IOTA/IOTA-ES occultation update for (284) Amalia / TYC 4896-01289-1 event on 2008 Mar 06, 01:03 UT Visible from S Africa, SE USA Summary ------- On 2008 Mar 06 UT, the 53 km diameter asteroid (284) Amalia will occult a 11.3 mag star in the constellation Sextans for observers along a path across S Africa, SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 13.9 mag (the magnitude of the asteroid) for at most 4.1 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: 85 * date and approx. time of event: 2008 Mar 06, 00:54 - 2008 Mar 06, 01:11 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 2.7 * estimated maximum duration [s]: 4.1 * Moon: 4 % sunlit, 166° distance * Sun: 161° distance * rough path description: S Africa, SE USA The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 0.61 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .026", 100° ) * approx speed of asteroid's shadow [km/s]: 12.8669 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4896-01289-1 by 284 Amalia on 2008 Mar 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 -108 0 0 33 3 22 1 11 6 12 99 0 33 17 56 32 48 48 33 35 44 32 31 3 -107 0 0 32 56 47 1 11 4 13 99 -1 33 11 22 32 42 12 33 29 10 32 24 26 -106 0 0 32 49 48 1 11 3 14 100 -2 33 4 24 32 35 12 33 22 13 32 17 25 -105 0 0 32 42 25 1 11 1 15 100 -3 32 57 2 32 27 49 33 14 53 32 10 0 -104 0 0 32 34 39 1 10 59 16 101 -4 32 49 17 32 20 1 33 7 9 32 2 11 -103 0 0 32 26 29 1 10 57 17 101 -5 32 41 8 32 11 50 32 59 1 31 53 58 -102 0 0 32 17 55 1 10 55 17 102 -5 32 32 35 32 3 15 32 50 29 31 45 22 -101 0 0 32 8 57 1 10 52 18 103 -6 32 23 38 31 54 16 32 41 34 31 36 22 -100 0 0 31 59 35 1 10 50 19 103 -7 32 14 18 31 44 53 32 32 15 31 26 58 - 99 0 0 31 49 50 1 10 47 20 104 -8 32 4 34 31 35 7 32 22 33 31 17 10 - 98 0 0 31 39 41 1 10 45 21 104 -9 31 54 26 31 24 56 32 12 27 31 6 58 - 97 0 0 31 29 8 1 10 42 22 105 -10 31 43 55 31 14 22 32 1 57 30 56 22 - 96 0 0 31 18 12 1 10 39 23 105 -10 31 33 0 31 3 24 31 51 4 30 45 22 - 95 0 0 31 6 52 1 10 36 23 106 -11 31 21 41 30 52 3 31 39 46 30 33 59 - 94 0 0 30 55 8 1 10 33 24 106 -12 31 9 58 30 40 17 31 28 5 30 22 12 - 93 0 0 30 43 0 1 10 30 25 107 -13 30 57 52 30 28 8 31 16 1 30 10 1 - 92 0 0 30 30 28 1 10 27 26 107 -14 30 45 22 30 15 35 31 3 33 29 57 26 - 91 0 0 30 17 33 1 10 23 27 108 -15 30 32 28 30 2 39 30 50 41 29 44 28 - 90 0 0 30 4 14 1 10 20 28 108 -16 30 19 11 29 49 18 30 37 26 29 31 5 - 89 0 0 29 50 32 1 10 16 29 109 -16 30 5 30 29 35 34 30 23 47 29 17 20 - 88 0 0 29 36 26 1 10 12 30 109 -17 29 51 26 29 21 27 30 9 44 29 3 10 - 87 0 0 29 21 56 1 10 9 30 110 -18 29 36 58 29 6 55 29 55 18 28 48 37 - 86 0 0 29 7 3 1 10 5 31 110 -19 29 22 6 28 52 0 29 40 29 28 33 40 - 85 0 0 28 51 46 1 10 0 32 111 -20 29 6 51 28 36 42 29 25 16 28 18 20 - 84 0 0 28 36 6 1 9 56 33 111 -21 28 51 13 28 21 0 29 9 39 28 2 36 - 83 0 0 28 20 3 1 9 52 34 112 -22 28 35 11 28 4 55 28 53 40 27 46 29 - 82 0 0 28 3 36 1 9 47 35 112 -23 28 18 46 27 48 27 28 37 17 27 29 58 - 81 0 0 27 46 47 1 9 43 36 113 -23 28 1 58 27 31 36 28 20 31 27 13 5 - 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2008 Feb 17 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.016, 112° remarks: * orbital elements for (284) Amalia : Mean anomaly = 245.15471489 deg Arg. of pericenter = 57.61103952 deg Long. of node = 233.95207116 deg Inclination = 8.06283079 deg Eccentricity = 0.22312602 Semimajor axis = 2.35787220 AU Perihelion dist = 1.83176956 AU Mag: H = 10.00, G = 0.11 Epoch of elements : MJD 54531.04400000 TDT (2008 Mar 06.044) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 6 284 Amalia 1h 3.1m UT 11.3 9 54 51.298- 0 27 31.10TYC 4896-01289-1 12.6 13.9 53 4.1 1.704 -2.227 16.95 -31.2018 -0.463 167.05 -5.58 1.0516 0.05372 0.10605 -6.47677 3.28552 0.00180 0.00062 2000 244.8705152008 3 5.00000 57.611040233.952071 8.0628310.22312602 2.3578722 1.831769610.1 5.00.11 RATE 2.7222230 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.026 100 1.61 0.026 0 54523.5020080306_1289-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org