IOTA/IOTA-ES occultation update for (128) Nemesis / TYC 6373-00283-1 event on 2008 Jul 06, 04:27 UT Visible from N Brazil, Peru Summary ------- On 2008 Jul 06 UT, the 188 km diameter asteroid (128) Nemesis will occult a 11.2 mag star in the constellation Capricornus for observers along a path across N Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 11.5 mag (the magnitude of the asteroid) for at most 30.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2008 Jul 06, 04:14 - 2008 Jul 06, 04:40 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 0.9 * estimated maximum duration [s]: 30.2 * Moon: 13 % sunlit, 168° distance * Sun: 145° distance * rough path description: N Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 249 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 6.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .027", 86° ) * approx speed of asteroid's shadow [km/s]: 6.2247 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6373-00283-1 by 128 Nemesis on 2008 Jul 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 ' " Longitude Longitude Longitude Longitude - 22 3 25 61 0 0 4 14 44 7 182 0 - 24 27 22 - 19 41 16 - 25 25 31 - 18 44 50 - 22 22 47 60 0 0 4 14 47 8 182 -1 - 24 42 42 - 20 4 36 - 25 39 13 - 19 9 45 - 22 42 59 59 0 0 4 14 51 9 182 -2 - 24 59 9 - 20 28 29 - 25 54 9 - 19 35 5 - 23 3 58 58 0 0 4 14 55 10 181 -3 - 25 16 40 - 20 52 53 - 26 10 15 - 20 0 51 - 23 25 42 57 0 0 4 14 59 11 181 -4 - 25 35 10 - 21 17 48 - 26 27 26 - 20 27 2 - 23 48 9 56 0 0 4 15 4 12 181 -5 - 25 54 36 - 21 43 13 - 26 45 39 - 20 53 38 - 24 11 17 55 0 0 4 15 9 13 180 -6 - 26 14 56 - 22 9 8 - 27 4 51 - 21 20 39 - 24 35 6 54 0 0 4 15 14 14 180 -7 - 26 36 7 - 22 35 32 - 27 24 59 - 21 48 4 - 24 59 33 53 0 0 4 15 20 15 180 -8 - 26 58 8 - 23 2 24 - 27 46 0 - 22 15 54 - 25 24 39 52 0 0 4 15 27 16 179 -9 - 27 20 56 - 23 29 46 - 28 7 53 - 22 44 9 - 25 50 22 51 0 0 4 15 34 17 179 -10 - 27 44 30 - 23 57 35 - 28 30 35 - 23 12 50 - 26 16 41 50 0 0 4 15 41 18 179 -11 - 28 8 50 - 24 25 54 - 28 54 6 - 23 41 55 - 26 43 37 49 0 0 4 15 49 19 178 -12 - 28 33 53 - 24 54 41 - 29 18 24 - 24 11 27 - 27 11 8 48 0 0 4 15 57 20 178 -13 - 28 59 39 - 25 23 56 - 29 43 28 - 24 41 24 - 27 39 15 47 0 0 4 16 6 21 177 -14 - 29 26 8 - 25 53 41 - 30 9 17 - 25 11 47 - 28 7 58 46 0 0 4 16 15 22 177 -15 - 29 53 18 - 26 23 55 - 30 35 50 - 25 42 37 - 28 37 16 45 0 0 4 16 24 23 176 -16 - 30 21 10 - 26 54 38 - 31 3 8 - 26 13 55 - 29 7 9 44 0 0 4 16 34 24 176 -17 - 30 49 44 - 27 25 51 - 31 31 9 - 26 45 40 - 29 37 38 43 0 0 4 16 44 25 175 -18 - 31 18 58 - 27 57 35 - 31 59 53 - 27 17 53 - 30 8 43 42 0 0 4 16 55 26 175 -19 - 31 48 53 - 28 29 50 - 32 29 20 - 27 50 36 - 30 40 25 41 0 0 4 17 6 27 174 -20 - 32 19 30 - 29 2 36 - 32 59 31 - 28 23 