IOTA/IOTA-ES occultation update for (845) Naema / TYC 1437-00066-1 event on 2008 Dec 05, 16:13 UT Visible from W Pacific Ocean Summary ------- On 2008 Dec 05 UT, the 54 km diameter asteroid (845) Naema will occult a 10.1 mag star in the constellation Leo for observers along a path across W Pacific Ocean. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 15.5 mag (the magnitude of the asteroid) for at most 3.4 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: 60 * date and approx. time of event: 2008 Dec 05, 16:07 - 2008 Dec 05, 16:13 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 3.4 * Moon: 48 % sunlit, 165° distance * Sun: 90° distance * rough path description: W Pacific Ocean The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 1.03 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .026", 102° ) * approx speed of asteroid's shadow [km/s]: 16.0123 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1437-00066-1 by 845 Naema on 2008 Dec 5 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 124 0 0 2 29 3 16 7 23 1 72 -68 2 13 37 2 44 29 1 41 48 3 16 16 125 0 0 2 48 42 16 7 23 2 72 -68 2 33 16 3 4 7 2 1 28 3 35 53 126 0 0 3 8 12 16 7 24 3 72 -68 2 52 47 3 23 37 2 21 1 3 55 21 127 0 0 3 27 34 16 7 24 4 72 -68 3 12 10 3 42 59 2 40 25 4 14 42 128 0 0 3 46 48 16 7 24 5 72 -68 3 31 24 4 2 12 2 59 40 4 33 53 129 0 0 4 5 53 16 7 25 6 72 -68 3 50 29 4 21 16 3 18 47 4 52 56 130 0 0 4 24 48 16 7 26 7 72 -67 4 9 25 4 40 10 3 37 44 5 11 49 131 0 0 4 43 33 16 7 27 8 72 -67 4 28 11 4 58 55 3 56 31 5 30 32 132 0 0 5 2 8 16 7 28 9 72 -67 4 46 47 5 17 29 4 15 9 5 49 5 133 0 0 5 20 33 16 7 29 10 72 -66 5 5 12 5 35 53 4 33 35 6 7 27 134 0 0 5 38 46 16 7 31 11 73 -66 5 23 26 5 54 5 4 51 51 6 25 38 135 0 0 5 56 48 16 7 32 12 73 -65 5 41 29 6 12 7 5 9 56 6 43 38 136 0 0 6 14 38 16 7 34 13 73 -65 5 59 20 6 29 56 5 27 48 7 1 26 137 0 0 6 32 16 16 7 35 14 73 -64 6 16 59 6 47 33 5 45 29 7 19 2 138 0 0 6 49 42 16 7 37 15 73 -63 6 34 26 7 4 58 6 2 57 7 36 25 139 0 0 7 6 55 16 7 39 16 73 -63 6 51 40 7 22 10 6 20 13 7 53 35 140 0 0 7 23 55 16 7 41 17 73 -62 7 8 40 7 39 9 6 37 15 8 10 32 141 0 0 7 40 41 16 7 44 18 73 -62 7 25 27 7 55 55 6 54 4 8 27 16 142 0 0 7 57 14 16 7 46 19 73 -61 7 42 1 8 12 26 7 10 39 8 43 46 143 0 0 8 13 32 16 7 48 21 74 -60 7 58 20 8 28 44 7 27 0 9 0 1 144 0 0 8 29 36 16 7 51 22 74 -59 8 14 25 8 44 47 7 43 7 9 16 3 145 0 0 8 45 25 16 7 54 23 74 -59 8 30 15 9 0 35 7 58 59 9 31 49 146 0 0 9 0 59 16 7 56 24 74 -58 8 45 50 9 16 8 8 14 36 9 47 20 147 0 0 9 16 18 16 7 59 25 74 -57 9 1 10 9 31 26 8 29 57 10 2 37 148 0 0 9 31 21 16 8 2 26 74 -56 9 16 14 9 46 29 8 45 4 10 17 37 149 0 0 9 46 9 16 8 6 27 74 -56 9 31 2 10 1 15 8 59 54 10 32 22 150 0 0 10 0 41 16 8 9 28 75 -55 9 45 35 10 15 46 9 14 28 10 46 51 151 0 0 10 14 56 16 8 12 29 75 -54 9 59 51 10 30 0 9 28 46 11 1 3 152 0 0 10 28 54 