IOTA/IOTA-ES occultation update for (147) Protogeneia / 2UCAC 22531679 event on 2008 Mar 01, 07:12 UT Visible from Argentina, Chile Summary ------- On 2008 Mar 01 UT, the 133 km diameter asteroid (147) Protogeneia will occult a 12.0 mag star in the constellation Sagittarius for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 14.3 mag (the magnitude of the asteroid) for at most 5.0 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: 88 * date and approx. time of event: 2008 Mar 01, 07:08 - 2008 Mar 01, 07:11 UT * magnitude of target star: 12.0 * magnitude drop [mag]: 2.4 * estimated maximum duration [s]: 5.0 * Moon: 38 % sunlit, 8° distance * Sun: 71° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 148 * 1 sigma uncertainty interval [path widths]: +/- 0.56 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .031", 90° ) * approx speed of asteroid's shadow [km/s]: 26.4631 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 22531679 by 147 Protogeneia 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 - 97 0 0 -25 15 1 7 8 59 1 115 -57 -25 59 48 -24 30 33 -26 50 21 -23 41 6 - 96 0 0 -25 41 32 7 8 59 2 115 -56 -26 26 20 -24 57 2 -27 16 54 -24 7 33 - 95 0 0 -26 8 0 7 8 59 3 115 -55 -26 52 49 -25 23 29 -27 43 24 -24 33 59 - 94 0 0 -26 34 26 7 9 0 4 114 -55 -27 19 16 -25 49 54 -28 9 52 -25 0 23 - 93 0 0 -27 0 49 7 9 0 5 114 -54 -27 45 40 -26 16 16 -28 36 17 -25 26 45 - 92 0 0 -27 27 8 7 9 0 6 113 -53 -28 11 59 -26 42 35 -29 2 37 -25 53 2 - 91 0 0 -27 53 22 7 9 1 7 113 -53 -28 38 14 -27 8 49 -29 28 52 -26 19 16 - 90 0 0 -28 19 31 7 9 2 8 112 -52 -29 4 23 -27 34 58 -29 55 1 -26 45 25 - 89 0 0 -28 45 34 7 9 2 9 112 -51 -29 30 26 -28 1 1 -30 21 4 -27 11 28 - 88 0 0 -29 11 31 7 9 3 10 111 -50 -29 56 22 -28 26 58 -30 47 0 -27 37 26 - 87 0 0 -29 37 20 7 9 4 11 111 -50 -30 22 11 -28 52 48 -31 12 48 -28 3 16 - 86 0 0 -30 3 1 7 9 5 12 110 -49 -30 47 52 -29 18 30 -31 38 28 -28 28 59 - 85 0 0 -30 28 34 7 9 6 13 110 -48 -31 13 24 -29 44 4 -32 3 59 -28 54 34 - 84 0 0 -30 53 58 7 9 7 14 109 -47 -31 38 46 -30 9 28 -32 29 20 -29 20 0 - 83 0 0 -31 19 12 7 9 8 14 109 -46 -32 3 59 -30 34 44 -32 54 31 -29 45 16 - 82 0 0 -31 44 16 7 9 9 15 108 -46 -32 29 1 -30 59 49 -33 19 31 -30 10 23 - 81 0 0 -32 9 8 7 9 10 16 108 -45 -32 53 52 -31 24 43 -33 44 20 -30 35 19 - 80 0 0 -32 33 49 7 9 11 17 107 -44 -33 18 31 -31 49 26 -34 8 57 -31 0 5 - 79 0 0 -32 58 19 7 9 13 18 106 -43 -33 42 58 -32 13 58 -34 33 22 -31 24 38 - 78 0 0 -33 22 35 7 9 14 19 106 -42 -34 7 12 -32 38 16 -34 57 33 -31 48 59 - 77 0 0 -33 46 39 7 9 16 20 105 -41 -34 31 13 -33 2 22 -35 21 31 -32 13 8 - 76 0 0 -34 10 29 7 9 17 21 105 -41 -34 55 0 -33 26 15 -35 45 15 -32 37 4 - 75 0 0 -34 34 5 7 9 19 22 104 -40 -35 18 33 -33 49 54 -36 