IOTA/IOTA-ES occultation update for (469) Argentina / TYC 0833-01136-1 event on 2008 Feb 28, 01:28 UT Visible from Arabia, Africa, Caribbean, Mexico Summary ------- On 2008 Feb 28 UT, the 126 km diameter asteroid (469) Argentina will occult a 8.5 mag star in the constellation Leo for observers along a path across Arabia, Africa, Caribbean, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 12.2 mag (the magnitude of the asteroid) for at most 10.9 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: 99 * date and approx. time of event: 2008 Feb 28, 01:19 - 2008 Feb 28, 01:37 UT * magnitude of target star: 8.5 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 10.9 * Moon: 59 % sunlit, 87° distance * Sun: 172° distance * rough path description: Arabia, Africa, Caribbean, Mexico The occultation path -------------------- * approximate projected width [km]: 129 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .025", 116° ) * approx speed of asteroid's shadow [km/s]: 11.5065 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0833-01136-1 by 469 Argentina on 2008 Feb 28 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 -113 0 0 14 59 27 1 37 13 8 80 0 15 35 15 14 23 45 15 56 2 14 3 5 -112 0 0 15 11 28 1 37 12 9 81 -1 15 47 15 14 35 46 16 8 2 14 15 6 -111 0 0 15 23 25 1 37 10 10 81 -2 15 59 11 14 47 43 16 19 59 14 27 4 -110 0 0 15 35 18 1 37 8 11 81 -3 16 11 5 14 59 37 16 31 52 14 38 58 -109 0 0 15 47 8 1 37 6 12 81 -4 16 22 54 15 11 28 16 43 41 14 50 48 -108 0 0 15 58 54 1 37 4 13 82 -5 16 34 40 15 23 14 16 55 26 15 2 35 -107 0 0 16 10 36 1 37 2 14 82 -6 16 46 21 15 34 56 17 7 7 15 14 17 -106 0 0 16 22 13 1 36 59 15 82 -7 16 57 58 15 46 34 17 18 44 15 25 55 -105 0 0 16 33 46 1 36 57 16 82 -8 17 9 30 15 58 7 17 30 16 15 37 29 -104 0 0 16 45 14 1 36 54 17 83 -9 17 20 58 16 9 36 17 41 43 15 48 58 -103 0 0 16 56 37 1 36 51 18 83 -10 17 32 20 16 20 59 17 53 6 16 0 22 -102 0 0 17 7 55 1 36 48 19 83 -11 17 43 38 16 32 18 18 4 23 16 11 40 -101 0 0 17 19 8 1 36 45 20 84 -12 17 54 50 16 43 31 18 15 35 16 22 54 -100 0 0 17 30 15 1 36 41 21 84 -13 18 5 57 16 54 39 18 26 41 16 34 2 - 99 0 0 17 41 17 1 36 38 22 84 -14 18 16 58 17 5 41 18 37 42 16 45 4 - 98 0 0 17 52 13 1 36 34 23 85 -15 18 27 53 17 16 37 18 48 37 16 56 1 - 97 0 0 18 3 2 1 36 31 24 85 -16 18 38 42 17 27 28 18 59 25 17 6 52 - 96 0 0 18 13 46 1 36 27 25 85 -17 18 49 25 17 38 12 19 10 8 17 17 36 - 95 0 0 18 24 23 1 36 23 26 86 -18 19 0 1 17 48 49 19 20 44 17 28 14 - 94 0 0 18 34 53 1 36 18 27 86 -19 19 10 31 17 59 20 19 31 13 17 38 46 - 93 0 0 18 45 17 1 36 14 28 86 -19 19 20 54 18 9 45 19 41 36 17 49 10 - 92 0 0 18 55 34 1 36 10 29 87 -20 19 31 11 18 20 3 19 51 52 17 59 29 - 91 0 0 19 5 44 1 36 5 30 87 -21 19 41 20 18 30 13 20 2 1 18 9 40 - 90 0 0 19 15 47 1 36 0 31 88 -22 19 51 22 18 40 17 20 12 3 18 19 44 - 89 0 0 19 25 43 1 35 56 31 88 -23 20 1 17 18 50 13 20 21 58 18 29 40 - 88 0 0 19 35 31 1 35 51 32 88 -24 20 11 5 19 0 2 20 31 45 18 39 30 - 87 0 0 19 45 12 1 35 46 33 89 -25 20 20 45 19 9 43 20 41 24 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Uncertainty in time = +/- 5 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 0833-01136-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 10 27.3362 DE: +11 34 31.261 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .018 ) * V mag [mag]: 8.5 * B mag [mag]: 9.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (469) Argentina approx. diameter [km]: 126 approx. diameter ["]: .103 distance from Earth [AU]: 1.69400 * orbital information: orbit source: Preston date of fit: 2008 Jan 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 741 number of rejected observations: 75 time covered by the observations: 1907 Apr 04 - 2007 Nov 18 1 sigma uncertainty ellipse (major, minor, PA): 0.039, 0.018, 123° remarks: * orbital elements for (469) Argentina : Mean anomaly = 340.82897656 deg Arg. of pericenter = 206.13793879 deg Long. of node = 334.34631717 deg Inclination = 11.70243712 deg Eccentricity = 0.16783287 Semimajor axis = 3.16715924 AU Perihelion dist = 2.63560583 AU Mag: H = 8.62, G = 0.15 Epoch of elements : MJD 54524.06200000 TDT (2008 Feb 28.062) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 28 469 Argentina 1h 28.3m UT 8.5 10 10 27.336 11 34 31.26TYC 0833-01136-1 9.1 12.2 126 10.9 1.694 -2.294 0.29 -26.7271 11.576 161.11 -8.26 1.4721 0.00176 0.22377 -6.49435 0.05655 0.00075 -0.00031 2000 340.1186812008 224.00000206.137939334.346317 11.7024370.16783287 3.1671592 2.6356058 8.6 5.00.15 RATE 1.7486360 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.025 116 1.29 0.029 0 54510.5020080228_1136-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 02:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org