IOTA/IOTA-ES occultation update for (1213) Algeria / HIP 113978 event on 2008 May 14, 21:23 UT Visible from Russia Summary ------- On 2008 May 14 UT, the 33 km diameter asteroid (1213) Algeria will occult a 8.8 mag star in the constellation Pisces for observers along a path across Russia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.7 mag to 16.5 mag (the magnitude of the asteroid) for at most 1.1 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: . The event at a glimpse ---------------------- * Rank: 31 * date and approx. time of event: 2008 May 14, 21:22 - 2008 May 14, 21:24 UT * midpoint of event [JD]: 2454601.39153333 * magnitude of target star: 8.8 * magnitude drop [mag]: 7.7 * estimated maximum duration [s]: 1.1 * Moon: 76 % sunlit, 169° distance * Sun: 65° distance * rough path description: Russia The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 2.17 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .042 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .031", 77° ) * approx speed of asteroid's shadow [km/s]: 31.2873 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 113978 by 1213 Algeria on 2008 May 14 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 63 8 9 38 6 40 21 22 44 4 86 -29 ... .. .. .. .. .. 65 25 16 38 9 49 ... .. .. .. .. .. 71 13 49 38 0 45 65 29 10 38 40 5 21 22 46 5 88 -27 63 13 29 38 37 8 67 10 46 38 39 53 ... .. .. .. .. .. 72 17 51 38 26 44 67 11 39 39 10 1 21 22 47 7 89 -26 65 29 31 39 10 14 68 37 0 39 8 15 ... .. .. .. .. .. 73 16 45 38 52 20 68 35 57 39 38 21 21 22 49 8 90 -25 67 9 41 39 40 6 69 51 31 39 35 37 ... .. .. .. .. .. 74 11 30 39 17 37 69 49 4 40 5 44 21 22 51 9 91 -24 68 32 26 40 8 26 70 57 58 40 2 19 ... .. .. .. .. .. 75 2 50 39 42 40 70 54 21 40 32 28 21 22 52 10 91 -23 69 44 20 40 35 51 71 58 23 40 28 33 61 27 14 40 32 44 75 51 16 40 7 32 71 53 46 40 58 46 21 22 54 10 92 -23 70 48 36 41 2 40 72 54 3 40 54 27 64 8 16 41 8 47 76 37 12 40 32 16 72 48 33 41 24 44 21 22 56 11 93 -22 71 47 8 41 29 2 73 45 52 41 20 4 65 54 39 41 39 52 77 20 57 40 56 53 73 39 33 41 50 27 21 22 57 12 93 -21 72 41 6 41 55 5 74 34 28 41 45 30 67 19 31 42 9 5 78 2 46 41 21 26 74 27 24 42 15 59 21 22 59 12 94 -20 73 31 21 42 20 54 75 20 19 42 10 47 68 31 54 42 37 14 78 42 52 41 45 54 75 12 32 42 41 21 21 23 1 13 95 -20 74 18 28 42 46 32 76 3 47 42 35 56 69 35 48 43 4 43 79 21 24 42 10 20 75 55 18 43 6 38 21 23 3 13 95 -19 75 2 55 43 12 1 76 45 9 43 1 1 70 33 26 43 31 44 79 58 31 42 34 44 76 36 0 43 31 49 21 23 4 14 96 -19 75 45 1 43 37 25 77 24 38 43 26 2 71 26 11 43 58 25 80 34 20 42 59 7 77 14 50 43 56 57 21 23 6 14 96 -18 76 25 3 44 2 44 78 2 26 43 51 0 72 14 57 44 24 51 81 8 56 43 23 31 77 51 59 44 22 3 21 23 8 15 97 -17 77 3 14 44 28 0 78 38 42 44 15 57 73 0 25 44 51 7 81 42 26 43 47 54 78 27 37 44 47 8 21 23 9 15 97 -17 77 