IOTA/IOTA-ES occultation update for (689) Zita / TYC 1298-00784-1 event on 2008 Oct 14, 13:46 UT Visible from Alaska Summary ------- On 2008 Oct 14 UT, the 14 km diameter asteroid (689) Zita will occult a 10.1 mag star in the constellation Taurus for observers along a path across Alaska. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.5 mag (the magnitude of the asteroid) for at most 2.6 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: 22 * date and approx. time of event: 2008 Oct 14, 13:32 - 2008 Oct 14, 13:46 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 2.6 * Moon: 100 % sunlit, 69° distance * Sun: 115° distance * rough path description: Alaska The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 3.02 * 1 sigma uncertainty interval [seconds]: +/- 8.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .036", 87° ) * approx speed of asteroid's shadow [km/s]: 5.5302 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1298-00784-1 by 689 Zita on 2008 Oct 14 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 86 0 0 69 0 29 13 32 51 0 45 -16 68 52 46 69 8 15 .. .. .. 69 55 35 87 0 0 69 22 30 13 32 51 1 46 -16 69 14 50 69 30 11 .. .. .. 70 17 8 88 0 0 69 43 49 13 32 51 1 46 -16 69 36 12 69 51 26 .. .. .. 70 38 0 89 0 0 70 4 28 13 32 52 2 47 -16 69 56 55 70 12 2 .. .. .. 70 58 12 90 0 0 70 24 27 13 32 52 2 48 -17 70 16 58 70 31 57 .. .. .. 71 17 44 91 0 0 70 43 48 13 32 53 3 49 -17 70 36 23 70 51 15 .. .. .. 71 36 38 92 0 0 71 2 32 13 32 54 3 50 -17 70 55 11 71 9 55 .. .. .. 71 54 54 93 0 0 71 20 39 13 32 55 4 51 -17 71 13 22 71 27 58 70 29 44 72 12 34 94 0 0 71 38 11 13 32 55 4 52 -17 71 30 57 71 45 26 70 47 42 72 29 38 95 0 0 71 55 8 13 32 56 5 53 -18 71 47 58 72 2 19 71 5 4 72 46 8 96 0 0 72 11 31 13 32 57 5 54 -18 72 4 25 72 18 39 71 21 53 73 2 4 97 0 0 72 27 22 13 32 59 5 55 -18 72 20 19 72 34 25 71 38 9 73 17 27 98 0 0 72 42 40 13 33 0 6 56 -18 72 35 42 72 49 40 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52 13 43 1 43 210 -8 58 45 9 59 2 36 57 53 12 59 56 9 -120 0 0 58 12 13 13 43 18 44 212 -7 58 3 29 58 20 59 57 11 24 59 14 40 -119 0 0 57 29 37 13 43 36 44 214 -7 57 20 52 57 38 24 56 28 41 58 32 11 -118 0 0 56 46 5 13 43 54 44 215 -6 56 37 19 56 54 53 55 45 3 57 48 45 -117 0 0 56 1 39 13 44 13 45 217 -6 55 52 52 56 10 27 55 0 34 57 4 22 -116 0 0 55 16 20 13 44 32 45 219 -5 55 7 33 55 25 9 54 15 14 56 19 5 -115 0 0 54 30 11 13 44 52 45 221 -4 54 21 25 54 39 0 53 29 6 55 32 55 -114 0 0 53 43 15 13 45 12 45 223 -3 53 34 29 53 52 3 52 42 13 54 45 55 -113 0 0 52 55 33 13 45 33 45 225 -3 52 46 47 53 4 20 51 54 36 53 58 8 -112 0 0 52 7 8 13 45 54 45 227 -2 51 58 24 52 15 55 51 6 18 53 9 36 -111 0 0 51 18 5 13 46 15 45 229 -1 51 9 22 51 26 49 50 17 24 52 20 23 -110 0 0 50 28 25 13 46 37 45 231 0 50 19 44 50 37 8 49 27 55 51 30 31 Uncertainty in time = +/- 10 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 1298-00784-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 43 44.7606 DE: +15 21 25.255 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .020 ) * V mag [mag]: 10.1 * B mag [mag]: 10.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (689) Zita approx. diameter [km]: 14 approx. diameter ["]: .014 distance from Earth [AU]: 1.34300 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 880 number of rejected observations: 44 time covered by the observations: 1955 Nov 16 - 2008 Sep 30 1 sigma uncertainty ellipse (major, minor, PA): 0.050, 0.030, 86° remarks: * orbital elements for (689) Zita : Mean anomaly = 41.10639750 deg Arg. of pericenter = 188.18634553 deg Long. of node = 168.22446613 deg Inclination = 5.74372732 deg Eccentricity = 0.22969213 Semimajor axis = 2.31584298 AU Perihelion dist = 1.78391206 AU Mag: H = 12.24, G = 0.15 Epoch of elements : MJD 54753.57400000 TDT (2008 Oct 14.574) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 14 689 Zita 13h 46.5m UT 10.1 5 43 44.761 15 21 25.25TYC 1298-00784-1 10.3 15.5 14 2.6 1.343 1.218 -10.33 -144.1754 15.361 -30.16 -8.42 13.7755 0.35332 0.60258 2.69354 -1.57731 -0.00475 0.00018 2000 40.10686920081011.00000188.186346168.224466 5.7437270.22969213 2.3158430 1.783912112.2 5.00.15 RATE 2.7966650 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.036 87 4.02 0.043 0 54740.5020081014_0784-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org