IOTA/IOTA-ES occultation update for (2219) Mannucci / TYC 6185-01008-1 event on 2008 May 21, 18:36 UT Visible from Japan, China, SW Asia, Europe Summary ------- On 2008 May 21 UT, the 40 km diameter asteroid (2219) Mannucci will occult a 10.3 mag star in the constellation Libra for observers along a path across Japan, China, SW Asia, Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 15.4 mag (the magnitude of the asteroid) for at most 2.8 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: 28 * date and approx. time of event: 2008 May 21, 18:30 - 2008 May 21, 18:41 UT * midpoint of event [JD]: 2454608.2752 * magnitude of target star: 10.3 * magnitude drop [mag]: 5.1 * estimated maximum duration [s]: 2.8 * Moon: 97 % sunlit, 25° distance * Sun: 174° distance * rough path description: Japan, China, SW Asia, Europe The occultation path -------------------- * approximate projected width [km]: 56 * 1 sigma uncertainty interval [path widths]: +/- 2.41 * 1 sigma uncertainty interval [seconds]: +/- 10.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .091 +/- .058) * 1 sigma uncertainty ellipse (major, minor, PA): ( .094", .053", 108° ) * approx speed of asteroid's shadow [km/s]: 14.1055 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6185-01008-1 by 2219 Mannucci on 2008 May 21 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 11 0 0 44 43 49 18 41 34 6 120 0 45 0 42 44 27 0 46 23 28 .. .. .. 12 0 0 44 24 29 18 41 33 7 121 -1 44 41 22 44 7 42 46 4 4 42 47 57 13 0 0 44 5 8 18 41 32 8 122 -2 44 22 1 43 48 21 45 44 39 42 28 40 14 0 0 43 45 46 18 41 31 9 123 -3 44 2 38 43 29 0 45 25 12 42 9 23 15 0 0 43 26 24 18 41 29 9 123 -4 43 43 15 43 9 39 45 5 45 41 50 5 16 0 0 43 7 2 18 41 28 10 124 -4 43 23 52 42 50 18 44 46 17 41 30 48 17 0 0 42 47 40 18 41 26 11 125 -5 43 4 29 42 30 57 44 26 49 41 11 32 18 0 0 42 28 20 18 41 25 12 125 -6 42 45 8 42 11 38 44 7 23 40 52 17 19 0 0 42 9 1 18 41 23 12 126 -7 42 25 48 41 52 20 43 47 57 40 33 5 20 0 0 41 49 45 18 41 21 13 127 -8 42 6 30 41 33 4 43 28 34 40 13 54 21 0 0 41 30 31 18 41 19 14 127 -8 41 47 15 41 13 52 43 9 12 39 54 47 22 0 0 41 11 20 18 41 16 15 128 -9 41 28 3 40 54 42 42 49 54 39 35 43 23 0 0 40 52 12 18 41 14 16 129 -10 41 8 54 40 35 36 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57 2 247 -3 37 22 19 36 49 32 38 42 46 .. .. .. 152 0 0 37 23 51 18 30 57 1 248 -2 37 40 19 37 7 28 39 0 55 .. .. .. 153 0 0 37 42 0 18 30 56 1 249 -1 37 58 30 37 25 35 39 19 13 .. .. .. Uncertainty in time = +/- 11 secs [Prediction of 2008 Apr 13.0] Data for the target star ------------------------ * name: TYC 6185-01008-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 37 27.4715 DE: -16 27 22.639 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .024 ) * V mag [mag]: 10.3 * B mag [mag]: 11.1 * Apparent position with proper motion RA(deg): 234.4910712558 DE(deg): -16.4868776815 * Equation of equinoxes (radians) : 0.000040466003927 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2219) Mannucci approx. diameter [km]: 40 approx. diameter ["]: .023 distance from Earth [AU]: 2.36600 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 673 number of rejected observations: 20 time covered by the observations: 1931 Oct 11 - 2008 Apr 08 1 sigma uncertainty ellipse (major, minor, PA): 0.089, 0.047, 110° remarks: * orbital elements for (2219) Mannucci : Mean anomaly = 239.89915555 deg Arg. of pericenter = 295.92295932 deg Long. of node = 72.77164060 deg Inclination = 7.59541812 deg Eccentricity = 0.12303096 Semimajor axis = 3.14794929 AU Perihelion dist = 2.76065408 AU Mag: H = 10.90, G = 0.15 Epoch of elements : MJD 54607.77500000 TDT (2008 May 21.775) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 21 2219 Mannucci 18h 36.3m UT 10.3 15 37 27.472-16 27 22.64TYC 6185-01008-1 11.1 15.4 40 2.8 2.366 -2.049 2.61 75.5206 -16.456 -99.91 20.37 18.6048 0.06200 0.70021 -7.93040 0.70330 0.00040 -0.00039 2000 238.5271282008 514.00000295.922959 72.771641 7.5954180.12303096 3.1479493 2.760654110.7 5.00.15 RATE 1.7646660 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.094 0.053 108 3.41 0.055 0 54569.5020080521_1008-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org