IOTA/IOTA-ES occultation update for (599) Luisa / 2UCAC 18985174 event on 2008 Mar 26, 23:07 UT Visible from S Africa Summary ------- On 2008 Mar 26 UT, the 65 km diameter asteroid (599) Luisa will occult a 12.3 mag star in the constellation Sagittarius for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.6 mag (the magnitude of the asteroid) for at most 3.6 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: 65 * date and approx. time of event: 2008 Mar 26, 23:02 - 2008 Mar 26, 23:09 UT * midpoint of event [JD]: 2454552.46352917 * magnitude of target star: 12.3 * magnitude drop [mag]: 1.6 * estimated maximum duration [s]: 3.6 * Moon: 76 % sunlit, 25° distance * Sun: 97° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.92 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .043", .036", 93° ) * approx speed of asteroid's shadow [km/s]: 17.7849 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 18985174 by 599 Luisa on 2008 Mar 26 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 4 0 0 -10 13 18 23 2 46 1 121 -76 -10 39 52 - 9 46 55 -11 29 17 .. .. .. 5 0 0 -10 50 25 23 2 46 2 121 -77 -11 17 13 -10 23 50 -12 7 3 .. .. .. 6 0 0 -11 28 32 23 2 46 3 121 -77 -11 55 34 -11 1 43 -12 45 49 .. .. .. 7 0 0 -12 7 39 23 2 47 4 121 -77 -12 34 55 -11 40 36 -13 25 37 .. .. .. 8 0 0 -12 47 46 23 2 48 5 120 -77 -13 15 16 -12 20 28 -14 6 26 .. .. .. 9 0 0 -13 28 52 23 2 49 6 120 -77 -13 56 37 -13 1 20 -14 48 16 -12 11 13 10 0 0 -14 10 58 23 2 50 8 120 -77 -14 38 58 -13 43 11 -15 31 7 -12 52 37 11 0 0 -14 54 3 23 2 51 9 120 -77 -15 22 19 -14 26 1 -16 14 58 -13 34 59 12 0 0 -15 38 7 23 2 53 10 119 -77 -16 6 40 -15 9 49 -16 59 49 -14 18 19 13 0 0 -16 23 10 23 2 55 11 119 -76 -16 51 59 -15 54 35 -17 45 40 -15 2 37 14 0 0 -17 9 10 23 2 57 12 119 -75 -17 38 16 -16 40 19 -18 32 30 -15 47 51 15 0 0 -17 56 8 23 2 59 14 118 -75 -18 25 32 -17 27 0 -19 20 18 -16 34 2 16 0 0 -18 44 3 23 3 1 15 118 -74 -19 13 44 -18 14 38 -20 9 4 -17 21 9 17 0 0 -19 32 53 23 3 4 16 118 -73 -20 2 52 -19 3 10 -20 58 47 -18 9 10 18 0 0 -20 22 38 23 3 7 17 117 -72 -20 52 56 -19 52 37 -21 49 26 -18 58 5 19 0 0 -21 13 17 23 3 10 19 117 -71 -21 43 53 -20 42 57 -22 41 0 -19 47 53 20 0 0 -22 4 48 23 3 13 20 116 -70 -22 35 44 -21 34 10 -23 33 27 -20 38 32 21 0 0 -22 57 10 23 3 17 21 116 -69 -23 28 25 -22 26 13 -24 26 45 -21 30 1 22 0 0 -23 50 21 23 3 21 22 115 -68 -24 21 55 -23 19 4 -25 20 54 -22 22 19 23 0 0 -24 44 19 23 3 25 23 114 -67 -25 16 14 -24 12 44 -26 15 51 -23 15 24 24 0 0 -25 39 3 23 3 29 25 114 -66 -26 11 18 -25 7 8 -27 11 34 -24 9 14 25 0 0 -26 34 30 23 3 33 26 113 -64 -27 7 6 -26 2 15 -28 8 0 -25 3 47 26 0 0 -27 30 39 23 3 38 27 112 -63 -28 3 35 -26 58 4 -29 5 9 -25 59 0 27 0 0 -28 27 26 23 3 43 28 112 -62 -29 0 42 -27 54 31 -30 2 56 -26 54 52 28 0 0 -29 24 48 23 3 48 29 111 -61 -29 58 25 -28 51 34 -31 1 19 -27 51 19 29 0 0 -30 22 44 23 3 53 31 110 -59 -30 56 41 -29 49 9 -32 0 15 -28 48 20 30 0 0 -31 21 9 23 3 58 32 109 -58 -31 55 27 -30 47 15 -32 59 41 -29 45 50 31 0 0 -32 20 1 23 4 4 33 108 -57 -32 54 40 -31 45 47 -33 59 33 -30 43 48 32 0 0 -33 19 16 23 4 9 34 107 -56 -33 54 15 -32 44 42 -34 59 47 -31 42 9 33 0 0 -34 18 50 23 4 15 35 106 -54 -34 54 9 -33 43 57 -36 0 20 -32 40 50 34 0 0 -35 18 40 23 4 21 36 105 -53 -35 54 18 -34 43 28 -37 1 7 -33 39 47 35 0 0 -36 18 41 23 4 28 37 104 -52 -36 54 39 -35 43 11 -38 2 5 -34 38 58 36 0 0 -37 18 50 23 4 34 38 103 -50 -37 55 7 -36 43 1 -39 3 9 -35 38 17 37 0 0 -38 19 2 23 4 40 39 101 -49 -38 55 37 -37 42 56 -40 4 15 -36 37 41 38 0 0 -39 19 13 23 4 47 40 100 -48 -39 56 5 -38 42 50 -41 5 17 -37 37 6 39 0 0 -40 19 19 23 4 53 41 99 -47 -40 56 27 -39 42 39 -42 6 12 -38 36 27 40 0 0 -41 19 14 23 5 0 42 97 -45 -41 56 39 -40 42 20 -43 6 54 -39 35 40 41 0 0 -42 18 55 23 5 7 43 96 -44 -42 56 35 -41 41 46 -44 7 19 -40 34 41 42 0 0 -43 18 16 23 5 14 44 94 -43 -43 56 10 -42 40 54 -45 7 22 -41 33 26 43 0 0 -44 17 15 23 5 21 45 92 -42 -44 55 21 -43 39 40 -46 6 58 -42 31 50 44 0 0 -45 15 45 23 5 27 45 91 -40 -45 54 3 -44 37 59 -47 6 3 -43 29 50 45 0 0 -46 13 42 23 5 34 46 89 -39 -46 52 11 -45 35 46 -48 4 32 -44 27 20 46 0 0 -47 11 3 23 5 41 47 87 -38 -47 49 41 -46 32 59 -49 2 20 -45 24 17 47 0 0 -48 7 44 23 5 48 47 86 -37 -48 46 30 -47 29 32 -49 59 23 -46 20 36 48 0 0 -49 3 39 23 5 55 48 84 -36 -49 42 32 -48 25 21 -50 55 38 -47 16 15 49 0 0 -49 58 47 23 6 1 48 82 -35 -50 37 44 -49 20 24 -51 51 0 -48 11 9 50 0 0 -50 53 2 23 6 8 49 80 -33 -51 32 3 -50 14 36 -52 45 25 -49 5 16 51 0 0 -51 46 22 23 6 15 49 78 -32 -52 25 25 -51 7 54 -53 38 51 -49 58 31 52 0 0 -52 38 45 23 6 21 50 76 -31 -53 17 48 -52 0 16 -54 31 15 -50 50 52 53 0 0 -53 30 6 23 6 28 50 74 -30 -54 9 8 -52 51 38 -55 22 33 -51 42 16 54 0 0 -54 20 24 23 6 34 50 72 -29 -54 59 23 -53 41 59 -56 12 43 -52 32 41 55 0 0 -55 9 37 23 6 40 51 70 -28 -55 48 32 -54 31 16 -57 1 44 -53 22 4 56 0 0 -55 57 43 23 6 46 51 68 -27 -56 36 32 -55 19 27 -57 49 33 -54 10 24 57 0 0 -56 44 40 23 6 52 51 66 -26 -57 23 22 -56 6 30 -58 36 9 -54 57 40 58 0 0 -57 30 27 23 6 58 51 64 -25 -58 9 1 -56 52 25 -59 21 31 -55 43 49 59 0 0 -58 15 3 23 7 4 52 62 -25 -58 53 28 -57 37 11 -60 5 39 -56 28 50 60 0 0 -58 58 28 23 7 10 52 60 -24 -59 36 41 -58 20 46 -60 48 32 -57 12 44 61 0 0 -59 40 41 23 7 15 52 58 -23 -60 18 42 -59 3 11 -61 30 9 -57 55 29 62 0 0 -60 21 42 23 7 20 52 56 -22 -60 59 30 -59 44 25 -62 10 31 -58 37 4 63 0 0 -61 1 32 23 7 26 52 54 -21 -61 39 6 -60 24 28 -62 49 39 -59 17 31 64 0 0 -61 40 10 23 7 31 52 52 -20 -62 17 