IOTA/IOTA-ES occultation update for (394) Arduina / 2UCAC 19984699 event on 2008 Jul 09, 23:28 UT Visible from Brazil, Argentina, Chile Summary ------- On 2008 Jul 09 UT, the 31 km diameter asteroid (394) Arduina will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across Brazil, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 12.8 mag (the magnitude of the asteroid) for at most 3.9 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: 64 * date and approx. time of event: 2008 Jul 09, 23:15 - 2008 Jul 09, 23:40 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 3.9 * Moon: 47 % sunlit, 74° distance * Sun: 160° distance * rough path description: Brazil, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 0.95 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .028", 96° ) * approx speed of asteroid's shadow [km/s]: 8.0703 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 19984699 by 394 Arduina on 2008 Jul 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 - 89 0 0 -15 6 46 23 40 34 21 116 -1 -14 57 33 -15 15 59 -14 40 2 -15 33 29 - 88 0 0 -15 32 17 23 40 29 22 115 -2 -15 23 5 -15 41 28 -15 5 37 -15 58 56 - 87 0 0 -15 57 20 23 40 23 23 115 -3 -15 48 10 -16 6 30 -15 30 44 -16 23 55 - 86 0 0 -16 21 56 23 40 18 24 115 -4 -16 12 47 -16 31 4 -15 55 24 -16 48 26 - 85 0 0 -16 46 4 23 40 12 25 114 -5 -16 36 57 -16 55 11 -16 19 37 -17 12 30 - 84 0 0 -17 9 45 23 40 6 26 114 -6 -17 0 39 -17 18 50 -16 43 21 -17 36 7 - 83 0 0 -17 32 57 23 40 0 27 114 -7 -17 23 53 -17 42 1 -17 6 38 -17 59 15 - 82 0 0 -17 55 42 23 39 53 28 114 -8 -17 46 39 -18 4 45 -17 29 27 -18 21 56 - 81 0 0 -18 17 58 23 39 47 29 113 -9 -18 8 56 -18 27 0 -17 51 47 -18 44 8 - 80 0 0 -18 39 46 23 39 40 30 113 -10 -18 30 46 -18 48 47 -18 13 39 -19 5 53 - 79 0 0 -19 1 6 23 39 33 31 113 -11 -18 52 8 -19 10 5 -18 35 3 -19 27 9 - 78 0 0 -19 21 58 23 39 26 32 113 -12 -19 13 1 -19 30 56 -18 55 59 -19 47 57 - 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9 47 51 -10 42 20 37 0 0 - 9 45 43 23 18 38 43 240 -63 - 9 36 19 - 9 55 8 - 9 18 25 -10 13 1 38 0 0 - 9 16 0 23 18 28 42 239 -62 - 9 6 34 - 9 25 26 - 8 48 38 - 9 43 21 39 0 0 - 8 45 56 23 18 18 41 239 -61 - 8 36 29 - 8 55 23 - 8 18 31 - 9 13 21 40 0 0 - 8 15 33 23 18 9 40 239 -59 - 8 6 5 - 8 25 1 - 7 48 4 - 8 43 0 41 0 0 - 7 44 50 23 17 59 39 239 -58 - 7 35 21 - 7 54 20 - 7 17 19 - 8 12 21 42 0 0 - 7 13 49 23 17 50 37 239 -57 - 7 4 19 - 7 23 20 - 6 46 14 - 7 41 23 43 0 0 - 6 42 30 23 17 41 36 239 -56 - 6 32 59 - 6 52 2 - 6 14 52 - 7 10 7 44 0 0 - 6 10 54 23 17 32 35 239 -55 - 6 1 21 - 6 20 26 - 5 43 13 - 6 38 33 45 0 0 - 5 39 0 23 17 24 34 239 -54 - 5 29 27 - 5 48 34 - 5 11 17 - 6 6 43 46 0 0 - 5 6 51 23 17 15 33 239 -53 - 4 57 17 - 5 16 26 - 4 39 5 - 5 34 37 47 0 0 - 4 34 27 23 17 7 32 239 -52 - 4 24 51 - 4 44 2 - 4 6 37 - 5 2 15 48 0 0 - 4 1 48 23 16 59 31 239 -51 - 3 52 11 - 4 11 24 - 3 33 56 - 4 29 38 49 0 0 - 3 28 55 23 16 51 30 239 -50 - 3 19 17 - 3 38 32 - 3 1 0 - 3 56 48 50 0 0 - 2 55 49 23 16 44 29 239 -49 - 2 46 11 - 3 5 26 - 2 27 52 - 3 23 44 51 0 0 - 2 22 30 23 16 37 28 239 -47 - 2 12 51 - 2 32 9 - 1 54 31 - 2 50 28 52 0 0 - 1 49 1 23 16 30 26 239 -46 - 1 