IOTA/IOTA-ES occultation update for (245) Vera / UCAC2 40323088 event on 2009 Sep 09, 04:56 UT Visible from Summary ------- On 2009 Sep 09 UT, the 80 km diameter asteroid (245) Vera will occult a 11.4 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.1 mag (the magnitude of the asteroid) for at most 3.1 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: 45 * date and approx. time of event: 2009 Sep 09, 04:53 - 2009 Sep 09, 04:55 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 3.1 * Moon: 80 % sunlit, 53° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 1.45 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .059", 90° ) * approx speed of asteroid's shadow [km/s]: 25.3000 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 40323088 by 245 Vera on 2009 Sep 9 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 - 66 0 0 17 51 8 4 53 3 1 65 -66 17 25 2 18 17 20 .. .. .. 19 33 52 - 65 0 0 18 18 43 4 53 4 2 65 -65 17 52 35 18 44 57 .. .. .. 20 1 34 - 64 0 0 18 46 23 4 53 4 3 65 -64 18 20 13 19 12 39 .. .. .. 20 29 21 - 63 0 0 19 14 8 4 53 4 4 66 -63 18 47 56 19 40 25 .. .. .. 20 57 12 - 62 0 0 19 41 57 4 53 5 5 66 -62 19 15 44 20 8 16 18 0 13 21 25 8 - 61 0 0 20 9 50 4 53 5 6 66 -62 19 43 35 20 36 10 18 28 0 21 53 6 - 60 0 0 20 37 45 4 53 6 7 67 -61 20 11 29 21 4 7 18 55 50 22 21 6 - 59 0 0 21 5 42 4 53 6 8 67 -60 20 39 25 21 32 5 19 23 43 22 49 8 - 58 0 0 21 33 40 4 53 7 9 68 -59 21 7 22 22 0 4 19 51 37 23 17 10 - 57 0 0 22 1 39 4 53 8 10 68 -58 21 35 20 22 28 3 20 19 32 23 45 12 - 56 0 0 22 29 36 4 53 9 11 68 -57 22 3 17 22 56 2 20 47 26 24 13 13 - 55 0 0 22 57 33 4 53 10 12 69 -56 22 31 13 23 23 59 21 15 20 24 41 13 - 54 0 0 23 25 28 4 53 11 13 69 -55 22 59 7 23 51 54 21 43 13 25 9 9 - 53 0 0 23 53 19 4 53 12 14 70 -54 23 26 58 24 19 46 22 11 3 25 37 3 - 52 0 0 24 21 7 4 53 13 15 70 -54 23 54 46 24 47 35 22 38 49 26 4 52 - 51 0 0 24 48 51 4 53 15 16 70 -53 24 22 29 25 15 18 23 6 32 26 32 36 - 50 0 0 25 16 29 4 53 16 17 71 -52 24 50 7 25 42 57 23 34 11 27 0 15 - 49 0 0 25 44 2 4 53 18 18 71 -51 25 17 40 26 10 30 24 1 44 27 27 47 - 48 0 0 26 11 28 4 53 19 19 72 -50 25 45 6 26 37 55 24 29 11 27 55 12 - 47 0 0 26 38 47 4 53 21 20 72 -49 26 12 25 27 5 14 24 56 31 28 22 29 - 46 0 0 27 5 57 4 53 23 21 73 -48 26 39 37 27 32 24 25 23 43 28 49 38 - 45 0 0 27 32 59 4 53 24 22 73 -47 27 6 39 27 59 25 25 50 47 29 16 38 - 44 0 0 27 59 52 4 53 26 23 74 -46 27 33 32 28 26 17 26 17 43 29 43 27 - 43 0 0 28 26 34 4 53 28 24 75 -45 28 0 16 28 52 58 26 44 28 30 10 6 - 42 0 0 28 53 6 4 53 30 25 75 -44 28 26 48 29 19 29 27 11 4 30 