IOTA/IOTA-ES occultation update for (709) Fringilla / TYC 2950-00934-1 event on 2009 Dec 07, 01:59 UT Visible from Summary ------- On 2009 Dec 07 UT, the 97 km diameter asteroid (709) Fringilla will occult a 12.4 mag star in the constellation Auriga for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.7 mag (the magnitude of the asteroid) for at most 8.5 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: 97 * date and approx. time of event: 2009 Dec 07, 01:52 - 2009 Dec 07, 02:08 UT * magnitude of target star: 12.4 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 8.5 * Moon: 71 % sunlit, 44° distance * Sun: 149° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 103 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .025", 104° ) * approx speed of asteroid's shadow [km/s]: 11.3486 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2950-00934-1 by 709 Fringilla on 2009 Dec 7 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 -112 0 0 19 55 9 2 8 28 1 46 -18 20 34 12 19 16 17 21 5 36 18 45 20 -111 0 0 20 51 36 2 8 27 3 46 -20 21 30 42 20 12 41 22 2 8 19 41 42 -110 0 0 21 47 49 2 8 26 4 46 -21 22 26 58 21 8 52 22 58 26 20 37 51 -109 0 0 22 43 47 2 8 25 5 47 -22 23 22 57 22 4 48 23 54 27 21 33 46 -108 0 0 23 39 25 2 8 24 7 47 -23 24 18 37 23 0 26 24 50 7 22 29 22 -107 0 0 24 34 42 2 8 22 8 47 -24 25 13 54 23 55 42 25 45 25 23 24 39 -106 0 0 25 29 35 2 8 20 9 48 -25 26 8 47 24 50 35 26 40 17 24 19 32 -105 0 0 26 24 1 2 8 18 10 48 -26 27 3 12 25 45 2 27 34 42 25 14 0 -104 0 0 27 17 57 2 8 15 12 49 -27 27 57 7 26 39 0 28 28 35 26 7 59 -103 0 0 28 11 23 2 8 13 13 49 -28 28 50 30 27 32 28 29 21 57 27 1 28 -102 0 0 29 4 14 2 8 10 14 50 -29 29 43 18 28 25 22 30 14 43 27 54 25 -101 0 0 29 56 30 2 8 6 15 50 -30 30 35 31 29 17 42 31 6 53 28 46 47 -100 0 0 30 48 8 2 8 3 16 51 -31 31 27 5 30 9 24 31 58 23 29 38 33 - 99 0 0 31 39 7 2 7 59 18 51 -32 32 17 59 31 0 27 32 49 14 30 29 40 - 98 0 0 32 29 24 2 7 55 19 52 -33 33 8 11 31 50 50 33 39 22 31 20 7 - 97 0 0 33 18 59 2 7 51 20 53 -34 33 57 40 32 40 31 34 28 46 32 9 52 - 96 0 0 34 7 50 2 7 47 21 53 -35 34 46 24 33 29 28 35 17 25 32 58 54 - 95 0 0 34 55 55 2 7 43 22 54 -36 35 34 23 34 17 40 36 5 18 33 47 12 - 94 0 0 35 43 14 2 7 38 23 54 -37 36 21 34 35 5 6 36 52 23 34 34 44 - 93 0 0 36 29 46 2 7 33 24 55 -38 37 7 58 35 51 45 37 38 41 35 21 29 - 92 0 0 37 15 29 2 7 29 26 56 -38 37 53 32 36 37 36 38 24 8 36 7 27 - 91 0 0 38 0 22 2 7 24 27 56 -39 38 38 18 37 22 39 39 8 46 36 52 36 - 90 0 0 38 44 26 2 7 19 28 57 -40 39 22 12 38 6 52 39 52 34 37 36 56 - 89 0 0 39 27 40 2 7 13 29 58 -41 40 5 16 38 50 15 40 35 30 38 20 27 - 88 0 0 40 10 3 2 7 8 30 59 -41 40 47 29 39 32 47 41 17 35 39 3 7 - 87 0 0 40 51 35 2 7 3 31 59 -42 41 28 51 40 14 29 41 58 49 39 44 57 - 86 0 0 41 32 15 2 6 57 32 60 -43 42 9 21 40 55 20 42 39 10 40 25 56 - 85 0 0 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41 30 34 46 74 0 0 30 53 33 1 52 9 30 303 0 31 32 18 30 15 0 32 3 28 29 44 18 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 2950-00934-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 51 04.1096 DE: +41 48 26.810 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 12.4 * B mag [mag]: 12.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (709) Fringilla approx. diameter [km]: 97 approx. diameter ["]: .064 distance from Earth [AU]: 2.10200 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 676 number of rejected observations: 80 time covered by the observations: 1906 Feb 16 - 2007 Aug 10 1 sigma uncertainty ellipse (major, minor, PA): 0.029, 0.019, 109° remarks: * orbital elements for (709) Fringilla : Mean anomaly = 96.88679278 deg Arg. of pericenter = 16.63462353 deg Long. of node = 324.52696627 deg Inclination = 16.29746620 deg Eccentricity = 0.11361775 Semimajor axis = 2.91381246 AU Perihelion dist = 2.58275165 AU Mag: H = 9.10, G = 0.15 Epoch of elements : MJD 55172.08300000 TDT (2009 Dec 07.083) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 7 709 Fringilla 1h 59.6m UT 12.4 6 51 4.110 41 48 26.81TYC 2950-00934-1 12.2 13.7 97 8.5 2.102 -2.383 3.09 -3.1195 41.807 147.94 -22.61 1.9936 0.03774 0.32510 -6.36259 0.73978 -0.00271 -0.00149 2000 96.474030200912 5.00000 16.634624324.526966 16.2974660.11361775 2.9138125 2.5827516 9.0 5.00.15 RATE 1.9815800 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.025 104 1.40 0.026 0 54545.5020091207_0934-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 17:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org