IOTA/IOTA-ES occultation update for (147) Protogeneia / TYC 6842-01891-1 event on 2008 Mar 04, 21:59 UT Visible from Indonesia Summary ------- On 2008 Mar 04 UT, the 133 km diameter asteroid (147) Protogeneia will occult a 9.7 mag star in the constellation Sagittarius for observers along a path across Indonesia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.6 mag to 14.3 mag (the magnitude of the asteroid) for at most 5.3 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: 95 * date and approx. time of event: 2008 Mar 04, 21:55 - 2008 Mar 04, 21:58 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 4.6 * estimated maximum duration [s]: 5.3 * Moon: 9 % sunlit, 38° distance * Sun: 73° distance * rough path description: Indonesia Additional comments ------------------- close double star The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.43 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .024", 89° ) * approx speed of asteroid's shadow [km/s]: 25.1133 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6842-01891-1 by 147 Protogeneia on 2008 Mar 4 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 55 0 0 10 52 36 21 55 21 1 114 -69 10 12 7 11 33 13 9 37 24 12 8 15 56 0 0 10 26 35 21 55 21 2 114 -68 9 46 7 11 7 10 9 11 25 11 42 11 57 0 0 10 0 38 21 55 21 3 114 -67 9 20 12 10 41 12 8 45 31 11 16 11 58 0 0 9 34 45 21 55 21 4 114 -66 8 54 21 10 15 17 8 19 41 10 50 15 59 0 0 9 8 57 21 55 21 5 115 -65 8 28 35 9 49 28 7 53 57 10 24 24 60 0 0 8 43 15 21 55 22 6 115 -64 8 2 54 9 23 44 7 28 18 9 58 38 61 0 0 8 17 40 21 55 22 7 115 -63 7 37 21 8 58 6 7 2 46 9 32 59 62 0 0 7 52 11 21 55 23 8 115 -62 7 11 54 8 32 35 6 37 22 9 7 27 63 0 0 7 26 50 21 55 24 9 115 -61 6 46 36 8 7 12 6 12 5 8 42 1 64 0 0 7 1 38 21 55 25 10 115 -60 6 21 26 7 41 57 5 46 57 8 16 44 65 0 0 6 36 34 21 55 26 11 115 -59 5 56 25 7 16 51 5 21 58 7 51 36 66 0 0 6 11 40 21 55 27 13 116 -58 5 31 33 6 51 55 4 57 9 7 26 38 67 0 0 5 46 57 21 55 28 14 116 -57 5 6 52 6 27 9 4 32 30 7 1 49 68 0 0 5 22 24 21 55 29 15 116 -56 4 42 22 6 2 33 4 8 2 6 37 11 69 0 0 4 58 3 21 55 30 16 116 -55 4 18 4 5 38 9 3 43 46 6 12 44 70 0 0 4 33 53 21 55 32 17 116 -54 3 53 57 5 13 56 3 19 43 5 48 29 71 0 0 4 9 56 21 55 33 18 116 -53 3 30 4 4 49 56 2 55 51 5 24 27 72 0 0 3 46 13 21 55 35 19 116 -52 3 6 23 4 26 10 2 32 14 5 0 37 73 0 0 3 22 43 21 55 36 20 116 -51 2 42 57 4 2 37 2 8 50 4 37 1 74 0 0 2 59 27 21 55 38 21 116 -50 2 19 44 3 39 18 1 45 40 4 13 39 75 0 0 2 36 27 21 55 