IOTA/IOTA-ES occultation update for (469) Argentina / TYC 2407-01861-1 event on 2012 Aug 16, 01:49 UT Visible from Africa, Arabia Summary ------- On 2012 Aug 16 UT, the 123 km diameter asteroid (469) Argentina will occult a 9.2 mag star in the constellation Auriga for observers along a path across Africa, Arabia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 14.9 mag (the magnitude of the asteroid) for at most 4.0 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: 94 * date and approx. time of event: 2012 Aug 16, 01:45 - 2012 Aug 16, 01:47 UT * geocentric midpoint of event [JD]: 2456155.57595833 * magnitude of target star: 9.2 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 4.0 * Moon: 3 % sunlit, 42° distance * Sun: 61° distance * rough path description: Africa, Arabia The occultation path -------------------- * approximate projected width [km]: 123 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .023 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .023", .021", 90° ) * approx speed of asteroid's shadow [km/s]: 30.4616 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2407-01861-1 by 469 Argentina on 2012 Aug 16 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 9 0 0 -10 50 8 1 45 55 1 56 -56 -11 30 38 -10 9 39 .. .. .. - 9 33 14 10 0 0 -10 9 21 1 45 55 2 55 -55 -10 49 55 - 9 28 49 -11 26 28 - 8 52 21 11 0 0 - 9 28 19 1 45 55 3 55 -54 -10 8 57 - 8 47 44 -10 45 32 - 8 11 13 12 0 0 - 8 47 3 1 45 55 4 55 -53 - 9 27 44 - 8 6 25 -10 4 22 - 7 29 52 13 0 0 - 8 5 34 1 45 55 5 55 -52 - 8 46 17 - 7 24 53 - 9 22 57 - 6 48 18 14 0 0 - 7 23 54 1 45 56 7 55 -51 - 8 4 39 - 6 43 11 - 8 41 21 - 6 6 33 15 0 0 - 6 42 3 1 45 56 8 55 -50 - 7 22 50 - 6 1 18 - 7 59 34 - 5 24 39 16 0 0 - 6 0 4 1 45 57 9 55 -49 - 6 40 53 - 5 19 18 - 7 17 38 - 4 42 37 17 0 0 - 5 17 58 1 45 58 10 54 -47 - 5 58 47 - 4 37 11 - 6 35 34 - 4 0 29 18 0 0 - 4 35 46 1 45 59 11 54 -46 - 5 16 36 - 3 54 58 - 5 53 23 - 3 18 16 19 0 0 - 3 53 31 1 46 0 13 54 -45 - 4 34 21 - 3 12 42 - 5 11 8 - 2 36 0 20 0 0 - 3 11 12 1 46 1 14 54 -44 - 3 52 3 - 2 30 24 - 4 28 50 - 1 53 42 21 0 0 - 2 28 53 1 46 2 15 54 -43 - 3 9 43 - 1 48 5 - 3 46 30 - 1 11 23 22 0 0 - 1 46 35 1 46 3 16 54 -42 - 2 27 24 - 1 5 47 - 3 4 10 - 0 29 6 23 0 0 - 1 4 18 1 46 4 18 54 -40 - 1 45 6 - 0 23 32 - 2 21 51 0 13 8 24 0 0 - 0 22 6 1 46 6 19 54 -39 - 1 2 52 0 18 39 - 1 39 36 0 55 18 25 0 0 0 20 2 1 46 7 20 54 -38 - 0 20 43 1 0 44 - 0 57 25 1 37 21 26 0 0 1 2 2 1 46 9 21 54 -37 0 21 20 1 42 42 - 0 15 20 2 19 17 27 0 0 1 43 54 1 46 10 22 54 -36 1 3 15 2 24 32 0 26 37 3 1 4 28 0 0 2 25 37 1 46 12 24 54 -35 1 45 0 3 6 11 1 8 25 3 42 41 29 0 0 3 7 7 1 46 14 25 54 -33 2 26 34 3 47 39 1 50 3 4 24 5 30 0 0 3 48 26 1 46 16 26 54 -32 3 7 56 4 28 53 2 31 28 5 5 17 31 0 0 4 29 29 1 46 18 27 54 -31 3 49 4 5 9 53 3 12 39 5 46 13 32 0 0 5 10 18 1 46 20 29 54 -30 4 29 57 5 50 37 3 53 36 6 26 53 33 0 0 5 50 49 1 46 22 30 54 -29 5 10 32 6 31 3 4 34 16 7 7 15 34 0 0 6 31 2 1 46 24 31 54 -28 5 50 50 7 11 11 5 14 38 7 47 19 35 0 0 7 10 55 1 46 27 32 55 -26 6 30 49 7 50 59 5 54 41 8 27 2 36 0 0 7 50 28 1 46 29 33 55 -25 7 10 27 8 30 26 6 34 24 9 6 24 37 0 0 8 29 38 1 46 31 