IOTA/IOTA-ES occultation update for (1758) Naantali / TYC 1337-01443-1 event on 2009 Jan 02, 19:43 UT Visible from Summary ------- On 2009 Jan 02 UT, the 29 km diameter asteroid (1758) Naantali will occult a 10.3 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.9 mag to 15.2 mag (the magnitude of the asteroid) for at most 2.1 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: 34 * date and approx. time of event: 2009 Jan 02, 19:36 - 2009 Jan 02, 19:51 UT * magnitude of target star: 10.3 * magnitude drop [mag]: 4.9 * estimated maximum duration [s]: 2.1 * Moon: 33 % sunlit, 105° distance * Sun: 174° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 30 * 1 sigma uncertainty interval [path widths]: +/- 1.95 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .053 +/- .034) * 1 sigma uncertainty ellipse (major, minor, PA): ( .053", .034", 84° ) * approx speed of asteroid's shadow [km/s]: 14.0387 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1337-01443-1 by 1758 Naantali on 2009 Jan 2 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 - 41 0 0 32 3 16 19 51 16 3 69 -1 32 12 4 31 54 29 32 46 25 31 20 18 - 40 0 0 32 23 26 19 51 16 4 70 -2 32 32 12 32 14 40 33 6 30 31 40 32 - 39 0 0 32 43 15 19 51 15 5 70 -3 32 52 0 32 34 29 33 26 13 32 0 26 - 38 0 0 33 2 42 19 51 14 6 71 -3 33 11 26 32 53 58 33 45 36 32 19 58 - 37 0 0 33 21 47 19 51 14 6 71 -4 33 30 31 33 13 4 34 4 36 32 39 8 - 36 0 0 33 40 32 19 51 13 7 72 -5 33 49 14 33 31 49 34 23 16 32 57 57 - 35 0 0 33 58 54 19 51 12 8 72 -6 34 7 35 33 50 13 34 41 33 33 16 24 - 34 0 0 34 16 55 19 51 11 9 73 -7 34 25 35 34 8 14 34 59 29 33 34 30 - 33 0 0 34 34 33 19 51 9 10 74 -8 34 43 13 34 25 54 35 17 3 33 52 13 - 32 0 0 34 51 50 19 51 8 11 74 -9 35 0 29 34 43 12 35 34 15 34 9 35 - 31 0 0 35 8 45 19 51 7 12 75 -10 35 17 23 35 0 8 35 51 5 34 26 35 - 30 0 0 35 25 19 19 51 5 13 75 -10 35 33 55 35 16 42 36 7 34 34 43 13 - 29 0 0 35 41 30 19 51 4 13 76 -11 35 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2 57 3 143 0 0 3 16 12 19 36 52 9 289 -14 3 25 0 3 7 25 3 59 21 2 33 13 144 0 0 2 52 35 19 36 50 8 289 -13 3 1 22 2 43 49 3 35 40 2 9 41 145 0 0 2 29 16 19 36 49 7 289 -12 2 38 2 2 20 31 3 12 17 1 46 26 146 0 0 2 6 16 19 36 48 6 289 -11 2 15 1 1 57 31 2 49 12 1 23 30 147 0 0 1 43 34 19 36 47 5 289 -10 1 52 18 1 34 50 2 26 25 1 0 52 148 0 0 1 21 11 19 36 47 4 289 -9 1 29 54 1 12 29 2 3 58 0 38 34 149 0 0 0 59 8 19 36 46 3 289 -8 1 7 50 0 50 27 1 41 51 0 16 36 150 0 0 0 37 25 19 36 46 2 289 -7 0 46 7 0 28 45 1 20 3 .. .. .. 151 0 0 0 16 3 19 36 46 1 289 -6 0 24 44 0 7 23 0 58 36 .. .. .. Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 1337-01443-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 32 33.3393 DE: +19 10 45.344 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 10.3 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1758) Naantali approx. diameter [km]: 29 approx. diameter ["]: .019 distance from Earth [AU]: 2.09100 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 920 number of rejected observations: 19 time covered by the observations: 1942 Feb 18 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.050, 0.028, 83° remarks: * orbital elements for (1758) Naantali : Mean anomaly = 236.29115158 deg Arg. of pericenter = 112.28228080 deg Long. of node = 113.77966573 deg Inclination = 10.82429712 deg Eccentricity = 0.03642359 Semimajor axis = 3.00674927 AU Perihelion dist = 2.89723267 AU Mag: H = 11.08, G = 0.15 Epoch of elements : MJD 54833.82200000 TDT (2009 Jan 02.822) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 2 1758 Naantali 19h 44.0m UT 10.3 6 32 33.339 19 10 45.34TYC 1337-01443-1 11.1 15.2 29 2.1 2.091 -2.257 9.40 59.5581 19.177 -114.93 -22.85 19.7337 0.07975 0.27174 -7.60250 2.23362 0.00055 0.00039 2000 235.56863420081230.00000112.282281113.779666 10.8242970.03642359 3.0067493 2.897232710.9 5.00.15 RATE 1.8904190 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.053 0.034 84 2.95 0.037 0 54774.5020090102_1443-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org