IOTA/IOTA-ES occultation update for (147) Protogeneia / TYC 6842-01353-1 event on 2008 Mar 06, 01:03 UT Visible from Arabia Summary ------- On 2008 Mar 06 UT, the 133 km diameter asteroid (147) Protogeneia will occult a 12.1 mag star in the constellation Sagittarius for observers along a path across Arabia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.3 mag to 14.3 mag (the magnitude of the asteroid) for at most 5.4 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: 93 * date and approx. time of event: 2008 Mar 06, 00:59 - 2008 Mar 06, 01:02 UT * magnitude of target star: 12.1 * magnitude drop [mag]: 2.3 * estimated maximum duration [s]: 5.4 * Moon: 3 % sunlit, 53° distance * Sun: 74° distance * rough path description: Arabia The occultation path -------------------- * approximate projected width [km]: 160 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .027", 360° ) * approx speed of asteroid's shadow [km/s]: 24.6844 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6842-01353-1 by 147 Protogeneia on 2008 Mar 6 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 17 0 0 28 38 26 0 59 44 1 117 -54 27 50 21 29 27 1 27 4 38 .. .. .. 18 0 0 28 11 50 0 59 44 2 118 -54 27 23 49 29 0 21 26 38 10 29 47 25 19 0 0 27 45 19 0 59 44 3 118 -53 26 57 23 28 33 46 26 11 48 29 20 45 20 0 0 27 18 56 0 59 44 4 119 -53 26 31 4 28 7 18 25 45 33 28 54 13 21 0 0 26 52 40 0 59 44 5 119 -52 26 4 52 27 40 57 25 19 26 28 27 47 22 0 0 26 26 32 0 59 45 6 119 -51 25 38 49 27 14 44 24 53 28 28 1 29 23 0 0 26 0 33 0 59 46 7 120 -51 25 12 55 26 48 39 24 27 38 27 35 19 24 0 0 25 34 43 0 59 46 8 120 -50 24 47 11 26 22 45 24 1 59 27 9 20 25 0 0 25 9 4 0 59 47 9 121 -49 24 21 37 25 57 0 23 36 30 26 43 30 26 0 0 24 43 37 0 59 48 10 121 -49 23 56 15 25 31 27 23 11 12 26 17 51 27 0 0 24 18 21 0 59 49 11 122 -48 23 31 4 25 6 6 22 46 7 25 52 24 28 0 0 23 53 18 0 59 50 12 122 -47 23 6 7 24 40 57 22 21 14 25 27 10 29 0 0 23 28 28 0 59 51 13 122 -47 22 41 22 24 16 1 21 56 35 25 2 8 30 0 0 23 3 52 0 59 52 14 123 -46 22 16 52 23 51 19 21 32 10 24 37 21 31 0 0 22 39 30 0 59 54 15 123 -45 21 52 37 23 26 52 21 8 0 24 12 48 32 0 0 22 15 25 0 59 55 16 124 -44 21 28 36 23 2 40 20 44 6 23 48 30 33 0 0 21 51 35 0 59 56 17 124 -43 21 4 52 22 38 44 20 20 27 23 24 28 34 0 0 21 28 1 0 59 58 18 125 -43 20 41 25 22 15 5 19 57 5 23 0 43 35 0 0 21 4 45 1 0 0 19 125 -42 20 18 15 21 51 43 19 34 1 22 37 14 36 0 0 20 41 47 1 0 2 20 126 -41 19 55 23 21 28 39 19 11 14 22 14 4 37 0 0 20 19 8 1 0 3 21 126 -40 19 32 49 21 5 53 18 48 46 21 51 12 38 0 0 19 56 47 1 0 5 22 126 -39 19 10 34 20 43 26 18 26 37 21 28 39 39 0 0 19 34 46 1 0 7 23 127 -38 18 48 39 20 21 19 18 4 47 21 6 26 40 0 0 19 13 5 1 0 10 23 127 -37 18 27 5 19 59 32 17 43 18 20 44 33 41 0 0 18 51 45 1 0 12 24 128 -37 18 5 50 19 38 6 17 22 9 20 23 1 42 0 0 18 30 46 1 0 14 25 128 -36 17 44 57 19 17 1 17 1 22 20 1 50 43 0 0 18 10 9 1 0 17 26 129 -35 17 24 26 18 56 17 16 40 56 19 41 0 44 0 0 17 49 54 1 0 19 27 129 -34 17 4 17 18 35 56 16 20 52 19 20 33 45 0 0 17 30 1 1 0 22 28 130 -33 16 44 30 18 15 58 16 1 11 19 0 29 46 0 0 17 10 32 1 0 24 29 130 -32 16 25 6 17 56 22 15 41 53 18 40 48 47 0 0 16 51 26 1 0 27 30 131 -31 16 6 6 17 37 11 15 22 58 18 21 30 48 0 0 16 32 44 1 0 30 31 131 -30 15 47 30 17 18 23 15 4 27 18 2 37 49 0 0 16 14 27 1 