40 22 116 -49 1 56 47 3 16 14 1 22 46 3 50 32 76 0 0 2 13 41 21 55 42 23 117 -48 1 34 5 2 53 25 1 0 7 3 27 41 77 0 0 1 51 12 21 55 44 24 117 -47 1 11 39 2 30 52 0 37 43 3 5 4 78 0 0 1 28 58 21 55 46 25 117 -46 0 49 29 2 8 35 0 15 37 2 42 45 79 0 0 1 7 2 21 55 48 26 117 -45 0 27 36 1 46 35 - 0 6 13 2 20 41 80 0 0 0 45 23 21 55 50 28 117 -44 0 6 0 1 24 52 - 0 27 46 1 58 55 81 0 0 0 24 1 21 55 52 29 117 -43 - 0 15 17 1 3 27 - 0 49 1 1 37 27 82 0 0 0 2 58 21 55 55 30 117 -42 - 0 36 17 0 42 20 - 1 9 57 1 16 17 83 0 0 - 0 17 47 21 55 57 31 117 -41 - 0 56 58 0 21 31 - 1 30 35 0 55 25 84 0 0 - 0 38 13 21 56 0 32 117 -40 - 1 17 20 0 1 2 - 1 50 54 0 34 52 85 0 0 - 0 58 19 21 56 2 33 117 -38 - 1 37 23 - 0 19 8 - 2 10 53 0 14 39 86 0 0 - 1 18 6 21 56 5 34 117 -37 - 1 57 6 - 0 38 59 - 2 30 33 - 0 5 15 87 0 0 - 1 37 32 21 56 8 35 118 -36 - 2 16 29 - 0 58 29 - 2 49 53 - 0 24 48 88 0 0 - 1 56 38 21 56 11 36 118 -35 - 2 35 31 - 1 17 39 - 3 8 52 - 0 44 1 89 0 0 - 2 15 23 21 56 14 37 118 -34 - 2 54 12 - 1 36 28 - 3 27 30 - 1 2 53 90 0 0 - 2 33 48 21 56 16 38 118 -33 - 3 12 33 - 1 54 56 - 3 45 47 - 1 21 24 91 0 0 - 2 51 50 21 56 19 39 118 -32 - 3 30 32 - 2 13 2 - 4 3 43 - 1 39 34 92 0 0 - 3 9 31 21 56 23 40 118 -31 - 3 48 9 - 2 30 46 - 4 21 17 - 1 57 22 93 0 0 - 3 26 50 21 56 26 41 118 -30 - 4 5 24 - 2 48 9 - 4 38 29 - 2 14 47 94 0 0 - 3 43 46 21 56 29 42 118 -29 - 4 22 17 - 3 5 9 - 4 55 19 - 2 31 51 95 0 0 - 4 0 20 21 56 32 43 119 -28 - 4 38 47 - 3 21 46 - 5 11 46 - 2 48 31 96 0 0 - 4 16 31 21 56 35 44 119 -27 - 4 54 54 - 3 38 1 - 5 27 50 - 3 4 49 97 0 0 - 4 32 19 21 56 39 45 119 -26 - 5 10 39 - 3 53 52 - 5 43 31 - 3 20 43 98 0 0 - 4 47 43 21 56 42 46 119 -25 - 5 26 0 - 4 9 20 - 5 58 50 - 3 36 15 99 0 0 - 5 2 44 21 56 46 47 119 -24 - 5 40 57 - 4 24 25 - 6 13 44 - 3 51 22 100 0 0 - 5 17 22 21 56 49 48 119 -23 - 5 55 31 - 4 39 6 - 6 28 15 - 4 6 6 101 0 0 - 5 31 35 21 56 53 49 120 -22 - 6 9 41 - 4 53 23 - 6 42 23 - 4 20 25 102 0 0 - 5 45 25 21 56 56 50 120 -21 - 6 23 27 - 5 7 15 - 6 56 6 - 4 34 21 103 0 0 - 5 58 50 21 57 0 51 120 -20 - 6 36 49 - 5 20 43 - 7 9 25 - 4 47 52 104 0 0 - 6 11 50 21 57 4 52 121 -19 - 6 49 47 - 5 33 47 - 7 22 20 - 5 0 58 105 0 0 - 6 24 26 21 57 7 53 121 -18 - 7 2 20 - 5 46 26 - 7 34 50 - 5 13 40 106 0 0 - 6 36 37 21 57 11 54 121 -17 - 7 14 28 - 5 58 40 - 7 46 56 - 5 25 57 107 0 0 - 6 48 24 21 57 15 55 122 -16 - 7 26 11 - 6 10 29 - 7 58 37 - 5 37 48 108 0 0 - 6 59 45 21 57 19 56 122 -15 - 7 37 30 - 6 21 54 - 8 9 53 - 5 49 15 