16 8 16 30 75 -53 10 13 50 10 43 58 9 42 47 11 14 59 153 0 0 10 42 36 16 8 19 31 75 -52 10 27 33 10 57 39 9 56 32 11 28 38 154 0 0 10 56 1 16 8 23 32 75 -52 10 40 59 11 11 3 10 10 0 11 42 0 155 0 0 11 9 8 16 8 27 33 75 -51 10 54 7 11 24 9 10 23 10 11 55 4 156 0 0 11 21 58 16 8 31 34 76 -50 11 6 58 11 36 58 10 36 3 12 7 52 157 0 0 11 34 31 16 8 35 35 76 -49 11 19 31 11 49 30 10 48 38 12 20 21 158 0 0 11 46 45 16 8 39 36 76 -48 11 31 47 12 1 44 11 0 55 12 32 33 159 0 0 11 58 42 16 8 43 37 76 -47 11 43 44 12 13 39 11 12 54 12 44 27 160 0 0 12 10 20 16 8 47 38 76 -46 11 55 23 12 25 17 11 24 35 12 56 3 161 0 0 12 21 40 16 8 52 39 77 -46 12 6 44 12 36 36 11 35 58 13 7 20 162 0 0 12 32 42 16 8 56 40 77 -45 12 17 47 12 47 37 11 47 2 13 18 19 163 0 0 12 43 24 16 9 1 41 77 -44 12 28 30 12 58 18 11 57 47 13 28 59 164 0 0 12 53 48 16 9 5 42 77 -43 12 38 55 13 8 41 12 8 13 13 39 21 165 0 0 13 3 53 16 9 10 43 77 -42 12 49 0 13 18 46 12 18 21 13 49 23 166 0 0 13 13 39 16 9 15 44 77 -41 12 58 47 13 28 30 12 28 9 13 59 7 167 0 0 13 23 5 16 9 20 45 78 -40 13 8 14 13 37 56 12 37 37 14 8 31 168 0 0 13 32 12 16 9 25 46 78 -39 13 17 22 13 47 2 12 46 47 14 17 36 169 0 0 13 41 0 16 9 30 47 78 -38 13 26 10 13 55 49 12 55 36 14 26 21 170 0 0 13 49 28 16 9 35 48 78 -38 13 34 39 14 4 17 13 4 7 14 34 47 171 0 0 13 57 36 16 9 40 49 78 -37 13 42 48 14 12 24 13 12 17 14 42 53 172 0 0 14 5 24 16 9 46 50 78 -36 13 50 37 14 20 12 13 20 7 14 50 39 173 0 0 14 12 53 16 9 51 51 79 -35 13 58 5 14 27 39 13 27 37 14 58 5 174 0 0 14 20 1 16 9 56 52 79 -34 14 5 14 14 34 47 13 34 47 15 5 12 175 0 0 14 26 49 16 10 2 53 79 -33 14 12 3 14 41 35 13 41 37 15 11 58 176 0 0 14 33 17 16 10 8 54 79 -32 14 18 32 14 48 2 13 48 7 15 18 25 177 0 0 14 39 25 16 10 13 55 79 -31 14 24 40 14 54 9 13 54 16 15 24 31 178 0 0 14 45 12 16 10 19 56 79 -30 14 30 28 14 59 56 14 0 5 15 30 16 179 0 0 14 50 39 16 10 25 57 79 -29 14 35 55 15 5 22 14 5 33 15 35 42 180 0 0 14 55 45 16 10 30 58 79 -28 14 41 2 15 10 28 14 10 41 15 40 47 -179 0 0 15 0 31 16 10 36 59 80 -28 14 45 48 15 15 14 14 15 28 15 45 31 -178 0 0 15 4 56 16 10 42 60 80 -27 14 50 14 15 19 38 14 19 55 15 49 55 -177 0 0 15 9 1 16 10 48 61 80 -26 14 54 18 15 23 42 14 24 0 15 53 59 -176 0 0 15 12 44 16 10 54 62 80 -25 14 58 2 15 27 26 14 27 45 15 57 41 -175 0 0 15 16 7 16 11 1 63 80 -24 15 1 26 15 30 49 14 31 9 16 1 3 -174 0 0 15 19 9 16 11 7 64 80 -23 15 4 28 15 33 50 14 34 12 16 4 5 -173 0 0 15 21 51 16 11 13 65 80 -22 15 7 10 15 36 31 14 36 54 16 6 45 -172 0 0 15 24 11 16 11 19 66 80 -21 15 9 30 15 38 52 14 39 15 16 9 5 -171 0 0 15 26 10 16 11 25 67 80 -20 15 11 30 15 40 51 14 41 15 16 11 4 -170 0 0 15 27 49 16 11 32 68 80 -19 15 13 8 15 42 29 14 42 54 16 12 42 -169 0 0 15 29 6 16 11 38 69 79 -18 15 14 26 15 43 47 14 44 12 16 13 59 -168 0 0 15 30 3 16 11 45 70 79 -17 15 15 23 15 44 43 14 45 8 16 14 55 -167 0 