IOTA/IOTA-ES occultation update for (589) Croatia / TYC 0072-00309-1 event on 2009 Dec 01, 00:46 UT Visible from Summary ------- On 2009 Dec 01 UT, the 88 km diameter asteroid (589) Croatia will occult a 10.9 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 13.6 mag (the magnitude of the asteroid) for at most 7.1 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: 94 * date and approx. time of event: 2009 Dec 01, 00:38 - 2009 Dec 01, 00:55 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 7.1 * Moon: 98 % sunlit, 19° distance * Sun: 162° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 88 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .027", 86° ) * approx speed of asteroid's shadow [km/s]: 12.2962 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0072-00309-1 by 589 Croatia on 2009 Dec 1 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 - 99 0 0 -17 14 43 0 55 38 13 80 -1 -16 50 26 -17 39 1 -16 28 6 -18 1 23 - 98 0 0 -17 5 32 0 55 36 14 79 -1 -16 41 14 -17 29 51 -16 18 54 -17 52 14 - 97 0 0 -16 56 9 0 55 34 15 79 -2 -16 31 51 -17 20 29 -16 9 30 -17 42 52 - 96 0 0 -16 46 34 0 55 31 16 79 -3 -16 22 15 -17 10 55 -15 59 53 -17 33 19 - 95 0 0 -16 36 48 0 55 29 17 78 -4 -16 12 28 -17 1 9 -15 50 6 -17 23 35 - 94 0 0 -16 26 50 0 55 26 18 78 -5 -16 2 29 -16 51 12 -15 40 6 -17 13 38 - 93 0 0 -16 16 41 0 55 23 19 78 -6 -15 52 20 -16 41 4 -15 29 56 -17 3 31 - 92 0 0 -16 6 21 0 55 21 20 78 -7 -15 41 58 -16 30 44 -15 19 34 -16 53 12 - 91 0 0 -15 55 50 0 55 18 21 77 -8 -15 31 26 -16 20 14 -15 9 1 -16 42 42 - 90 0 0 -15 45 7 0 55 14 22 77 -9 -15 20 43 -16 9 33 -14 58 17 -16 32 2 - 89 0 0 -15 34 15 0 55 11 23 77 -10 -15 9 50 -15 58 41 -14 47 23 -16 21 10 - 88 0 0 -15 23 11 0 55 8 23 76 -11 -14 58 46 -15 47 38 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0 8 25 35 0 38 53 13 274 -22 8 49 36 8 1 34 9 11 41 7 39 26 58 0 0 8 22 43 0 38 51 12 274 -21 8 46 44 7 58 41 9 8 49 7 36 33 59 0 0 8 19 35 0 38 49 11 274 -20 8 43 37 7 55 33 9 5 42 7 33 25 60 0 0 8 16 12 0 38 48 10 274 -19 8 40 14 7 52 10 9 2 20 7 30 1 61 0 0 8 12 34 0 38 46 9 275 -18 8 36 36 7 48 31 8 58 42 7 26 22 62 0 0 8 8 41 0 38 45 8 275 -17 8 32 43 7 44 37 8 54 50 7 22 28 63 0 0 8 4 32 0 38 43 8 275 -16 8 28 35 7 40 28 8 50 42 7 18 19 64 0 0 8 0 9 0 38 42 7 275 -15 8 24 12 7 36 4 8 46 19 7 13 54 65 0 0 7 55 30 0 38 41 6 275 -15 8 19 34 7 31 25 8 41 41 7 9 14 66 0 0 7 50 36 0 38 41 5 275 -14 8 14 40 7 26 30 8 36 48 7 4 19 67 0 0 7 45 27 0 38 40 4 275 -13 8 9 32 7 21 21 8 31 40 6 59 9 68 0 0 7 40 3 0 38 39 3 276 -12 8 4 8 7 15 56 8 26 17 6 53 44 69 0 0 7 34 24 0 38 39 2 276 -11 7 58 30 7 10 16 8 20 39 6 48 4 70 0 0 7 28 30 0 38 39 1 276 -10 7 52 36 7 4 22 8 14 47 6 42 9 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0072-00309-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 57 21.8511 DE: +05 47 48.180 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .023 ) * V mag [mag]: 10.9 * B mag [mag]: 11.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (589) Croatia approx. diameter [km]: 88 approx. diameter ["]: .059 distance from Earth [AU]: 2.06700 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 840 number of rejected observations: 67 time covered by the observations: 1906 Mar 04 - 2007 Sep 22 1 sigma uncertainty ellipse (major, minor, PA): 0.030, 0.014, 84° remarks: * orbital elements for (589) Croatia : Mean anomaly = 24.46894907 deg Arg. of pericenter = 218.18893173 deg Long. of node = 177.64054640 deg Inclination = 10.81453139 deg Eccentricity = 0.03929641 Semimajor axis = 3.13276105 AU Perihelion dist = 3.00965478 AU Mag: H = 8.95, G = 0.15 Epoch of elements : MJD 55166.03300000 TDT (2009 Dec 01.033) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Dec 1 589 Croatia 0h 47.2m UT 10.9 3 57 21.851 5 47 48.18TYC 0072-00309-1 11.4 13.6 88 7.1 2.067 -1.926 -6.72 -22.4895 5.798 165.42 -21.79 0.7875 0.02277 -0.09797 -6.75754 -1.58226 0.00076 0.00164 2000 23.39657420091125.00000218.188932177.640546 10.8145310.03929641 3.1327611 3.0096548 9.1 5.00.15 RATE 1.7775150 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.027 86 1.46 0.027 0 54545.5020091201_0309-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 17:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org