8 45 -33 0 45 - 74 0 0 -34 57 26 7 9 20 23 103 -39 -35 41 52 -34 13 18 -36 32 0 -33 24 13 - 73 0 0 -35 20 33 7 9 22 24 103 -38 -36 4 55 -34 36 28 -36 55 0 -33 47 26 - 72 0 0 -35 43 24 7 9 24 25 102 -37 -36 27 43 -34 59 23 -37 17 44 -34 10 25 - 71 0 0 -36 5 59 7 9 25 25 101 -37 -36 50 15 -35 22 1 -37 40 12 -34 33 7 - 70 0 0 -36 28 19 7 9 27 26 101 -36 -37 12 31 -35 44 24 -38 2 23 -34 55 34 - 69 0 0 -36 50 22 7 9 29 27 100 -35 -37 34 30 -36 6 31 -38 24 18 -35 17 45 - 68 0 0 -37 12 8 7 9 31 28 99 -34 -37 56 12 -36 28 21 -38 45 55 -35 39 39 - 67 0 0 -37 33 37 7 9 33 29 98 -33 -38 17 37 -36 49 54 -39 7 16 -36 1 17 - 66 0 0 -37 54 48 7 9 35 30 98 -32 -38 38 44 -37 11 10 -39 28 18 -36 22 37 - 65 0 0 -38 15 42 7 9 37 31 97 -32 -38 59 34 -37 32 8 -39 49 3 -36 43 40 - 64 0 0 -38 36 18 7 9 39 31 96 -31 -39 20 5 -37 52 48 -40 9 29 -37 4 25 - 63 0 0 -38 56 36 7 9 41 32 95 -30 -39 40 18 -38 13 10 -40 29 37 -37 24 52 - 62 0 0 -39 16 35 7 9 43 33 95 -29 -40 0 13 -38 33 14 -40 49 26 -37 45 0 - 61 0 0 -39 36 16 7 9 46 34 94 -28 -40 19 49 -38 52 59 -41 8 57 -38 4 51 - 60 0 0 -39 55 37 7 9 48 35 93 -28 -40 39 6 -39 12 26 -41 28 8 -38 24 22 - 59 0 0 -40 14 40 7 9 50 35 92 -27 -40 58 3 -39 31 33 -41 47 0 -38 43 35 - 58 0 0 -40 33 23 7 9 52 36 91 -26 -41 16 42 -39 50 21 -42 5 33 -39 2 28 - 57 0 0 -40 51 47 7 9 55 37 90 -25 -41 35 1 -40 8 50 -42 23 46 -39 21 2 - 56 0 0 -41 9 51 7 9 57 38 89 -24 -41 53 0 -40 26 59 -42 41 40 -39 39 17 - 55 0 0 -41 27 36 7 9 59 38 89 -24 -42 10 40 -40 44 49 -42 59 14 -39 57 12 - 54 0 0 -41 45 1 7 10 2 39 88 -23 -42 28 0 -41 2 19 -43 16 28 -40 14 48 - 53 0 0 -42 2 6 7 10 4 40 87 -22 -42 45 0 -41 19 29 -43 33 22 -40 32 3 - 52 0 0 -42 18 51 7 10 7 41 86 -21 -43 1 40 -41 36 19 -43 49 56 -40 48 59 - 51 0 0 -42 35 17 7 10 9 41 85 -20 -43 18 0 -41 52 50 -44 6 10 -41 5 35 - 50 0 0 -42 51 22 7 10 11 42 84 -20 -43 34 0 -42 9 0 -44 22 4 -41 21 51 - 49 0 0 -43 7 7 7 10 14 43 83 -19 -43 49 39 -42 24 50 -44 37 38 -41 37 46 - 48 0 0 -43 22 31 7 10 16 43 82 -18 -44 4 59 -42 40 20 -44 52 52 -41 53 22 - 47 0 0 -43 37 36 7 10 19 44 81 -17 -44 19 58 -42 55 29 -45 7 45 -42 8 37 - 46 0 0 -43 52 20 7 10 21 45 80 -17 -44 34 38 -43 10 19 -45 22 18 -42 23 32 - 45 0 0 -44 6 44 7 10 24 45 79 -16 -44 48 56 -43 24 48 -45 36 32 -42 38 7 - 44 0 0 -44 20 48 7 10 27 46 78 -15 -45 2 55 -43 38 57 -45 50 25 -42 52 21 - 43 0 0 -44 34 32 7 10 29 47 76 -14 -45 16 34 -43 52 45 -46 3 57 -43 6 15 - 42 0 0 -44 47 55 7 10 32 47 75 -14 -45 29 52 -44 6 14 -46 17 10 -43 19 49 - 41 0 0 -45 0 58 7 10 34 48 74 -13 -45 42 50 -44 19 22 -46 30 3 -43 33 2 - 40 0 0 -45 13 41 7 10 37 49 73 -12 -45 55 29 -44 32 9 -46 42 35 -43 45 55 - 39 0 0 -45 26 4 7 10 40 49 72 -11 -46 7 46 -44 44 37 -46 54 48 -43 58 28 - 38 0 0 -45 38 7 7 