IOTA/IOTA-ES occultation update for (1213) Algeria / TYC 1871-00369-1 event on 2009 Aug 09, 03:39 UT Visible from Summary ------- On 2009 Aug 09 UT, the 33 km diameter asteroid (1213) Algeria will occult a 10.0 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.6 mag (the magnitude of the asteroid) for at most 0.9 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: 31 * date and approx. time of event: 2009 Aug 09, 03:36 - 2009 Aug 09, 03:37 UT * magnitude of target star: 10.0 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 0.9 * Moon: 91 % sunlit, 97° distance * Sun: 48° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 2.19 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .028", 98° ) * approx speed of asteroid's shadow [km/s]: 36.0556 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1871-00369-1 by 1213 Algeria on 2009 Aug 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 - 26 0 0 24 34 14 3 36 52 1 61 -42 24 22 58 24 45 31 .. .. .. 25 35 11 - 25 0 0 25 5 45 3 36 52 2 61 -41 24 54 29 25 17 3 .. .. .. 26 6 44 - 24 0 0 25 37 11 3 36 52 3 61 -40 25 25 55 25 48 29 .. .. .. 26 38 11 - 23 0 0 26 8 31 3 36 52 4 62 -39 25 57 14 26 19 49 .. .. .. 27 9 31 - 22 0 0 26 39 44 3 36 52 5 62 -38 26 28 27 26 51 2 25 39 16 27 40 45 - 21 0 0 27 10 49 3 36 53 6 63 -37 26 59 32 27 22 7 26 10 21 28 11 49 - 20 0 0 27 41 45 3 36 53 7 63 -36 27 30 29 27 53 3 26 41 18 28 42 45 - 19 0 0 28 12 32 3 36 54 8 64 -35 28 1 15 28 23 50 27 12 5 29 13 31 - 18 0 0 28 43 8 3 36 54 9 64 -34 28 31 52 28 54 25 27 42 43 29 44 6 - 17 0 0 29 13 33 3 36 55 10 65 -33 29 2 17 29 24 50 28 13 9 30 14 29 - 16 0 0 29 43 45 3 36 55 11 65 -32 29 32 30 29 55 2 28 43 23 30 44 39 - 15 0 0 30 13 45 3 36 56 12 66 -31 30 2 30 30 25 1 29 13 25 31 14 36 - 14 0 0 30 43 31 3 36 57 13 66 -30 30 32 16 30 54 47 29 43 14 31 44 20 - 13 0 0 31 13 3 3 36 58 14 67 -29 31 1 48 31 24 18 30 12 49 32 13 48 - 12 0 0 31 42 19 3 36 58 15 67 -29 31 31 5 31 53 33 30 42 9 32 43 1 - 11 0 0 32 11 19 3 36 59 16 68 -28 32 0 7 32 22 33 31 11 13 33 11 57 - 10 0 0 32 40 3 3 37 0 17 68 -27 32 28 52 32 51 16 31 40 1 33 40 37 - 9 0 0 33 8 30 3 37 1 18 69 -26 32 57 19 33 19 43 32 8 32 34 9 0 - 8 0 0 33 36 40 3 37 2 19 70 -25 33 25 29 33 47 51 32 36 46 34 37 4 - 7 0 0 34 4 30 3 37 3 20 70 -24 33 53 21 34 15 41 33 4 42 35 4 49 - 6 0 0 34 32 2 3 37 4 21 71 -23 34 20 54 34 43 12 33 32 20 35 32 16 - 5 0 0 34 59 15 3 37 6 22 72 -22 34 48 8 35 10 23 33 59 38 35 59 23 - 4 0 0 35 26 8 3 37 7 23 72 -21 35 15 2 35 37 15 34 26 36 36 26 9 - 3 0 0 35 52 40 3 37 8 24 73 -20 35 41 35 36 3 46 34 53 15 36 52 35 - 2 0 0 36 18 51 3 37 9 25 73 -19 36 7 48 36 29 56 35 19 33 37 18 40 - 1 0 0 36 44 42 3 37 11 25 74 -18 36 33 39 36 55 45 35 45 30 37 44 23 0 0 0 37 10 10 3 37 12 26 75 -17 36 59 9 37 21 13 36 11 6 38 9 45 1 0 0 37 35 17 3 37 13 27 76 -17 37 24 18 37 46 18 36 36 20 38 34 