35 55 -24 7 49 43 9 9 31 7 13 46 9 45 23 38 0 0 9 8 25 1 46 34 36 55 -23 8 28 36 9 48 12 7 52 45 10 23 59 39 0 0 9 46 48 1 46 37 37 55 -22 9 7 6 10 26 29 8 31 20 11 2 10 40 0 0 10 24 46 1 46 39 38 55 -21 9 45 10 11 4 20 9 9 30 11 39 55 41 0 0 11 2 17 1 46 42 39 55 -20 10 22 48 11 41 45 9 47 14 12 17 14 42 0 0 11 39 21 1 46 45 40 55 -18 10 59 59 12 18 42 10 24 31 12 54 5 43 0 0 12 15 57 1 46 47 42 56 -17 11 36 42 12 55 11 11 1 21 13 30 28 44 0 0 12 52 4 1 46 50 43 56 -16 12 12 57 13 31 11 11 37 42 14 6 21 45 0 0 13 27 42 1 46 53 44 56 -15 12 48 41 14 6 40 12 13 33 14 41 44 46 0 0 14 2 48 1 46 56 45 56 -14 13 23 55 14 41 39 12 48 54 15 16 36 47 0 0 14 37 24 1 46 59 46 56 -13 13 58 39 15 16 7 13 23 44 15 50 57 48 0 0 15 11 27 1 47 2 47 56 -12 14 32 50 15 50 3 13 58 2 16 24 46 49 0 0 15 44 59 1 47 5 48 57 -11 15 6 29 16 23 26 14 31 49 16 58 2 50 0 0 16 17 57 1 47 8 49 57 -9 15 39 35 16 56 16 15 5 2 17 30 45 51 0 0 16 50 21 1 47 11 51 57 -8 16 12 8 17 28 33 15 37 42 18 2 54 52 0 0 17 22 12 1 47 14 52 57 -7 16 44 7 18 0 16 16 9 48 18 34 30 53 0 0 17 53 29 1 47 18 53 57 -6 17 15 31 18 31 24 16 41 20 19 5 31 54 0 0 18 24 10 1 47 21 54 58 -5 17 46 21 19 1 57 17 12 17 19 35 57 55 0 0 18 54 17 1 47 24 55 58 -4 18 16 36 19 31 56 17 42 40 20 5 48 56 0 0 19 23 48 1 47 27 56 58 -3 18 46 16 20 1 19 18 12 27 20 35 4 57 0 0 19 52 44 1 47 31 57 58 -2 19 15 20 20 30 7 18 41 38 21 3 44 58 0 0 20 21 4 1 47 34 58 58 -1 19 43 48 20 58 19 19 10 14 21 31 49 Uncertainty in time = +/- 2 secs Prediction of 2012 Jun 21.0 Data for the target star ------------------------ * name: TYC 2407-01861-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 28 44.8777 DE: +33 37 05.742 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .018 ) * V mag [mag]: 9.2 * B mag [mag]: 10.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (469) Argentina approx. diameter [km]: 123 approx. diameter ["]: .046 distance from Earth [AU]: 3.70300 * orbital information: orbit source: Preston date of fit: 2012 Jun 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1039 number of rejected observations: 75 time covered by the observations: 1907 Apr 04 - 2012 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.010, 90° remarks: * orbital elements for (469) Argentina : Mean anomaly = 263.03066133 deg Arg. of pericenter = 208.50859152 deg Long. of node = 333.63975361 deg Inclination = 11.58141048 deg Eccentricity = 0.16000607 Semimajor axis = 3.18577378 AU Perihelion dist = 2.67603064 AU Mag: H = 8.62, G = 0.15 Epoch of elements : MJD 56155.07600000 TDT (2012 Aug 16.076) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 16 469 Argentina 1h 49.4m UT 9.2 5 28 44.878 33 37 5.74TYC 2407-01861-1 10.1 14.9 123 4.0 3.703 3.220 6.98 89.9757 33.616 153.73 13.65 1.8230 0.00693 -0.06058 16.93995 2.94101 -0.00499 0.00025 2000 262.1508222012 811.00000208.508592333.639754 11.5814100.16000607 3.1857738 2.6760306 8.6 5.00.15 RATE 1.7333320 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.023 0.021 90 1.45 0.021 0 0-3 2 056099.0020120816_1861-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 21, 01:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org