36 34 - 41 0 0 29 19 26 4 53 32 26 76 -43 28 53 10 29 45 48 27 37 28 31 2 49 - 40 0 0 29 45 34 4 53 34 27 76 -42 29 19 19 30 11 55 28 3 41 31 28 53 - 39 0 0 30 11 30 4 53 37 28 77 -41 29 45 16 30 37 50 28 29 42 31 54 43 - 38 0 0 30 37 13 4 53 39 29 78 -40 30 11 0 31 3 31 28 55 30 32 20 20 - 37 0 0 31 2 41 4 53 41 30 78 -39 30 36 31 31 28 58 29 21 5 32 45 42 - 36 0 0 31 27 56 4 53 43 31 79 -38 31 1 47 31 54 11 29 46 26 33 10 50 - 35 0 0 31 52 56 4 53 46 32 79 -37 31 26 48 32 19 9 30 11 33 33 35 42 - 34 0 0 32 17 40 4 53 48 33 80 -37 31 51 35 32 43 51 30 36 25 34 0 19 - 33 0 0 32 42 9 4 53 51 34 81 -36 32 16 5 33 8 18 31 1 1 34 24 40 - 32 0 0 33 6 21 4 53 53 35 82 -35 32 40 20 33 32 28 31 25 22 34 48 44 - 31 0 0 33 30 17 4 53 56 36 82 -34 33 4 18 33 56 22 31 49 26 35 12 31 - 30 0 0 33 53 56 4 53 58 36 83 -33 33 27 59 34 19 58 32 13 13 35 36 0 - 29 0 0 34 17 17 4 54 1 37 84 -32 33 51 22 34 43 17 32 36 44 35 59 12 - 28 0 0 34 40 20 4 54 4 38 85 -31 34 14 28 35 6 17 32 59 56 36 22 5 - 27 0 0 35 3 5 4 54 6 39 86 -30 34 37 16 35 29 0 33 22 51 36 44 40 - 26 0 0 35 25 32 4 54 9 40 86 -29 34 59 45 35 51 24 33 45 28 37 6 56 - 25 0 0 35 47 39 4 54 12 41 87 -28 35 21 55 36 13 29 34 7 46 37 28 53 - 24 0 0 36 9 28 4 54 15 42 88 -27 35 43 46 36 35 14 34 29 45 37 50 30 - 23 0 0 36 30 57 4 54 18 42 89 -27 36 5 18 36 56 41 34 51 25 38 11 48 - 22 0 0 36 52 6 4 54 21 43 90 -26 36 26 31 37 17 47 35 12 45 38 32 46 - 21 0 0 37 12 56 4 54 23 44 91 -25 36 47 23 37 38 34 35 33 45 38 53 24 - 20 0 0 37 33 25 4 54 26 45 92 -24 37 7 55 37 59 0 35 54 26 39 13 41 - 19 0 0 37 53 34 4 54 29 46 93 -23 37 28 7 38 19 6 36 14 47 39 33 38 - 18 0 0 38 13 22 4 54 32 46 94 -22 37 47 58 38 38 51 36 34 47 39 53 15 - 17 0 0 38 32 50 4 54 35 47 95 -21 38 7 29 38 58 16 36 54 26 40 12 30 - 16 0 0 38 51 57 4 54 38 48 96 -21 38 26 39 39 17 19 37 13 45 40 31 24 - 15 0 0 39 10 43 4 54 41 49 97 -20 38 45 28 39 36 2 37 32 43 40 49 58 - 14 0 0 39 29 7 4 54 44 49 98 -19 39 3 56 39 54 24 37 51 19 41 8 10 - 13 0 0 39 47 11 4 54 47 50 99 -18 39 22 3 40 12 24 38 9 35 41 26 1 - 12 0 0 40 4 53 4 54 50 51 100 -17 39 39 48 40 30 3 38 27 29 41 43 30 - 11 0 0 40 22 14 4 54 54 52 102 -16 39 57 12 40 47 21 38 45 2 42 0 39 - 10 0 0 40 39 13 4 54 57 52 103 -16 40 14 14 41 4 17 39 2 14 42 17 25 - 9 0 0 40 55 51 4 55 0 53 104 -15 40 30 56 41 20 51 39 19 4 42 33 51 - 8 0 0 41 12 7 4 55 3 54 105 -14 40 47 15 41 37 5 39 35 33 42 49 54 - 7 0 0 41 28 2 4 55 6 54 107 -13 41 3 13 41 52 56 39 51 39 43 5 36 - 6 0 0 41 43 35 4 55 9 55 108 -12 41 18 49 42 8 26 40 7 25 43 20 57 - 5 0 0 41 58 47 4 55 12 55 109 -11 41 34 4 42 23 35 40 22 48 43 35 56 - 4 0 0 42 13 37 4 55 15 56 111 -11 41 48 57 42 38 21 40 37 50 43 50 34 - 3 0 0 42 28 5 4 55 18 57 112 -10 42 3 28 42 52 47 40 52 30 44 4 50 - 2 0 0 42 42 12 4 55 22 57 114 -9 42 17 38 43 6 50 41 6 49 44 18 45 - 1 0 0 42 55 57 4 55 25 58 115 -8 42 31 26 43 20 33 41 20 46 44 32 18 0 0 0 43 9 21 4 55 28 58 117 -8 42 44 53 43 33 53 41 34 21 44 45 30 1 0 0 43 22 23 4 55 31 59 118 -7 42 57 58 43 46 53 41 47 34 44 58 20 2 0 0 43 35 4 4 55 34 60 120 -6 43 10 42 43 59 30 42 0 26 45 10 49 3 0 0 43 47 23 4 55 37 60 122 -5 43 23 4 44 11 47 42 12 56 45 22 57 4 0 0 43 59 21 4 55 40 61 123 -5 43 35 5 44 23 42 42 25 5 45 34 44 5 0 0 44 10 58 4 55 44 61 125 -4 43 46 44 44 35 16 42 36 52 45 46 9 6 0 0 44 22 13 4 55 47 62 127 -3 43 58 2 44 46 28 42 48 18 45 57 14 7 0 0 44 33 7 4 55 50 62 129 -2 44 8 59 44 57 20 42 59 22 46 7 58 8 0 0 44 43 40 4 55 53 62 130 -2 44 19 34 45 7 50 43 10 5 46 18 20 9 0 0 44 53 52 4 55 56 63 132 -1 44 29 48 45 17 59 43 20 26 46 28 22 10 0 0 45 3 42 4 55 59 63 134 0 44 39 42 45 27 47 43 30 27 46 38 3 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 40323088 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 11 05.8587 DE: +24 12 59.218 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .062, .059 ) * V mag [mag]: 11.4 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (245) Vera approx. diameter [km]: 80 approx. diameter ["]: .041 distance from Earth [AU]: 2.69100 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 649 number of rejected observations: 117 time covered by the observations: 1902 Feb 27 - 2007 Sep 07 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.007, 86° remarks: * orbital elements for (245) Vera : Mean anomaly = 27.76541230 deg Arg. of pericenter = 328.47521105 deg Long. of node = 61.43669903 deg Inclination = 5.15988031 deg Eccentricity = 0.19400423 Semimajor axis = 3.09856049 AU Perihelion dist = 2.49742666 AU Mag: H = 7.63, G = 0.15 Epoch of elements : MJD 55083.20600000 TDT (2009 Sep 09.206) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 9 245 Vera 4h 56.9m UT 11.4 6 11 5.859 24 12 59.22UCAC2 40323088 0.0 13.1 80 3.1 2.691 3.404 2.90 30.1593 24.216 105.11 5.27 4.9489 -0.02374 0.38457 14.25247 0.88638 -0.00535 0.00012 2000 27.1860802009 9 6.00000328.475211 61.436699 5.1598800.19400423 3.0985605 2.4974266 7.8 5.00.15 RATE 1.8070250 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.059 90 2.45 0.059 0 54545.5020090909_323088 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 13:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org