44 2 0 0 38 0 2 3 37 15 28 76 -16 37 49 3 38 11 1 37 1 12 38 59 21 3 0 0 38 24 24 3 37 16 29 77 -15 38 13 27 38 35 22 37 25 41 39 23 36 4 0 0 38 48 23 3 37 18 30 78 -14 38 37 28 38 59 19 37 49 48 39 47 27 5 0 0 39 11 59 3 37 19 31 79 -13 39 1 5 39 22 54 38 13 32 40 10 55 6 0 0 39 35 12 3 37 21 32 79 -12 39 24 19 39 46 5 38 36 53 40 33 59 7 0 0 39 58 1 3 37 22 32 80 -11 39 47 10 40 8 53 38 59 51 40 56 40 8 0 0 40 20 27 3 37 24 33 81 -10 40 9 37 40 31 17 39 22 25 41 18 57 9 0 0 40 42 28 3 37 25 34 82 -10 40 31 41 40 53 17 39 44 35 41 40 50 10 0 0 41 4 6 3 37 27 35 83 -9 40 53 20 41 14 53 40 6 21 42 2 19 11 0 0 41 25 20 3 37 29 36 83 -8 41 14 35 41 36 5 40 27 43 42 23 24 12 0 0 41 46 9 3 37 30 36 84 -7 41 35 26 41 56 53 40 48 42 42 44 4 13 0 0 42 6 35 3 37 32 37 85 -6 41 55 53 42 17 17 41 9 16 43 4 21 14 0 0 42 26 36 3 37 34 38 86 -5 42 15 56 42 37 16 41 29 25 43 24 13 15 0 0 42 46 12 3 37 35 39 87 -5 42 35 34 42 56 51 41 49 11 43 43 40 16 0 0 43 5 24 3 37 37 39 88 -4 42 54 48 43 16 2 42 8 32 44 2 43 17 0 0 43 24 12 3 37 39 40 89 -3 43 13 38 43 34 48 42 27 29 44 21 22 18 0 0 43 42 36 3 37 40 41 90 -2 43 32 3 43 53 10 42 46 1 44 39 36 19 0 0 44 0 35 3 37 42 42 91 -1 43 50 4 44 11 7 43 4 9 44 57 26 20 0 0 44 18 10 3 37 44 42 92 -1 44 7 40 44 28 40 43 21 53 45 14 52 Uncertainty in time = +/- 2 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 1871-00369-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 51 55.4116 DE: +27 01 57.957 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .024 ) * V mag [mag]: 10.0 * B mag [mag]: 10.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1213) Algeria approx. diameter [km]: 33 approx. diameter ["]: .013 distance from Earth [AU]: 3.43800 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 565 number of rejected observations: 20 time covered by the observations: 1931 Nov 16 - 2007 Jul 20 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.015, 102° remarks: * orbital elements for (1213) Algeria : Mean anomaly = 42.68214246 deg Arg. of pericenter = 106.63599394 deg Long. of node = 271.82283723 deg Inclination = 13.08055132 deg Eccentricity = 0.12835875 Semimajor axis = 3.13580274 AU Perihelion dist = 2.73329504 AU Mag: H = 10.94, G = 0.15 Epoch of elements : MJD 55052.15200000 TDT (2009 Aug 09.152) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 9 1213 Algeria 3h 39.6m UT 10.0 5 51 55.412 27 1 57.96TYC 1871-00369-1 10.4 16.6 33 0.9 3.438 3.889 -3.29 75.3172 27.034 126.50 15.83 3.6594 0.02604 0.39722 20.31017 -1.28474 -0.00416 0.00017 2000 42.3001772009 8 7.00000106.635994271.822837 13.0805510.12835875 3.1358027 2.733295010.8 5.00.15 RATE 1.7749290 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.028 98 3.19 0.029 0 54581.5020090809_0369-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 07:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org