29 -61 3 20 -63 27 32 -59 56 49 65 0 0 -62 17 37 23 7 36 52 50 -20 -62 54 40 -61 41 3 -64 4 12 -60 34 59 66 0 0 -62 53 54 23 7 40 52 48 -19 -63 30 40 -62 17 37 -64 39 40 -61 12 0 67 0 0 -63 29 2 23 7 45 52 46 -18 -64 5 31 -62 53 1 -65 13 56 -61 47 55 68 0 0 -64 3 2 23 7 50 52 44 -18 -64 39 13 -63 27 19 -65 47 3 -62 22 43 69 0 0 -64 35 55 23 7 54 52 43 -17 -65 11 47 -64 0 30 -66 19 1 -62 56 25 70 0 0 -65 7 43 23 7 58 51 41 -16 -65 43 16 -64 32 36 -66 49 52 -63 29 3 71 0 0 -65 38 26 23 8 2 51 39 -16 -66 13 40 -65 3 38 -67 19 39 -64 0 39 72 0 0 -66 8 7 23 8 6 51 37 -15 -66 43 1 -65 33 38 -67 48 21 -64 31 12 73 0 0 -66 36 47 23 8 10 51 36 -14 -67 11 20 -66 2 37 -68 16 2 -65 0 45 74 0 0 -67 4 27 23 8 14 51 34 -14 -67 38 40 -66 30 36 -68 42 43 -65 29 18 75 0 0 -67 31 9 23 8 18 51 32 -13 -68 5 2 -66 57 38 -69 8 25 -65 56 55 76 0 0 -67 56 54 23 8 21 51 31 -13 -68 30 27 -67 23 43 -69 33 12 -66 23 35 77 0 0 -68 21 45 23 8 25 50 29 -12 -68 54 58 -67 48 54 -69 57 3 -66 49 20 78 0 0 -68 45 43 23 8 28 50 28 -12 -69 18 36 -68 13 12 -70 20 2 -67 14 13 79 0 0 -69 8 50 23 8 31 50 26 -11 -69 41 22 -68 36 38 -70 42 9 -67 38 14 80 0 0 -69 31 7 23 8 35 50 24 -11 -70 3 19 -68 59 15 -71 3 27 -68 1 25 81 0 0 -69 52 36 23 8 38 50 23 -10 -70 24 28 -69 21 3 -71 23 58 -68 23 47 82 0 0 -70 13 18 23 8 41 49 21 -10 -70 44 50 -69 42 4 -71 43 43 -68 45 22 83 0 0 -70 33 15 23 8 43 49 20 -9 -71 4 28 -70 2 20 -72 2 43 -69 6 12 84 0 0 -70 52 29 23 8 46 49 19 -9 -71 23 23 -70 21 53 -72 21 1 -69 26 18 85 0 0 -71 11 1 23 8 49 49 17 -9 -71 41 36 -70 40 43 -72 38 37 -69 45 41 86 0 0 -71 28 52 23 8 52 49 16 -8 -71 59 8 -70 58 53 -72 55 34 -70 4 22 87 0 0 -71 46 4 23 8 54 48 14 -8 -72 16 2 -71 16 23 -73 11 53 -70 22 24 88 0 0 -72 2 39 23 8 57 48 13 -7 -72 32 18 -71 33 15 -73 27 35 -70 39 47 89 0 0 -72 18 37 23 8 59 48 12 -7 -72 47 59 -71 49 30 -73 42 42 -70 56 33 90 0 0 -72 33 59 23 9 1 48 10 -7 -73 3 4 -72 5 9 -73 57 14 -71 12 42 91 0 0 -72 48 48 23 9 4 48 9 -6 -73 17 36 -72 20 14 -74 11 13 -71 28 17 92 0 0 -73 3 4 23 9 6 47 8 -6 -73 31 35 -72 34 47 -74 24 41 -71 43 18 93 0 0 -73 16 48 23 9 8 47 6 -6 -73 45 3 -72 48 47 -74 37 39 -71 57 46 94 0 0 -73 30 2 23 9 10 47 5 -5 -73 58 1 -73 2 16 -74 50 6 -72 11 43 95 0 0 -73 42 46 23 9 12 47 4 -5 -74 10 30 -73 15 15 -75 2 6 -72 25 9 96 0 0 -73 55 2 23 9 14 47 2 -5 -74 22 31 -73 27 46 -75 13 38 -72 38 6 97 0 0 -74 6 50 23 9 16 47 1 -4 -74 34 4 -73 39 48 -75 24 44 -72 50 34 98 0 0 -74 18 12 23 9 18 46 360 -4 -74 45 12 -73 51 24 -75 35 24 -73 2 34 99 0 0 -74 29 8 23 9 20 46 359 -4 -74 55 54 -74 2 33 -75 45 40 -73 14 8 100 0 0 -74 39 39 23 9 22 46 357 -4 -75 6 11 -74 13 18 -75 55 32 -73 25 16 101 0 0 -74 49 46 23 9 24 46 356 -3 -75 16 5 -74 23 37 -76 5 1 -73 35 59 102 0 0 -74 59 30 23 