39 21 - 1 58 40 - 1 21 0 - 2 17 0 53 0 0 - 1 15 20 23 16 23 25 239 -45 - 1 5 40 - 1 25 0 - 0 47 17 - 1 43 22 54 0 0 - 0 41 30 23 16 16 24 239 -44 - 0 31 49 - 0 51 11 - 0 13 25 - 1 9 34 55 0 0 - 0 7 31 23 16 10 23 239 -43 0 2 10 - 0 17 13 0 20 35 - 0 35 37 56 0 0 0 26 35 23 16 4 22 239 -42 0 36 17 0 16 54 0 54 43 - 0 1 31 57 0 0 1 0 49 23 15 59 21 239 -41 1 10 32 0 51 7 1 28 59 0 32 41 58 0 0 1 35 9 23 15 53 20 239 -40 1 44 52 1 25 26 2 3 20 1 7 0 59 0 0 2 9 34 23 15 48 19 239 -38 2 19 17 1 59 51 2 37 46 1 41 23 60 0 0 2 44 3 23 15 43 17 239 -37 2 53 46 2 34 20 3 12 16 2 15 52 61 0 0 3 18 35 23 15 39 16 239 -36 3 28 19 3 8 51 3 46 49 2 50 23 62 0 0 3 53 9 23 15 34 15 239 -35 4 2 53 3 43 26 4 21 24 3 24 57 63 0 0 4 27 45 23 15 31 14 239 -34 4 37 29 4 18 1 4 55 59 3 59 32 64 0 0 5 2 20 23 15 27 13 239 -33 5 12 5 4 52 36 5 30 35 4 34 7 65 0 0 5 36 55 23 15 24 12 239 -32 5 46 39 5 27 11 6 5 10 5 8 41 66 0 0 6 11 28 23 15 21 11 239 -30 6 21 12 6 1 44 6 39 43 5 43 14 67 0 0 6 45 57 23 15 18 9 239 -29 6 55 42 6 36 13 7 14 12 6 17 44 68 0 0 7 20 23 23 15 15 8 239 -28 7 30 7 7 10 39 7 48 37 6 52 10 69 0 0 7 54 44 23 15 13 7 240 -27 8 4 28 7 45 0 8 22 58 7 26 32 70 0 0 8 28 59 23 15 11 6 240 -26 8 38 42 8 19 15 8 57 12 8 0 47 71 0 0 9 3 6 23 15 10 5 240 -25 9 12 50 8 53 23 9 31 18 8 34 56 72 0 0 9 37 6 23 15 9 4 240 -24 9 46 49 9 27 23 10 5 17 9 8 56 73 0 0 10 10 57 23 15 8 3 240 -23 10 20 39 10 1 14 10 39 6 9 42 48 74 0 0 10 44 37 23 15 7 2 240 -21 10 54 19 10 34 55 11 12 45 10 16 30 75 0 0 11 18 7 23 15 7 0 241 -20 11 27 48 11 8 25 11 46 13 10 50 1 Uncertainty in time = +/- 5 secs [Prediction of 2008 Jul 3.0] Data for the target star ------------------------ * name: 2UCAC 19984699 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 54 25.9708 DE: -28 44 29.159 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 11.4 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (394) Arduina approx. diameter [km]: 31 approx. diameter ["]: .031 distance from Earth [AU]: 1.36400 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 868 number of rejected observations: 84 time covered by the observations: 1902 Apr 29 - 2008 May 11 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.018, 98° remarks: * orbital elements for (394) Arduina : Mean anomaly = 321.04109859 deg Arg. of pericenter = 269.40581192 deg Long. of node = 67.36833878 deg Inclination = 6.22168010 deg Eccentricity = 0.22900048 Semimajor axis = 2.76248482 AU Perihelion dist = 2.12987447 AU Mag: H = 9.67, G = 0.15 Epoch of elements : MJD 54656.97800000 TDT (2008 Jul 09.978) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 9 394 Arduina 23h 28.3m UT 11.4 17 54 25.971-28 44 29.162UCAC 19984699 0.0 12.8 31 3.9 1.364 -2.199 -4.97 -11.7292 -28.740 -170.72 22.22 23.4712 -0.01019 0.05649 -4.48913 -0.77237 0.00180 0.00045 2000 319.5431912008 7 3.00000269.405812 67.368339 6.2216800.22900048 2.7624848 2.1298745 9.7 5.00.15 RATE 2.1466150 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.028 96 1.95 0.030 0 54650.5020080709_984699 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 03, 00:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org