IOTA/IOTA-ES occultation update for (4418) Fredfranklin / TYC 5645-00446-1 event on 2009 May 10, 18:12 UT Visible from Summary ------- On 2009 May 10 UT, the 11 km diameter asteroid (4418) Fredfranklin will occult a 10.5 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 15.6 mag (the magnitude of the asteroid) for at most 1.4 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: 5 * date and approx. time of event: 2009 May 10, 17:59 - 2009 May 10, 18:25 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 1.4 * Moon: 97 % sunlit, 22° distance * Sun: 148° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 12.64 * 1 sigma uncertainty interval [seconds]: +/- 13.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .159 +/- .073) * 1 sigma uncertainty ellipse (major, minor, PA): ( .159", .073", 88° ) * approx speed of asteroid's shadow [km/s]: 7.8589 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5645-00446-1 by 4418 Fredfranklin on 2009 May 10 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 35 32 15 40 0 0 18 25 20 3 104 -17 35 47 51 35 16 24 41 27 49 ... .. .. 39 54 52 39 0 0 18 25 16 7 107 -21 40 7 20 39 42 18 44 52 21 33 32 6 Latitude Latitude Latitude Latitude 40 0 0 38 58 41 18 25 15 7 107 -21 39 1 54 38 55 28 40 22 55 37 33 56 41 0 0 38 42 49 18 25 14 8 107 -21 38 46 3 38 39 35 40 7 26 37 17 40 42 0 0 38 26 8 18 25 12 9 108 -22 38 29 23 38 22 54 39 51 11 37 0 34 43 0 0 38 8 39 18 25 10 9 108 -23 38 11 55 38 5 23 39 34 7 36 42 39 44 0 0 37 50 20 18 25 8 10 109 -24 37 53 37 37 47 3 39 16 15 36 23 52 45 0 0 37 31 10 18 25 6 11 110 -24 37 34 28 37 27 53 38 57 34 36 4 14 46 0 0 37 11 9 18 25 4 12 110 -25 37 14 28 37 7 50 38 38 2 35 43 43 47 0 0 36 50 16 18 25 1 13 111 -26 36 53 36 36 46 56 38 17 40 35 22 19 48 0 0 36 28 29 18 24 58 14 111 -27 36 31 51 36 25 8 37 56 25 35 0 0 49 0 0 36 5 48 18 24 55 15 112 -27 36 9 11 36 2 26 37 34 17 34 36 45 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0 0 -68 43 29 17 59 12 2 253 -2 -68 40 17 -68 46 42 .. .. .. -70 7 58 -133 0 0 -68 36 14 17 59 11 2 252 -1 -68 33 1 -68 39 27 .. .. .. -70 1 7 -132 0 0 -68 28 35 17 59 11 2 251 -1 -68 25 21 -68 31 49 .. .. .. -69 53 53 -131 0 0 -68 20 31 17 59 11 1 250 -1 -68 17 16 -68 23 47 .. .. .. -69 46 17 -130 0 0 -68 12 3 17 59 11 1 249 0 -68 8 47 -68 15 19 .. .. .. -69 38 17 -129 0 0 -68 3 9 17 59 11 0 248 0 -67 59 52 -68 6 26 .. .. .. -69 29 52 Uncertainty in time = +/- 20 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 5645-00446-1 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 15 33.9683 DE: -08 23 04.466 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .022 ) * V mag [mag]: 10.5 * B mag [mag]: 11.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4418) Fredfranklin approx. diameter [km]: 11 approx. diameter ["]: .011 distance from Earth [AU]: 1.33200 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 737 number of rejected observations: 7 time covered by the observations: 1931 Oct 20 - 2008 Mar 10 1 sigma uncertainty ellipse (major, minor, PA): 0.158, 0.069, 88° remarks: * orbital elements for (4418) Fredfranklin : Mean anomaly = 330.15575837 deg Arg. of pericenter = 83.29141360 deg Long. of node = 203.90657582 deg Inclination = 12.64913713 deg Eccentricity = 0.15468461 Semimajor axis = 2.58126456 AU Perihelion dist = 2.18198267 AU Mag: H = 12.59, G = 0.15 Epoch of elements : MJD 54961.75900000 TDT (2009 May 10.759) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 10 4418 Fredfranklin 18h 12.3m UT 10.5 17 15 33.968- 8 23 4.47TYC 5645-00446-1 11.4 15.6 11 1.4 1.332 -1.127 24.06 117.1520 -8.392 -93.96 17.80 18.2043 -0.20002 -0.13916 -2.53022 3.64338 -0.00265 -0.00097 2000 329.7377152009 5 9.00000 83.291414203.906576 12.6491370.15468461 2.5812646 2.181982712.4 5.00.15 RATE 2.3765950 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.159 0.073 88 13.64 0.144 0 54581.5020090510_0446-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org