109 0 0 - 7 10 41 21 57 23 57 123 -14 - 7 48 23 - 6 32 53 - 8 20 44 - 6 0 16 110 0 0 - 7 21 12 21 57 27 58 123 -13 - 7 58 51 - 6 43 26 - 8 31 10 - 6 10 52 111 0 0 - 7 31 17 21 57 31 59 124 -12 - 8 8 54 - 6 53 34 - 8 41 11 - 6 21 2 112 0 0 - 7 40 57 21 57 35 60 124 -11 - 8 18 32 - 7 3 17 - 8 50 46 - 6 30 47 113 0 0 - 7 50 12 21 57 39 61 125 -9 - 8 27 44 - 7 12 34 - 8 59 56 - 6 40 6 114 0 0 - 7 59 1 21 57 43 62 126 -8 - 8 36 31 - 7 21 25 - 9 8 41 - 6 48 59 115 0 0 - 8 7 24 21 57 47 62 126 -7 - 8 44 52 - 7 29 50 - 9 17 0 - 6 57 26 116 0 0 - 8 15 21 21 57 51 63 127 -6 - 8 52 47 - 7 37 49 - 9 24 53 - 7 5 28 117 0 0 - 8 22 53 21 57 55 64 128 -5 - 9 0 16 - 7 45 23 - 9 32 21 - 7 13 3 118 0 0 - 8 29 58 21 57 59 65 129 -4 - 9 7 20 - 7 52 30 - 9 39 23 - 7 20 12 119 0 0 - 8 36 37 21 58 4 66 130 -3 - 9 13 57 - 7 59 11 - 9 45 59 - 7 26 54 120 0 0 - 8 42 51 21 58 8 67 131 -2 - 9 20 9 - 8 5 26 - 9 52 10 - 7 33 11 121 0 0 - 8 48 38 21 58 12 68 132 -1 - 9 25 55 - 8 11 15 - 9 57 54 - 7 39 1 122 0 0 - 8 53 59 21 58 16 68 134 0 - 9 31 15 - 8 16 38 -10 3 12 - 7 44 25 Uncertainty in time = +/- 3 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: TYC 6842-01891-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 05 08.2516 DE: -23 16 31.756 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 9.7 * B mag [mag]: 10.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (147) Protogeneia approx. diameter [km]: 133 approx. diameter ["]: .056 distance from Earth [AU]: 3.29000 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 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, 87° remarks: * orbital elements for (147) Protogeneia : Mean anomaly = 263.80105077 deg Arg. of pericenter = 104.88702789 deg Long. of node = 248.72532836 deg Inclination = 1.93468055 deg Eccentricity = 0.03331132 Semimajor axis = 3.13829762 AU Perihelion dist = 3.03375677 AU Mag: H = 8.55, G = 0.15 Epoch of elements : MJD 54529.91600000 TDT (2008 Mar 04.916) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 4 147 Protogeneia 21h 59.5m UT 9.7 18 5 8.252-23 16 31.76TYC 6842-01891-1 10.2 14.3 133 5.3 3.290 2.748 1.29 138.3908 -23.276 -146.97 -6.02 21.9908 -0.00817 0.24201 14.16649 0.48102 -0.00571 -0.00005 2000 262.0431302008 224.00000104.887028248.725328 1.9346810.03331132 3.1382976 3.0337568 8.3 5.00.15 RATE 1.7728130 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.024 89 1.43 0.024 0 54523.5020080304_1891-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org