IOTA/IOTA-ES occultation update for (1107) Lictoria / 2UCAC 39315576 event on 2008 Mar 01, 22:26 UT Visible from Africa Summary ------- On 2008 Mar 01 UT, the 79 km diameter asteroid (1107) Lictoria will occult a 12.2 mag star in the constellation Leo for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.5 mag to 13.4 mag (the magnitude of the asteroid) for at most 8.5 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: 91 * date and approx. time of event: 2008 Mar 01, 22:14 - 2008 Mar 01, 22:36 UT * magnitude of target star: 12.2 * magnitude drop [mag]: 1.5 * estimated maximum duration [s]: 8.5 * Moon: 33 % sunlit, 134° distance * Sun: 155° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 0.50 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .028", 98° ) * approx speed of asteroid's shadow [km/s]: 9.3303 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 39315576 by 1107 Lictoria on 2008 Mar 1 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 - 71 0 0 35 19 40 22 36 22 25 81 0 35 41 36 34 57 44 36 3 34 34 35 49 - 70 0 0 35 29 47 22 36 18 26 81 -1 35 51 41 35 7 54 36 13 36 34 46 1 - 69 0 0 35 39 27 22 36 13 26 82 -2 36 1 19 35 17 36 36 23 12 34 55 45 - 68 0 0 35 48 40 22 36 9 27 82 -3 36 10 30 35 26 51 36 32 21 35 5 3 - 67 0 0 35 57 27 22 36 4 28 83 -3 36 19 15 35 35 40 36 41 4 35 13 53 - 66 0 0 36 5 47 22 36 0 29 84 -4 36 27 33 35 44 2 36 49 20 35 22 17 - 65 0 0 36 13 41 22 35 55 30 84 -5 36 35 25 35 51 57 36 57 10 35 30 14 - 64 0 0 36 21 8 22 35 50 30 85 -6 36 42 51 35 59 26 37 4 34 35 37 45 - 63 0 0 36 28 9 22 35 45 31 85 -7 36 49 50 36 6 29 37 11 32 35 44 50 - 62 0 0 36 34 44 22 35 40 32 86 -7 36 56 24 36 13 6 37 18 4 35 51 28 - 61 0 0 36 40 54 22 35 35 33 87 -8 37 2 32 36 19 16 37 24 11 35 57 40 - 60 0 0 36 46 37 22 35 30 34 87 -9 37 8 14 36 25 1 37 29 52 36 3 26 - 59 0 0 36 51 55 22 35 25 34 88 -10 37 13 31 36 30 20 37 35 7 36 8 46 - 58 0 0 36 56 47 22 35 19 35 88 -10 37 18 22 36 35 13 37 39 57 36 13 40 - 57 0 0 37 1 14 22 35 14 36 89 -11 37 22 47 36 39 41 37 44 22 36 18 9 - 56 0 0 37 5 15 22 35 8 37 90 -12 37 26 48 36 43 43 37 48 21 36 22 12 - 55 0 0 37 8 51 22 35 3 37 90 -13 37 30 23 36 47 20 37 51 55 36 25 50 - 54 0 0 37 12 2 22 34 57 38 91 -14 37 33 33 36 50 31 37 55 5 36 29 2 - 53 0 0 37 14 47 22 34 51 39 92 -14 37 36 18 36 53 17 37 57 49 36 31 49 - 52 0 0 37 17 8 22 34 45 40 92 -15 37 38 37 36 55 38 38 0 8 36 34 10 - 51 0 0 37 19 3 22 34 39 41 93 -16 37 40 32 36 57 34 38 2 3 36 36 6 - 50 0 0 37 20 33 22 34 33 41 94 -17 37 42 2 36 59 5 38 3 32 36 37 37 - 49 0 0 37 21 39 22 34 27 42 94 -17 37 43 8 37 0 10 38 4 37 36 38 43 - 48 0 0 37 22 19 22 34 21 43 95 -18 37 43 48 37 0 51 38 5 18 36 39 24 - 47 0 0 