39 45 44 53 14 79 13 34 44 40 53 73 43 2 45 17 15 82 14 54 44 12 19 79 1 50 45 12 13 21 23 11 15 98 -16 78 14 44 45 18 27 79 47 8 45 5 50 74 23 11 45 43 16 82 46 23 44 36 46 79 34 45 45 37 18 21 23 13 16 99 -16 78 48 18 45 43 41 80 19 29 45 30 47 75 1 8 46 9 15 83 16 57 45 1 14 80 6 28 46 2 25 21 23 14 16 99 -15 79 20 34 46 8 55 80 50 43 45 55 46 75 37 7 46 35 10 83 46 39 45 25 46 80 37 3 46 27 33 21 23 16 16 100 -14 79 51 37 46 34 11 81 20 53 46 20 48 76 11 18 47 1 5 84 15 32 45 50 20 81 6 34 46 52 44 21 23 18 16 100 -14 80 21 32 46 59 29 81 50 3 46 45 52 76 43 51 47 27 0 84 43 37 46 14 59 81 35 4 47 17 59 21 23 20 17 101 -13 80 50 21 47 24 50 82 18 16 47 11 0 77 14 53 47 52 56 85 10 58 46 39 41 82 2 36 47 43 17 21 23 21 17 101 -13 81 18 9 47 50 15 82 45 34 47 36 12 77 44 30 48 18 54 85 37 35 47 4 27 82 29 12 48 8 39 21 23 23 17 102 -12 81 44 58 48 15 44 83 12 0 48 1 28 78 12 47 48 44 54 86 3 30 47 29 19 82 54 56 48 34 6 21 23 25 17 102 -12 82 10 51 48 41 17 83 37 36 48 26 49 78 39 48 49 10 57 86 28 45 47 54 15 83 19 47 48 59 38 21 23 26 18 102 -11 82 35 49 49 6 55 84 2 22 48 52 15 79 5 36 49 37 5 86 53 20 48 19 17 83 43 49 49 25 16 21 23 28 18 103 -11 82 59 54 49 32 39 84 26 21 49 17 47 79 30 14 50 3 17 87 17 17 48 44 25 84 7 2 49 50 59 21 23 30 18 103 -10 83 23 7 49 58 28 84 49 34 49 43 25 79 53 45 50 29 35 87 40 37 49 9 39 84 29 27 50 16 49 21 23 31 18 104 -10 83 45 30 50 24 24 85 12 2 50 9 9 80 16 11 50 55 58 88 3 20 49 35 0 84 51 4 50 42 46 21 23 33 18 104 -9 84 7 3 50 50 27 85 33 45 50 35 1 80 37 32 51 22 27 88 25 26 50 0 28 85 11 56 51 8 51 21 23 35 18 105 -9 84 27 48 51 16 37 85 54 43 51 0 59 80 57 50 51 49 4 88 46 57 50 26 3 85 32 1 51 35 3 21 23 37 18 105 -8 84 47 43 51 42 55 86 14 58 51 27 6 81 17 6 52 15 47 89 7 53 50 51 46 85 51 20 52 1 23 21 23 38 18 106 -8 85 6 50 52 9 20 86 34 29 51 53 20 81 35 19 52 42 38 89 28 13 51 17 38 86 9 53 52 27 52 21 23 40 18 106 -8 85 25 8 52 35 55 86 53 16 52 19 43 81 52 30 53 9 38 89 47 57 51 43 37 86 27 40 52 54 29 21 23 42 19 106 -7 85 42 38 53 2 38 87 11 20 52 46 16 82 8 38 53 36 46 90 7 7 52 9 46 86 44 40 53 21 17 21 23 43 19 107 -7 85 59 18 53 29 31 87 28 39 53 12 57 82 23 43 54 4 4 90 25 41 52 36 4 87 0 52 53 48 14 21 23 45 19 107 -6 86 15 8 53 56 34 87 45 13 53 39 49 82 37 44 54 31 31 90 43 39 53 2 31 87 16 17 54 15 21 21 23 47 19 107 -6 86 30 8 54 23 47 88 1 2 54 6 51 82 50 39 54 59 8 91 1 0 53 29 9 87 30 52 54 42 39 21 23 48 19 108 -5 86 44 15 54 51 11 88 16 4 54 34 3 83 2 27 55 26 56 91 17 45 53 55 57 87 44 37 55 10 9 21 23 50 19 108 -5 86 57 29 55 18 46 88 30 18 55 1 27 83 13 5 55 54 55 91 33 52 54 22 56 87 57 30 55 37 50 21 23 52 19 109 -5 87 9 48 55 46 33 88 43 44 55 29 2 83 22 32 56 23 6 91 49 20 54 50 7 88 9 29 56 5 43 21 23 54 19 109 -4 87 21 10 56 14 32 88 56 18 55 56 50 83 30 44 56 51 29 92 4 8 55 17 29 88 20 33 