9 26 46 355 -3 -75 25 37 -74 33 34 -76 14 8 -73 46 17 103 0 0 -75 8 51 23 9 27 45 354 -3 -75 34 46 -74 43 7 -76 22 54 -73 56 12 104 0 0 -75 17 50 23 9 29 45 352 -3 -75 43 33 -74 52 18 -76 31 19 -74 5 44 105 0 0 -75 26 29 23 9 31 45 351 -2 -75 52 0 -75 1 8 -76 39 24 -74 14 54 106 0 0 -75 34 47 23 9 32 45 350 -2 -76 0 7 -75 9 37 -76 47 10 -74 23 43 107 0 0 -75 42 45 23 9 34 45 349 -2 -76 7 54 -75 17 45 -76 54 36 -74 32 11 108 0 0 -75 50 24 23 9 35 45 348 -2 -76 15 22 -75 25 34 -77 1 45 -74 40 18 109 0 0 -75 57 44 23 9 37 44 346 -1 -76 22 32 -75 33 4 -77 8 36 -74 48 6 110 0 0 -76 4 45 23 9 38 44 345 -1 -76 29 24 -75 40 16 -77 15 10 -74 55 34 111 0 0 -76 11 30 23 9 40 44 344 -1 -76 35 59 -75 47 9 -77 21 27 -75 2 44 112 0 0 -76 17 57 23 9 41 44 343 -1 -76 42 17 -75 53 45 -77 27 28 -75 9 36 113 0 0 -76 24 7 23 9 43 44 342 0 -76 48 19 -76 0 4 -77 33 13 -75 16 10 114 0 0 -76 30 1 23 9 44 44 340 0 -76 54 4 -76 6 6 -77 38 43 -75 22 27 115 0 0 -76 35 39 23 9 46 43 339 0 -76 59 35 -76 11 52 -77 43 58 -75 28 27 Uncertainty in time = +/- 4 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: 2UCAC 18985174 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 59 04.9419 DE: -30 44 30.298 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .037, .034 ) * V mag [mag]: 12.3 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 269.9069499719 DE(deg): -30.7434004957 * Equation of equinoxes (radians) : 0.000040643914936 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (599) Luisa approx. diameter [km]: 65 approx. diameter ["]: .040 distance from Earth [AU]: 2.21600 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 868 number of rejected observations: 55 time covered by the observations: 1906 Apr 29 - 2007 Jul 25 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.013, 102° remarks: * orbital elements for (599) Luisa : Mean anomaly = 303.14161924 deg Arg. of pericenter = 292.84508357 deg Long. of node = 44.68643162 deg Inclination = 16.66720739 deg Eccentricity = 0.29381188 Semimajor axis = 2.77202993 AU Perihelion dist = 1.95757460 AU Mag: H = 8.80, G = 0.15 Epoch of elements : MJD 54551.96400000 TDT (2008 Mar 26.964) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 26 599 Luisa 23h 7.5m UT 12.3 17 59 4.942-30 44 30.302UCAC 18985174 0.0 13.6 65 3.6 2.216 2.769 -17.71 98.1384 -30.737 -165.51 2.65 23.1247 -0.27231 -0.55022 8.99305 -4.46015 -0.00563 0.00009 2000 302.7221992008 325.00000292.845084 44.686432 16.6672070.29381188 2.7720299 1.9575746 8.7 5.00.15 RATE 2.1355380 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.043 0.036 93 1.92 0.037 0 54510.5020080326_985174 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 19:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org