0 15 30 38 16 11 51 71 79 -16 15 15 58 15 45 18 14 45 44 16 15 31 -166 0 0 15 30 53 16 11 58 72 79 -16 15 16 13 15 45 33 14 45 59 16 15 45 -165 0 0 15 30 46 16 12 4 73 78 -15 15 16 6 15 45 26 14 45 52 16 15 38 -164 0 0 15 30 19 16 12 11 74 78 -14 15 15 38 15 44 59 14 45 24 16 15 11 -163 0 0 15 29 30 16 12 18 74 78 -13 15 14 50 15 44 10 14 44 35 16 14 22 -162 0 0 15 28 20 16 12 24 75 77 -12 15 13 40 15 43 0 14 43 25 16 13 13 -161 0 0 15 26 49 16 12 31 76 76 -11 15 12 9 15 41 30 14 41 54 16 11 43 -160 0 0 15 24 57 16 12 38 77 75 -10 15 10 17 15 39 38 14 40 1 16 9 51 -159 0 0 15 22 44 16 12 44 78 74 -9 15 8 3 15 37 25 14 37 48 16 7 39 -158 0 0 15 20 10 16 12 51 79 73 -8 15 5 29 15 34 51 14 35 13 16 5 6 -157 0 0 15 17 15 16 12 58 80 71 -7 15 2 34 15 31 57 14 32 17 16 2 11 -156 0 0 15 13 59 16 13 5 81 69 -6 14 59 18 15 28 41 14 29 0 15 58 56 -155 0 0 15 10 22 16 13 12 82 66 -5 14 55 40 15 25 4 14 25 22 15 55 20 -154 0 0 15 6 24 16 13 19 83 63 -4 14 51 42 15 21 7 14 21 23 15 51 23 -153 0 0 15 2 6 16 13 25 84 59 -3 14 47 23 15 16 48 14 17 3 15 47 6 -152 0 0 14 57 26 16 13 32 84 53 -2 14 42 42 15 12 9 14 12 22 15 42 27 -151 0 0 14 52 25 16 13 39 85 45 -1 14 37 41 15 7 9 14 7 20 15 37 28 -150 0 0 14 47 4 16 13 46 86 35 0 14 32 19 15 1 48 14 1 57 15 32 8 Uncertainty in time = +/- 4 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 1437-00066-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 22 41.8769 DE: +18 10 38.835 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .022 ) * V mag [mag]: 10.1 * B mag [mag]: 11.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (845) Naema approx. diameter [km]: 54 approx. diameter ["]: .025 distance from Earth [AU]: 2.97300 * orbital information: orbit source: Preston date of fit: 2008 Oct 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 652 number of rejected observations: 63 time covered by the observations: 1916 Nov 16 - 2008 May 06 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.014, 122° remarks: * orbital elements for (845) Naema : Mean anomaly = 164.74515563 deg Arg. of pericenter = 295.24952257 deg Long. of node = 43.28202980 deg Inclination = 12.62716661 deg Eccentricity = 0.06457331 Semimajor axis = 2.94054282 AU Perihelion dist = 2.75066224 AU Mag: H = 10.14, G = 0.15 Epoch of elements : MJD 54805.67600000 TDT (2008 Dec 05.676) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 5 845 Naema 16h 14.0m UT 10.1 11 22 41.877 18 10 38.84TYC 1437-00066-1 11.0 15.5 54 3.4 2.973 1.865 -2.81 -147.6625 18.178 -65.79 -22.47 16.2336 -0.00563 -0.06354 8.98763 -0.95072 -0.00550 0.00242 2000 163.63571220081130.00000295.249523 43.282030 12.6271670.06457331 2.9405428 2.7506622 9.7 5.00.15 RATE 1.9546230 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.026 102 2.03 0.026 0 54796.5020081205_0066-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org