IOTA/IOTA-ES occultation update for (946) Poesia / UCAC2 40011153 event on 2009 Feb 01, 22:40 UT Visible from Summary ------- On 2009 Feb 01 UT, the 44 km diameter asteroid (946) Poesia will occult a 11.9 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 2.5 mag to 14.3 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: 73 * date and approx. time of event: 2009 Feb 01, 22:30 - 2009 Feb 01, 22:49 UT * magnitude of target star: 11.9 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 4.8 * Moon: 38 % sunlit, 83° distance * Sun: 159° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 0.79 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .057 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .058", .028", 97° ) * approx speed of asteroid's shadow [km/s]: 9.0508 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 40011153 by 946 Poesia on 2009 Feb 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 - 88 0 0 48 33 52 22 49 21 18 75 -1 48 49 47 48 17 59 49 15 4 47 53 1 - 87 0 0 48 54 0 22 49 18 19 76 -1 49 9 54 48 38 10 49 35 7 48 13 15 - 86 0 0 49 13 47 22 49 14 20 77 -2 49 29 39 48 57 59 49 54 49 48 33 7 - 85 0 0 49 33 12 22 49 10 20 78 -3 49 49 2 49 17 26 50 14 8 48 52 38 - 84 0 0 49 52 16 22 49 7 21 79 -3 50 8 3 49 36 32 50 33 6 49 11 47 - 83 0 0 50 10 58 22 49 3 22 80 -4 50 26 43 49 55 16 50 51 42 49 30 34 - 82 0 0 50 29 18 22 48 59 23 80 -5 50 45 1 50 13 38 51 9 57 49 49 0 - 81 0 0 50 47 16 22 48 55 23 81 -5 51 2 57 50 31 39 51 27 49 50 7 4 - 80 0 0 51 4 53 22 48 51 24 82 -6 51 20 31 50 49 18 51 45 20 50 24 46 - 79 0 0 51 22 8 22 48 47 24 83 -7 51 37 44 51 6 35 52 2 30 50 42 7 - 78 0 0 51 39 2 22 48 43 25 84 -8 51 54 36 51 23 31 52 19 18 50 59 7 - 77 0 0 51 55 34 22 48 38 26 85 -8 52 11 6 51 40 6 52 35 44 51 15 45 - 76 0 0 52 11 46 22 48 34 26 85 -9 52 27 15 51 56 19 52 51 49 51 32 2 - 75 0 0 52 27 35 22 48 30 27 86 -9 52 43 2 52 12 11 53 7 33 51 47 57 - 74 0 0 52 43 4 22 48 25 28 87 -10 52 58 29 52 27 42 53 22 56 52 3 32 - 73 0 0 52 58 12 22 48 21 28 88 -11 53 13 34 52 42 52 53 37 58 52 18 45 - 72 0 0 53 12 58 22 48 16 29 89 -11 53 28 19 52 57 41 53 52 39 52 33 37 - 71 0 0 53 27 24 22 48 12 29 90 -12 53 42 42 53 12 9 54 6 59 52 48 9 - 70 0 0 53 41 29 22 48 7 30 91 -13 53 56 45 53 26 16 54 20 58 53 2 20 - 69 0 0 53 55 14 22 48 2 31 92 -13 54 10 28 53 40 3 54 34 37 53 16 10 - 68 0 0 54 8 38 22 47 58 31 93 -14 54 23 50 53 53 30 54 47 56 53 29 40 - 67 0 0 54 21 42 22 47 53 32 94 -14 54 36 51 54 6 36 55 0 54 53 42 49 - 66 0 0 54 34 26 22 47 48 32 95 -15 54 49 33 54 19 22 55 13 32 53 55 38 - 65 0 0 54 46 50 22 47 43 33 96 -16 55 1 55 54 31 47 55 25 51 54 8 7 - 64 0 0 54 58 54 22 47 38 33 97 -16 55 13 57 54 43 53 55 37 49 54 20 17 - 63 0 0 55 10 38 22 47 34 34 98 -17 55 25 39 54 55 40 55 49 28 54 32 6 - 62 0 0 55 22 3 22 47 29 34 99 -17 55 37 1 55 7 6 56 0 47 54 43 36 - 61 0 0 55 33 8 22 47 24 35 100 -18 55 48 5 55 18 14 56 11 47 54 54 46 - 60 0 0 55 43 54 22 47 19 35 101 -19 55 58 49 55 29 2 56 22 28 55 5 37 - 59 0 0 55 54 21 22 47 14 36 102 -19 56 9 14 55 39 30 56 32 50 55 16 9 - 58 0 0 56 4 29 22 47 9 36 103 -20 56 19 20 55 49 40 56 42 53 55 26 22 - 57 0 0 56 14 18 22 47 4 37 104 -20 56 29 7 55 59 31 56 52 37 55 36 15 - 56 0 0 56 23 48 22 46 59 37 105 -21 56 38 35 56 9 3 57 2 3 55 45 50 - 55 0 0 56 33 0 22 46 54 38 106 -21 56 47 45 56 18 17 57 11 10 55 55 7 - 54 0 0 56 41 53 22 46 48 38 107 -22 56 56 37 56 27 12 57 19 59 56 4 5 - 53 0 0 56 50 28 22 46 43 39 108 -22 57 5 11 56 35 49 57 28 30 56 12 44 - 52 0 0 56 58 45 22 46 38 39 109 -23 57 13 26 56 44 7 57 36 43 56 21 5 - 51 0 0 57 6 44 22 46 33 40 110 -23 57 21 23 56 52 8 57 44 37 56 29 8 - 50 0 0 57 14 25 22 46 28 40 111 -24 57 29 3 56 59 51 57 52 15 56 36 53 - 49 0 0 57 21 49 22 46 22 41 112 -24 57 36 25 57 7 15 57 59 34 56 44 20 - 48 0 0 57 28 55 22 46 17 41 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Uncertainty in time = +/- 8 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: UCAC2 40011153 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 37 59.8610 DE: +23 15 05.797 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .017 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (946) Poesia approx. diameter [km]: 44 approx. diameter ["]: .035 distance from Earth [AU]: 1.73700 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1051 number of rejected observations: 41 time covered by the observations: 1921 May 11 - 2008 Feb 10 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.022, 98° remarks: * orbital elements for (946) Poesia : Mean anomaly = 7.93885708 deg Arg. of pericenter = 39.50204903 deg Long. of node = 69.71002658 deg Inclination = 1.43264369 deg Eccentricity = 0.14225635 Semimajor axis = 3.11974629 AU Perihelion dist = 2.67594256 AU Mag: H = 10.49, G = 0.15 Epoch of elements : MJD 54863.94500000 TDT (2009 Feb 01.945) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 1 946 Poesia 22h 40.3m UT 11.9 7 37 59.861 23 15 5.80UCAC2 40011153 0.0 14.3 44 4.8 1.737 -1.847 4.46 2.1530 23.251 -156.66 -16.85 22.6720 0.09493 0.54375 -5.03169 0.88259 0.00206 -0.00051 2000 7.2332352009 129.00000 39.502049 69.710027 1.4326440.14225635 3.1197463 2.675942610.4 5.00.15 RATE 1.7886490 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.058 0.028 97 1.79 0.028 0 54776.5020090201_011153 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 04:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org