48 - 31 12 43 40 0 0 4 17 17 28 174 -21 - 32 50 48 - 29 35 54 - 33 30 25 - 28 57 30 - 31 45 38 39 0 0 4 17 29 29 173 -22 - 33 22 48 - 30 9 44 - 34 2 3 - 29 31 43 - 32 19 11 38 0 0 4 17 42 30 173 -23 - 33 55 30 - 30 44 9 - 34 34 24 - 30 6 28 - 32 53 22 37 0 0 4 17 55 31 172 -24 - 34 28 54 - 31 19 7 - 35 7 30 - 30 41 45 - 33 28 13 36 0 0 4 18 8 32 171 -25 - 35 3 2 - 31 54 41 - 35 41 21 - 31 17 36 - 34 3 43 35 0 0 4 18 21 32 171 -26 - 35 37 53 - 32 30 50 - 36 15 57 - 31 54 2 - 34 39 54 34 0 0 4 18 35 33 170 -27 - 36 13 30 - 33 7 37 - 36 51 19 - 32 31 3 - 35 16 47 33 0 0 4 18 50 34 169 -28 - 36 49 51 - 33 45 2 - 37 27 29 - 33 8 40 - 35 54 23 32 0 0 4 19 5 35 168 -29 - 37 27 0 - 34 23 6 - 38 4 27 - 33 46 56 - 36 32 42 31 0 0 4 19 20 36 168 -31 - 38 4 56 - 35 1 50 - 38 42 14 - 34 25 50 - 37 11 47 30 0 0 4 19 36 37 167 -32 - 38 43 41 - 35 41 16 - 39 20 51 - 35 5 25 - 37 51 39 29 0 0 4 19 52 38 166 -33 - 39 23 16 - 36 21 25 - 40 0 21 - 35 45 41 - 38 32 18 28 0 0 4 20 8 39 165 -34 - 40 3 44 - 37 2 19 - 40 40 43 - 36 26 41 - 39 13 48 27 0 0 4 20 25 39 164 -35 - 40 45 4 - 37 43 58 - 41 22 1 - 37 8 25 - 39 56 9 26 0 0 4 20 42 40 163 -36 - 41 27 20 - 38 26 26 - 42 4 15 - 37 50 56 - 40 39 23 25 0 0 4 21 0 41 162 -37 - 42 10 33 - 39 9 43 - 42 47 28 - 38 34 15 - 41 23 32 24 0 0 4 21 18 42 161 -38 - 42 54 45 - 39 53 52 - 43 31 42 - 39 18 24 - 42 8 39 23 0 0 4 21 37 42 160 -40 - 43 39 58 - 40 38 55 - 44 16 58 - 40 3 26 - 42 54 45 22 0 0 4 21 56 43 159 -41 - 44 26 15 - 41 24 53 - 45 3 21 - 40 49 22 - 43 41 54 21 0 0 4 22 15 44 158 -42 - 45 13 39 - 42 11 50 - 45 50 52 - 41 36 15 - 44 30 8 20 0 0 4 22 35 44 156 -43 - 46 2 13 - 42 59 48 - 46 39 34 - 42 24 7 - 45 19 30 19 0 0 4 22 55 45 155 -44 - 46 51 59 - 43 48 49 - 47 29 31 - 43 13 1 - 46 10 4 18 0 0 4 23 16 46 154 -46 - 47 43 1 - 44 38 58 - 48 20 46 - 44 3 1 - 47 1 52 17 0 0 4 23 37 46 152 -47 - 48 35 24 - 45 30 17 - 49 13 24 - 44 54 9 - 47 55 0 16 0 0 4 23 58 47 151 -48 - 49 29 11 - 46 22 50 - 50 7 28 - 45 46 29 - 48 49 31 15 0 0 4 24 20 47 150 -49 - 50 24 28 - 47 16 40 - 51 3 5 - 46 40 5 - 49 45 30 14 0 0 4 24 43 48 148 -51 - 51 21 18 - 48 11 53 - 52 0 18 - 47 35 1 - 50 43 1 13 0 0 4 25 5 48 146 -52 - 52 19 49 - 49 8 33 - 52 59 14 - 48 31 22 - 51 42 12 12 0 0 4 25 29 48 145 -53 - 53 20 6 - 50 6 45 - 54 0 0 - 49 29 12 - 52 43 9 11 0 0 4 25 52 49 143 -54 - 54 22 17 - 51 6 35 - 55 2 43 - 50 28 38 - 53 45 58 10 0 0 4 26 17 49 141 -55 - 55 26 30 - 52 8 10 - 56 7 32 - 51 29 45 - 54 50 47 9 0 0 4 26 41 49 140 -57 - 56 32 53 - 53 11 36 - 57 14 37 - 52 32 41 - 55 57 47 8 0 0 4 27 7 49 138 -58 - 57 41 38 - 54 17 2 - 58 24 8 - 53 37 32 - 57 7 6 7 0 0 4 27 32 49 136 -59 - 58 52 56 - 55 24 38 - 59 36 18 - 54 44 29 - 58 18 58 6 0 0 4 27 58 49 134 -60 - 60 7 1 - 56 34 32 - 60 51 22 - 55 