IOTA/IOTA-ES occultation update for (781) Kartvelia / TYC 1446-00643-1 event on 2008 Apr 03, 04:15 UT Visible from Greenland, N Africa Summary ------- On 2008 Apr 03 UT, the 66 km diameter asteroid (781) Kartvelia will occult a 11.0 mag star in the constellation Coma Berenices for observers along a path across Greenland, N Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.4 mag (the magnitude of the asteroid) for at most 4.8 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: 79 * date and approx. time of event: 2008 Apr 03, 04:10 - 2008 Apr 03, 04:19 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 4.8 * Moon: 12 % sunlit, 148° distance * Sun: 156° distance * rough path description: Greenland, N Africa The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.69 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .025", 95° ) * approx speed of asteroid's shadow [km/s]: 13.8081 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1446-00643-1 by 781 Kartvelia on 2008 Apr 3 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 21 26 42 15 8 19 4 10 14 7 287 -5 19 45 56 15 24 52 23 39 46 14 41 5 17 51 43 15 39 28 ... .. .. .. .. .. 17 15 51 17 4 51 4 10 22 11 286 -9 16 7 19 17 10 34 18 31 27 16 56 46 14 41 17 17 15 36 20 33 8 16 39 52 14 20 11 18 36 17 4 10 31 14 285 -11 13 23 29 18 37 55 15 20 28 18 33 27 12 10 6 18 38 33 16 51 5 18 27 3 11 56 59 19 56 46 4 10 39 17 284 -13 11 6 49 19 56 5 12 49 30 19 56 40 10 0 54 19 54 2 14 6 31 19 55 1 9 53 4 21 10 43 4 10 47 19 283 -15 9 7 7 21 8 29 10 40 46 21 12 22 8 6 12 21 4 33 11 49 48 21 13 35 8 2 15 22 20 11 4 10 55 21 282 -16 7 19 16 22 16 49 8 46 38 22 23 6 6 21 58 22 11 30 9 50 21 22 26 18 6 21 3 23 26 22 4 11 3 22 281 -17 5 40 16 23 22 7 7 2 59 23 30 15 4 45 42 23 15 40 8 2 54 23 34 55 4 47 16 24 29 59 4 11 11 24 280 -19 4 8 11 24 25 1 5 27 20 24 34 39 3 15 45 24 17 40 6 24 23 24 40 30 3 19 24 25 31 34 4 11 19 25 279 -20 2 41 40 25 25 59 3 58 0 25 36 52 1 50 57 25 17 52 4 52 49 25 43 41 1 56 24 26 31 28 4 11 27 27 278 -20 1 19 46 26 25 22 2 33 50 26 37 19 0 30 25 26 16 34 3 26 52 26 44 56 0 37 28 27 29 57 4 11 35 28 277 -21 0 1 43 27 23 24 1 13 56 27 36 17 - 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60 0 29 74 26 9 - 58 14 5 75 18 21 - 61 6 53 73 50 32 - 56 52 23 75 54 47 - 61 58 15 75 56 19 4 18 51 32 187 -9 - 62 48 49 75 29 11 - 61 4 10 76 23 41 - 63 53 29 74 52 7 - 59 42 54 77 1 49 - 65 13 7 77 1 3 4 18 59 31 184 -8 - 66 1 20 76 32 42 - 64 21 11 77 29 42 - 67 2 34 75 54 3 - 63 2 23 78 9 43 - 69 1 30 78 6 6 4 19 7 30 179 -6 - 69 45 11 77 36 26 - 68 14 5 78 36 8 - 70 40 16 76 56 6 - 67 1 22 79 18 13 - 73 34 45 79 11 0 4 19 15 29 174 -5 - 74 10 20 78 39 57 - 72 55 55 79 42 31 - 74 54 56 77 57 50 - 71 55 48 80 26 48 - 79 9 18 80 14 54 4 19 23 28 169 -4 - 79 30 47 79 42 28 - 78 46 2 80 47 54 - 79 58 3 78 58 35 - 78 10 18 81 34 26 - 86 8 42 81 16 22 4 19 31 26 161 -3 - 86 6 13 80 42 42 - 86 13 4 81 50 40 - 86 5 9 79 57 14 - 86 23 13 82 39 8 - 95 5 27 82 12 50 4 19 39 25 152 -1 - 94 23 7 81 38 27 - 95 57 25 82 47 49 - 93 36 41 80 51 58 - 97 30 47 83 37 4 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 1446-00643-1 * constellation : Coma Berenices * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 32 20.7200 DE: +18 05 40.869 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .019 ) * V mag [mag]: 11.0 * B mag [mag]: 12.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (781) Kartvelia approx. diameter [km]: 66 approx. diameter ["]: .038 distance from Earth [AU]: 2.36900 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 836 number of rejected observations: 58 time covered by the observations: 1926 Feb 15 - 2008 Feb 13 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.016, 99° remarks: * orbital elements for (781) Kartvelia : Mean anomaly = 261.92200101 deg Arg. of pericenter = 157.84199620 deg Long. of node = 138.30842902 deg Inclination = 19.17315232 deg Eccentricity = 0.11093510 Semimajor axis = 3.22070560 AU Perihelion dist = 2.86341631 AU Mag: H = 9.55, G = 0.15 Epoch of elements : MJD 54559.17800000 TDT (2008 Apr 03.178) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 3 781 Kartvelia 4h 15.5m UT 11.0 12 32 20.720 18 5 40.87TYC 1446-00643-1 12.2 14.4 66 4.8 2.369 -1.701 15.76 -67.6565 18.091 116.95 5.44 4.2581 0.39344 0.60596 -6.53431 4.24781 0.00044 -0.00233 2000 260.3569602008 325.00000157.841996138.308429 19.1731520.11093510 3.2207056 2.8634163 9.4 5.00.15 RATE 1.7052090 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.025 95 1.69 0.026 0 54553.5020080403_0643-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org