IOTA/IOTA-ES occultation update for (105) Artemis / TYC 5382-00234-1 event on 2009 Jan 06, 01:16 UT Visible from Summary ------- On 2009 Jan 06 UT, the 116 km diameter asteroid (105) Artemis will occult a 11.0 mag star in the constellation Monoceros 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 12.7 mag (the magnitude of the asteroid) for at most 8.7 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 91 * date and approx. time of event: 2009 Jan 06, 01:10 - 2009 Jan 06, 01:21 UT * magnitude of target star: 11.0 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 8.7 * Moon: 67 % sunlit, 74° distance * Sun: 147° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 175 * 1 sigma uncertainty interval [path widths]: +/- 0.50 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .045) * 1 sigma uncertainty ellipse (major, minor, PA): ( .045", .039", 0° ) * approx speed of asteroid's shadow [km/s]: 13.3721 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5382-00234-1 by 105 Artemis on 2009 Jan 6 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 55 53 5 1 21 23 0 109 -24 56 43 45 55 3 18 .. .. .. .. .. .. - 98 0 0 55 41 56 1 21 23 1 109 -24 56 32 39 54 52 7 57 24 17 .. .. .. - 97 0 0 55 30 39 1 21 23 2 110 -25 56 21 24 54 40 47 57 13 6 .. .. .. - 96 0 0 55 19 13 1 21 23 2 111 -26 56 10 1 54 29 18 57 1 45 .. .. .. - 95 0 0 55 7 38 1 21 22 3 112 -26 55 58 29 54 17 41 56 50 16 .. .. .. - 94 0 0 54 55 55 1 21 22 3 113 -27 55 46 48 54 5 56 56 38 38 53 16 46 - 93 0 0 54 44 4 1 21 21 4 114 -27 55 34 59 53 54 2 56 26 51 53 4 51 - 92 0 0 54 32 5 1 21 21 5 114 -28 55 23 2 53 42 1 56 14 57 52 52 47 - 91 0 0 54 19 58 1 21 20 5 115 -28 55 10 57 53 29 52 56 2 54 52 40 36 - 90 0 0 54 7 43 1 21 19 6 116 -29 54 58 45 53 17 35 55 50 43 52 28 18 - 89 0 0 53 55 21 1 21 18 7 117 -30 54 46 24 53 5 11 55 38 25 52 15 52 - 88 0 0 53 42 51 1 21 18 7 118 -30 54 33 57 52 52 40 55 25 59 52 3 19 - 87 0 0 53 30 15 1 21 16 8 118 -31 54 21 21 52 40 2 55 13 26 51 50 39 - 86 0 0 53 17 31 1 21 15 8 119 -31 54 8 39 52 27 17 55 0 45 51 37 53 - 85 0 0 53 4 41 1 21 14 9 120 -32 53 55 50 52 14 25 54 47 58 51 25 0 - 84 0 0 52 51 44 1 21 13 10 121 -33 53 42 55 52 1 27 54 35 4 51 12 1 - 83 0 0 52 38 41 1 21 12 10 122 -33 53 29 53 51 48 23 54 22 3 50 58 55 - 82 0 0 52 25 31 1 21 10 11 122 -34 53 16 45 51 35 12 54 8 56 50 45 44 - 81 0 0 52 12 16 1 21 8 12 123 -34 53 3 30 51 21 57 53 55 43 50 32 28 - 80 0 0 51 58 56 1 21 7 12 124 -35 52 50 11 51 8 35 53 42 24 50 19 6 - 79 0 0 51 45 30 1 21 5 13 125 -36 52 36 45 50 55 9 53 28 59 50 5 38 - 78 0 0 51 31 59 1 21 3 13 126 -36 52 23 15 50 41 37 53 15 29 49 52 7 - 77 0 0 51 18 23 1 21 1 14 127 -37 52 9 39 50 28 1 53 1 54 49 38 30 - 76 0 0 51 4 42 1 20 59 15 127 -38 51 55 59 50 14 20 52 48 14 49 24 49 - 75 0 0 50 50 58 1 20 57 15 128 -38 51 42 14 50 0 35 52 34 29 49 11 4 - 74 0 0 50 37 9 1 20 55 16 129 -39 51 28 25 49 46 47 52 20 40 48 57 16 - 73 0 0 50 23 16 1 20 52 17 130 -40 51 14 33 49 32 54 52 6 47 48 43 23 - 72 0 0 50 9 20 1 20 50 17 131 -40 51 0 36 49 18 59 51 52 51 48 29 28 - 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Uncertainty in time = +/- 4 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 5382-00234-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 44 45.1680 DE: -09 58 46.100 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .035, .044 ) * V mag [mag]: 11.0 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (105) Artemis approx. diameter [km]: 116 approx. diameter ["]: .090 distance from Earth [AU]: 1.78700 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 911 number of rejected observations: 91 time covered by the observations: 1915 Jun 20 - 2008 Oct 21 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.011, 96° remarks: * orbital elements for (105) Artemis : Mean anomaly = 232.94559667 deg Arg. of pericenter = 56.54848941 deg Long. of node = 188.33940736 deg Inclination = 21.45684138 deg Eccentricity = 0.17591263 Semimajor axis = 2.37424558 AU Perihelion dist = 1.95658580 AU Mag: H = 8.62, G = 0.10 Epoch of elements : MJD 54837.05300000 TDT (2009 Jan 06.053) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 6 105 Artemis 1h 16.1m UT 11.0 6 44 45.168- 9 58 46.10TYC 5382-00234-1 12.3 12.7 116 8.7 1.787 -2.487 5.50 -23.6088 -9.980 162.40 -22.50 1.2691 0.11075 0.74101 -7.46487 1.11452 0.00059 0.00316 2000 231.04544020081230.00000 56.548489188.339407 21.4568410.17591263 2.3742456 1.9565858 8.6 5.00.10 RATE 2.6941120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.045 0.039 0 1.50 0.045 0 54774.5020090106_0234-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org