10 42 50 71 -11 -46 19 44 -44 56 44 -47 6 40 -44 10 41 - 37 0 0 -45 49 49 7 10 45 51 69 -10 -46 31 22 -45 8 31 -47 18 12 -44 22 33 - 36 0 0 -46 1 12 7 10 47 51 68 -9 -46 42 40 -45 19 58 -47 29 25 -44 34 5 - 35 0 0 -46 12 14 7 10 50 52 67 -8 -46 53 38 -45 31 5 -47 40 18 -44 45 17 - 34 0 0 -46 22 57 7 10 53 52 65 -8 -47 4 16 -45 41 52 -47 50 51 -44 56 8 - 33 0 0 -46 33 20 7 10 55 53 64 -7 -47 14 34 -45 52 19 -48 1 4 -45 6 40 - 32 0 0 -46 43 22 7 10 58 53 63 -6 -47 24 33 -46 2 26 -48 10 58 -45 16 52 - 31 0 0 -46 53 5 7 11 1 54 61 -6 -47 34 12 -46 12 13 -48 20 32 -45 26 43 - 30 0 0 -47 2 29 7 11 3 54 60 -5 -47 43 31 -46 21 40 -48 29 46 -45 36 15 - 29 0 0 -47 11 32 7 11 6 55 59 -4 -47 52 30 -46 30 48 -48 38 41 -45 45 27 - 28 0 0 -47 20 16 7 11 9 55 57 -3 -48 1 10 -46 39 36 -48 47 17 -45 54 18 - 27 0 0 -47 28 40 7 11 12 56 56 -3 -48 9 31 -46 48 4 -48 55 33 -46 2 50 - 26 0 0 -47 36 45 7 11 14 56 54 -2 -48 17 32 -46 56 12 -49 3 30 -46 11 3 - 25 0 0 -47 44 30 7 11 17 57 53 -1 -48 25 14 -47 4 1 -49 11 8 -46 18 55 - 24 0 0 -47 51 56 7 11 20 57 51 -1 -48 32 36 -47 11 30 -49 18 26 -46 26 28 Uncertainty in time = +/- 3 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: 2UCAC 22531679 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 01 05.0888 DE: -23 18 09.067 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .029 ) * V mag [mag]: 12.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (147) Protogeneia approx. diameter [km]: 133 approx. diameter ["]: .055 distance from Earth [AU]: 3.34000 * orbital information: orbit source: Preston date of fit: 2008 Jan 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 881 number of rejected observations: 117 time covered by the observations: 1903 Aug 05 - 2007 Aug 14 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.010, 88° remarks: * orbital elements for (147) Protogeneia : Mean anomaly = 263.12684972 deg Arg. of pericenter = 104.92090580 deg Long. of node = 248.72537834 deg Inclination = 1.93470153 deg Eccentricity = 0.03331976 Semimajor axis = 3.13823334 AU Perihelion dist = 3.03366815 AU Mag: H = 8.55, G = 0.15 Epoch of elements : MJD 54526.30100000 TDT (2008 Mar 01.301) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 1 147 Protogeneia 7h 12.6m UT 12.0 18 1 5.089-23 18 9.072UCAC 22531679 0.0 14.3 133 5.0 3.340 2.854 0.99 2.6534 -23.303 74.93 -7.41 7.2101 0.01193 -0.43302 14.93176 0.37706 -0.00561 0.00000 2000 262.0097662008 224.00000104.920906248.725378 1.9347020.03331976 3.1382333 3.0336682 8.3 5.00.15 RATE 1.7728680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.031 90 1.56 0.031 0 54510.5020080301_531679 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 02:26 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org