56 33 50 21 23 55 18 109 -4 87 31 32 56 42 44 89 8 0 56 24 51 83 37 38 57 20 5 92 18 16 55 45 4 88 30 38 57 2 9 21 23 57 18 109 -3 87 40 53 57 11 9 89 18 47 56 53 4 83 43 10 57 48 54 92 31 41 56 12 52 88 39 42 57 30 43 21 23 59 18 110 -3 87 49 9 57 39 48 89 28 37 57 21 32 83 47 15 58 17 57 92 44 23 56 40 53 88 47 43 57 59 30 21 24 0 18 110 -3 87 56 17 58 8 42 89 37 27 57 50 14 83 49 49 58 47 13 92 56 18 57 9 8 88 54 36 58 28 33 21 24 2 18 110 -2 88 2 12 58 37 51 89 45 14 58 19 10 83 50 45 59 16 45 93 7 25 57 37 38 89 0 18 58 57 52 21 24 4 18 111 -2 88 6 52 59 7 15 89 51 54 58 48 23 83 49 58 59 46 32 93 17 42 58 6 22 89 4 43 59 27 26 21 24 5 18 111 -1 88 10 10 59 36 55 89 57 23 59 17 51 83 47 18 60 16 35 93 27 5 58 35 23 89 7 48 59 57 18 21 24 7 18 111 -1 88 12 0 60 6 53 90 1 37 59 47 37 83 42 38 60 46 54 93 35 32 59 4 40 89 9 25 60 27 27 21 24 9 18 111 -1 88 12 18 60 37 8 90 4 30 60 17 40 83 35 48 61 17 31 93 42 59 59 34 14 89 9 30 60 57 54 21 24 11 17 111 0 88 10 55 61 7 41 90 5 55 60 48 1 83 26 35 61 48 24 93 49 22 60 4 6 89 7 53 61 28 41 21 24 12 17 111 0 88 7 42 61 38 34 90 5 47 61 18 41 83 14 46 62 19 36 93 54 37 60 34 17 Uncertainty in time = +/- 3 secs [Prediction of 2008 Apr 9.0] Data for the target star ------------------------ * name: HIP 113978 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 04 59.2576 DE: +05 11 46.137 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .032, .022 ) * V mag [mag]: 8.8 * B mag [mag]: 9.4 * Apparent position with proper motion RA(deg): 346.3533216362 DE(deg): 5.2401225075 * Equation of equinoxes (radians) : 0.000040415811135 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1213) Algeria approx. diameter [km]: 33 approx. diameter ["]: .015 distance from Earth [AU]: 3.10700 * orbital information: orbit source: Preston date of fit: 2008 Feb 16 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): 0.030, 0.022, 63° remarks: * orbital elements for (1213) Algeria : Mean anomaly = 322.71202868 deg Arg. of pericenter = 106.47252278 deg Long. of node = 271.82306188 deg Inclination = 13.08125420 deg Eccentricity = 0.12832559 Semimajor axis = 3.13573624 AU Perihelion dist = 2.73334104 AU Mag: H = 10.94, G = 0.15 Epoch of elements : MJD 54600.89100000 TDT (2008 May 14.891) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 14 1213 Algeria 21h 23.8m UT 8.8 23 4 59.258 5 11 46.14HIP 113978 9.4 16.5 33 1.1 3.107 2.782 27.78 152.3083 5.189 -141.86 18.88 21.3968 -0.52432 0.78677 14.68295 9.81156 -0.00485 -0.00162 2000 322.5538782008 514.00000106.472523271.823062 13.0812540.12832559 3.1357362 2.733341010.8 5.00.15 RATE 1.7749850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.031 77 3.17 0.032 0 54565.5020080514_113978 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 09, 17:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org