 24 34 6 1 49 29 93 -20 34 2 40 32 46 39 34 24 5 32 25 30 -171 0 0 33 34 0 6 1 46 29 93 -21 34 12 5 32 56 7 34 33 29 32 34 58 -170 0 0 33 43 15 6 1 42 30 94 -22 34 21 18 33 5 23 34 42 42 32 44 15 -169 0 0 33 52 19 6 1 39 31 95 -23 34 30 21 33 14 28 34 51 43 32 53 21 -168 0 0 34 1 12 6 1 35 32 95 -23 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278 -30 23 13 50 21 56 32 23 35 37 21 35 2 - 26 0 0 22 20 13 5 49 19 15 278 -29 22 58 58 21 41 41 23 20 44 21 20 10 - 25 0 0 22 5 21 5 49 17 14 279 -28 22 44 5 21 26 49 23 5 52 21 5 18 - 24 0 0 21 50 29 5 49 15 13 279 -27 22 29 13 21 11 57 22 50 59 20 50 27 - 23 0 0 21 35 38 5 49 13 13 279 -27 22 14 21 20 57 6 22 36 7 20 35 36 - 22 0 0 21 20 47 5 49 12 12 280 -26 21 59 30 20 42 16 22 21 16 20 20 46 - 21 0 0 21 5 58 5 49 10 11 280 -25 21 44 40 20 27 27 22 6 26 20 5 57 - 20 0 0 20 51 10 5 49 9 10 281 -24 21 29 51 20 12 39 21 51 37 19 51 10 - 19 0 0 20 36 23 5 49 7 9 281 -23 21 15 5 19 57 53 21 36 50 19 36 24 - 18 0 0 20 21 39 5 49 6 8 281 -22 21 0 20 19 43 9 21 22 4 19 21 41 - 17 0 0 20 6 57 5 49 5 7 282 -21 20 45 37 19 28 28 21 7 21 19 7 0 - 16 0 0 19 52 18 5 49 4 6 282 -20 20 30 57 19 13 49 20 52 41 18 52 21 - 15 0 0 19 37 41 5 49 3 5 282 -19 20 16 20 18 59 14 20 38 4 18 37 46 - 14 0 0 19 23 8 5 49 3 4 283 -18 20 1 46 18 44 42 20 23 30 18 23 14 - 13 0 0 19 8 39 5 49 2 3 283 -17 19 47 16 18 30 13 20 8 59 18 8 46 - 12 0 0 18 54 14 5 49 2 2 283 -16 19 32 50 18 15 48 19 54 32 17 54 22 - 11 0 0 18 39 53 5 49 2 1 284 -15 19 18 28 18 1 28 19 40 10 17 40 2 Uncertainty in time = +/- 3 secs Prediction of 2009 Nov 15.0 Data for the target star ------------------------ * name: TYC 0638-00068-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 32 19.9115 DE: +13 10 54.824 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .022 ) * V mag [mag]: 11.0 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (344) Desiderata approx. diameter [km]: 127 approx. diameter ["]: .098 distance from Earth [AU]: 1.78800 * orbital information: orbit source: Preston date of fit: 2009 Oct 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 800 number of rejected observations: 67 time covered by the observations: 1909 Dec 16 - 2009 Oct 27 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.012, 54° remarks: * orbital elements for (344) Desiderata : Mean anomaly = 83.84684778 deg Arg. of pericenter = 237.39128043 deg Long. of node = 48.21691648 deg Inclination = 18.35597661 deg Eccentricity = 0.31632946 Semimajor axis = 2.59364107 AU Perihelion dist = 1.77319599 AU Mag: H = 8.22, G = 0.15 Epoch of elements : MJD 55151.24700000 TDT (2009 Nov 16.247) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Nov 16 344 Desiderata 5h 55.9m UT 11.0 2 32 19.911 13 10 54.82TYC 0638-00068-1 11.5 12.0 127 8.9 1.788 -2.682 2.94 -106.3416 13.182 87.22 -18.78 5.9320 0.03040 0.39134 -7.96859 0.59762 0.00129 0.00061 2000 83.55260520091115.00000237.391280 48.216916 18.3559770.31632946 2.5936411 1.7731960 8.1 5.00.15 RATE 2.3596050 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.024 66 1.28 0.027 0 055150.0020091116_0068-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Oct 29, 19:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org