37 22 35 22 34 14 44 96 -19 37 44 3 37 1 7 38 5 33 36 39 39 - 46 0 0 37 22 25 22 34 8 44 96 -20 37 43 54 37 0 57 38 5 24 36 39 30 - 45 0 0 37 21 51 22 34 1 45 97 -21 37 43 20 37 0 23 38 4 50 36 38 55 - 44 0 0 37 20 52 22 33 55 46 98 -21 37 42 22 36 59 24 38 3 52 36 37 56 - 43 0 0 37 19 29 22 33 48 47 98 -22 37 40 58 36 58 0 38 2 29 36 36 32 - 42 0 0 37 17 40 22 33 41 47 99 -23 37 39 10 36 56 11 38 0 41 36 34 42 - 41 0 0 37 15 27 22 33 34 48 100 -24 37 36 58 36 53 57 37 58 29 36 32 28 - 40 0 0 37 12 49 22 33 27 49 100 -24 37 34 21 36 51 19 37 55 53 36 29 49 - 39 0 0 37 9 47 22 33 20 50 101 -25 37 31 19 36 48 15 37 52 52 36 26 45 - 38 0 0 37 6 19 22 33 13 51 102 -26 37 27 52 36 44 47 37 49 26 36 23 16 - 37 0 0 37 2 27 22 33 6 51 102 -27 37 24 1 36 40 54 37 45 35 36 19 21 - 36 0 0 36 58 10 22 32 58 52 103 -28 37 19 44 36 36 36 37 41 20 36 15 2 - 35 0 0 36 53 28 22 32 51 53 104 -28 37 15 4 36 31 52 37 36 40 36 10 18 - 34 0 0 36 48 21 22 32 43 54 105 -29 37 9 58 36 26 44 37 31 36 36 5 9 - 33 0 0 36 42 49 22 32 36 54 105 -30 37 4 27 36 21 11 37 26 7 35 59 35 - 32 0 0 36 36 52 22 32 28 55 106 -31 36 58 32 36 15 13 37 20 13 35 53 35 - 31 0 0 36 30 30 22 32 20 56 107 -31 36 52 12 36 8 50 37 13 54 35 47 10 - 30 0 0 36 23 44 22 32 12 57 107 -32 36 45 26 36 2 2 37 7 10 35 40 21 - 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0 23 38 59 0 0 - 0 8 52 22 16 55 36 297 -59 0 15 58 - 0 33 41 0 40 49 - 0 58 29 60 0 0 - 0 43 39 22 16 47 35 297 -58 - 0 18 50 - 1 8 26 0 6 0 - 1 33 13 61 0 0 - 1 18 16 22 16 40 33 297 -57 - 0 53 29 - 1 43 2 - 0 28 41 - 2 7 47 62 0 0 - 1 52 44 22 16 32 32 297 -56 - 1 27 59 - 2 17 28 - 1 3 12 - 2 42 12 63 0 0 - 2 27 1 22 16 25 31 297 -55 - 2 2 18 - 2 51 44 - 1 37 33 - 3 16 25 64 0 0 - 3 1 7 22 16 18 30 297 -54 - 2 36 25 - 3 25 47 - 2 11 43 - 3 50 27 65 0 0 - 3 34 59 22 16 12 29 297 -53 - 3 10 20 - 3 59 38 - 2 45 40 - 4 24 15 66 0 0 - 4 8 39 22 16 5 28 297 -51 - 3 44 2 - 4 33 15 - 3 19 23 - 4 57 50 67 0 0 - 4 42 3 22 15 59 27 297 -50 - 4 17 29 - 5 6 37 - 3 52 53 - 5 31 10 68 0 0 - 5 15 13 22 15 53 26 297 -49 - 4 50 41 - 5 39 44 - 4 26 8 - 6 4 15 69 0 0 - 5 48 7 22 15 48 25 296 -48 - 5 23 37 - 6 12 35 - 4 59 6 - 6 37 3 70 0 0 - 6 20 43 22 15 42 23 296 -47 - 5 56 16 - 6 45 9 - 5 31 48 - 7 9 34 71 0 0 - 6 53 2 22 15 37 22 296 -46 - 6 28 38 - 7 17 25 - 6 4 12 - 7 41 48 72 0 0 - 7 25 2 22 15 32 21 296 -45 - 7 0 41 - 7 49 22 - 6 36 18 - 8 13 42 73 0 0 - 7 56 43 22 15 28 20 296 -44 - 7 32 24 - 8 21 0 - 7 8 5 - 8 45 17 74 0 0 - 8 28 4 22 15 23 19 296 -43 - 8 3 48 - 8 52 18 - 7 39 32 - 9 16 32 75 0 0 - 8 59 4 22 15 19 18 296 -42 - 8 34 52 - 9 23 15 - 8 10 38 - 9 47 26 76 0 0 - 9 29 42 22 15 15 17 296 -41 - 9 5 33 - 9 53 51 - 