0 33 32 132 -29 15 29 18 17 0 0 14 46 21 17 44 8 50 0 0 15 56 34 1 0 36 33 132 -28 15 11 31 16 42 1 14 28 38 17 26 4 51 0 0 15 39 6 1 0 39 34 133 -27 14 54 9 16 24 28 14 11 21 17 8 25 52 0 0 15 22 4 1 0 42 35 134 -26 14 37 12 16 7 20 13 54 29 16 51 12 53 0 0 15 5 28 1 0 45 36 134 -25 14 20 41 15 50 39 13 38 3 16 34 25 54 0 0 14 49 17 1 0 48 37 135 -24 14 4 36 15 34 23 13 22 3 16 18 5 55 0 0 14 33 34 1 0 52 37 135 -23 13 48 57 15 18 34 13 6 29 16 2 10 56 0 0 14 18 17 1 0 55 38 136 -22 13 33 45 15 3 12 12 51 21 15 46 43 57 0 0 14 3 27 1 0 58 39 137 -21 13 19 0 14 48 17 12 36 41 15 31 44 58 0 0 13 49 4 1 1 2 40 137 -20 13 4 42 14 33 50 12 22 27 15 17 11 59 0 0 13 35 9 1 1 5 41 138 -19 12 50 51 14 19 50 12 8 41 15 3 7 60 0 0 13 21 42 1 1 9 42 139 -18 12 37 28 14 6 18 11 55 22 14 49 31 61 0 0 13 8 42 1 1 13 42 140 -17 12 24 34 13 53 15 11 42 32 14 36 23 62 0 0 12 56 11 1 1 17 43 140 -16 12 12 7 13 40 39 11 30 9 14 23 43 63 0 0 12 44 9 1 1 20 44 141 -15 12 0 8 13 28 33 11 18 14 14 11 33 64 0 0 12 32 35 1 1 24 45 142 -14 11 48 38 13 16 55 11 6 48 13 59 51 65 0 0 12 21 30 1 1 28 46 143 -13 11 37 37 13 5 46 10 55 50 13 48 38 66 0 0 12 10 55 1 1 32 46 144 -12 11 27 5 12 55 7 10 45 21 13 37 55 67 0 0 12 0 48 1 1 36 47 145 -11 11 17 2 12 44 57 10 35 21 13 27 42 68 0 0 11 51 11 1 1 40 48 146 -10 11 7 28 12 35 16 10 25 51 13 17 58 69 0 0 11 42 3 1 1 44 48 147 -9 10 58 23 12 26 5 10 16 49 13 8 43 70 0 0 11 33 25 1 1 48 49 148 -8 10 49 48 12 17 24 10 8 17 12 59 59 71 0 0 11 25 17 1 1 52 50 149 -7 10 41 43 12 9 13 10 0 14 12 51 45 72 0 0 11 17 38 1 1 56 50 150 -6 10 34 7 12 1 32 9 52 40 12 44 2 73 0 0 11 10 30 1 2 1 51 152 -5 10 27 1 11 54 21 9 45 37 12 36 48 74 0 0 11 3 52 1 2 5 51 153 -4 10 20 25 11 47 40 9 39 3 12 30 5 75 0 0 10 57 44 1 2 9 52 154 -3 10 14 19 11 41 30 9 32 59 12 23 53 76 0 0 10 52 6 1 2 13 52 155 -2 10 8 44 11 35 50 9 27 25 12 18 11 77 0 0 10 46 59 1 2 18 53 157 -1 10 3 38 11 30 41 9 22 22 12 13 0 78 0 0 10 42 22 1 2 22 53 158 0 9 59 3 11 26 3 9 17 48 12 8 20 Uncertainty in time = +/- 3 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: TYC 6842-01353-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 06 22.1783 DE: -23 15 56.631 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .025 ) * V mag [mag]: 12.1 * B mag [mag]: 12.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (147) Protogeneia approx. diameter [km]: 133 approx. diameter ["]: .056 distance from Earth [AU]: 3.27400 * 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 = 264.01144004 deg Arg. of pericenter = 104.87643308 deg Long. of node = 248.72531112 deg Inclination = 1.93467391 deg Eccentricity = 0.03330869 Semimajor axis = 3.13831767 AU Perihelion dist = 3.03378442 AU Mag: H = 8.55, G = 0.15 Epoch of elements : MJD 54531.04400000 TDT (2008 Mar 06.044) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 6 147 Protogeneia 1h 3.3m UT 12.1 18 6 22.178-23 15 56.63TYC 6842-01353-1 12.4 14.3 133 5.4 3.274 2.714 1.37 91.6233 -23.266 167.00 -5.58 1.0551 -0.01993 0.55419 13.92324 0.51037 -0.00573 -0.00006 2000 263.8263602008 3 5.00000104.876433248.725311 1.9346740.03330869 3.1383177 3.0337844 8.3 5.00.15 RATE 1.7727960 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.027 360 1.48 0.027 0 54523.5020080306_1353-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org