8 41 23 -10 17 58 77 0 0 - 9 59 59 22 15 11 16 296 -39 - 9 35 53 -10 24 4 - 9 11 46 -10 48 8 78 0 0 -10 29 53 22 15 8 15 295 -38 -10 5 50 -10 53 54 - 9 41 47 -11 17 55 79 0 0 -10 59 23 22 15 5 14 295 -37 -10 35 24 -11 23 21 -10 11 24 -11 47 19 80 0 0 -11 28 30 22 15 2 12 295 -36 -11 4 34 -11 52 24 -10 40 37 -12 16 18 81 0 0 -11 57 12 22 14 59 11 295 -35 -11 33 19 -12 21 3 -11 9 26 -12 44 53 82 0 0 -12 25 29 22 14 57 10 295 -34 -12 1 40 -12 49 16 -11 37 50 -13 13 3 83 0 0 -12 53 20 22 14 55 9 294 -33 -12 29 35 -13 17 4 -12 5 49 -13 40 47 84 0 0 -13 20 45 22 14 53 8 294 -32 -12 57 4 -13 44 26 -12 33 21 -14 8 6 85 0 0 -13 47 44 22 14 51 7 294 -31 -13 24 6 -14 11 21 -13 0 27 -14 34 57 86 0 0 -14 14 16 22 14 50 6 294 -30 -13 50 42 -14 37 49 -13 27 7 -15 1 22 87 0 0 -14 40 21 22 14 48 5 293 -29 -14 16 50 -15 3 50 -13 53 19 -15 27 19 88 0 0 -15 5 58 22 14 47 4 293 -28 -14 42 31 -15 29 24 -14 19 3 -15 52 49 89 0 0 -15 31 6 22 14 47 3 293 -27 -15 7 43 -15 54 29 -14 44 19 -16 17 50 90 0 0 -15 55 47 22 14 46 2 293 -26 -15 32 28 -16 19 5 -15 9 7 -16 42 23 91 0 0 -16 19 59 22 14 46 1 292 -25 -15 56 43 -16 43 13 -15 33 26 -17 6 27 Uncertainty in time = +/- 6 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: 2UCAC 39315576 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 09 28 09.4569 DE: +21 15 26.706 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 12.2 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1107) Lictoria approx. diameter [km]: 79 approx. diameter ["]: .057 distance from Earth [AU]: 1.92600 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 843 number of rejected observations: 105 time covered by the observations: 1909 Oct 17 - 2008 Jan 31 1 sigma uncertainty ellipse (major, minor, PA): 0.031, 0.017, 102° remarks: * orbital elements for (1107) Lictoria : Mean anomaly = 32.54147619 deg Arg. of pericenter = 353.39813701 deg Long. of node = 110.99413846 deg Inclination = 7.06887157 deg Eccentricity = 0.12748356 Semimajor axis = 3.18108227 AU Perihelion dist = 2.77554656 AU Mag: H = 9.46, G = 0.15 Epoch of elements : MJD 54526.93500000 TDT (2008 Mar 01.935) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 1 1107 Lictoria 22h 26.1m UT 12.2 9 28 9.457 21 15 26.712UCAC 39315576 0.0 13.4 79 8.5 1.926 -1.575 9.63 5.4221 21.255 -153.47 -7.17 22.4350 0.04025 0.09354 -4.82513 2.10999 0.00207 -0.00128 2000 31.3367502008 224.00000353.398137110.994138 7.0688720.12748356 3.1810823 2.7755466 9.1 5.00.15 RATE 1.7371680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.028 98 1.50 0.028 0 54510.5020080301_315576 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 02:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org