53 41 - 59 33 35 5 0 0 4 28 25 49 132 -62 - 61 24 9 - 57 46 58 - 62 9 36 - 57 5 18 - 60 51 14 4 0 0 4 28 53 49 131 -63 - 62 44 39 - 59 2 8 - 63 31 22 - 58 19 34 - 62 12 13 3 0 0 4 29 21 48 129 -64 - 64 8 53 - 60 20 19 - 64 57 3 - 59 36 44 - 63 36 55 2 0 0 4 29 49 48 127 -65 - 65 37 18 - 61 41 49 - 66 27 8 - 60 57 5 - 65 5 45 1 0 0 4 30 19 48 125 -66 - 67 10 27 - 63 6 59 - 68 2 15 - 62 20 56 - 66 39 17 0 0 0 4 30 49 47 123 -67 - 68 49 2 - 64 36 17 - 69 43 8 - 63 48 44 - 68 18 10 - 1 0 0 4 31 20 46 122 -68 - 70 33 54 - 66 10 14 - 71 30 46 - 65 20 56 Latitude Latitude Latitude Latitude - 70 0 0 - 1 58 12 4 31 51 45 120 -69 - 0 41 2 - 3 13 43 - 0 9 41 - 3 43 29 - 71 0 0 - 2 30 49 4 32 9 45 119 -69 - 1 14 20 - 3 45 41 - 0 43 16 - 4 15 13 - 72 0 0 - 3 2 13 4 32 27 44 118 -70 - 1 46 23 - 4 16 29 - 1 15 36 - 4 45 47 - 73 0 0 - 3 32 25 4 32 44 44 118 -70 - 2 17 13 - 4 46 6 - 1 46 41 - 5 15 11 - 74 0 0 - 4 1 27 4 33 1 43 117 -70 - 2 46 50 - 5 14 34 - 2 16 33 - 5 43 26 - 75 0 0 - 4 29 19 4 33 18 42 116 -70 - 3 15 15 - 5 41 55 - 2 45 12 - 6 10 34 - 76 0 0 - 4 56 1 4 33 34 42 115 -70 - 3 42 30 - 6 8 8 - 3 12 40 - 6 36 36 - 77 0 0 - 5 21 36 4 33 50 41 115 -70 - 4 8 35 - 6 33 14 - 3 38 58 - 7 1 31 - 78 0 0 - 5 46 4 4 34 5 40 114 -70 - 4 33 32 - 6 57 15 - 4 4 6 - 7 25 22 - 79 0 0 - 6 9 26 4 34 21 40 114 -70 - 4 57 20 - 7 20 11 - 4 28 6 - 7 48 8 - 80 0 0 - 6 31 42 4 34 36 39 113 -70 - 5 20 2 - 7 42 3 - 4 50 58 - 8 9 51 - 81 0 0 - 6 52 53 4 34 51 38 113 -70 - 5 41 37 - 8 2 52 - 5 12 43 - 8 30 31 - 82 0 0 - 7 13 0 4 35 5 38 112 -69 - 6 2 6 - 8 22 38 - 5 33 22 - 8 50 8 - 83 0 0 - 7 32 4 4 35 19 37 112 -69 - 6 21 31 - 8 41 21 - 5 52 55 - 9 8 44 - 84 0 0 - 7 50 5 4 35 33 36 112 -68 - 6 39 51 - 8 59 3 - 6 11 24 - 9 26 19 - 85 0 0 - 8 7 3 4 35 46 35 111 -68 - 6 57 8 - 9 15 44 - 6 28 48 - 9 42 53 - 86 0 0 - 8 22 59 4 35 59 34 111 -67 - 7 13 21 - 9 31 25 - 6 45 9 - 9 58 27 - 87 0 0 - 8 37 55 4 36 12 34 111 -67 - 7 28 32 - 9 46 5 - 7 0 26 -10 13 2 - 88 0 0 - 8 51 49 4 36 25 33 111 -66 - 7 42 41 - 9 59 45 - 7 14 40 -10 26 37 - 89 0 0 - 9 4 42 4 36 37 32 110 -66 - 7 55 47 -10 12 26 - 7 27 52 -10 39 13 - 90 0 0 - 9 16 35 4 36 49 31 110 -65 - 8 7 52 -10 24 8 - 7 40 2 -10 50 51 - 91 0 0 - 9 27 29 4 37 0 30 110 -64 - 8 18 56 -10 34 51 - 7 51 11 -11 1 30 - 92 0 0 - 9 37 22 4 37 12 30 110 -64 - 8 28 59 -10 44 36 - 8 1 18 -11 11 11 - 93 0 0 - 9 46 17 4 37 23 29 110 -63 - 8 38 2 -10 53 23 - 8 10 23 -11 19 55 - 94 0 0 - 9 54 12 4 37 33 28 110 -62 - 8 46 3 -11 1 11 - 8 18 28 -11 27 40 - 95 0 0 -10 1 7 4 37 44 27 110 -61 - 8 53 5 -11 8 1 - 8 25 32 -11 34 28 - 96 0 0 -10 7 4 4 37 54 26 110 -61 - 8 59 6 -11 13 53 - 8 31 34 -11 40 19 - 97 0 0 -10 12 1 4 38 4 25 110 -60 - 9 4 7 -11 18 48 - 8 36 37 -11 45 12 - 98 0 0 -10 16 0 4 38 13 25 110 -59 - 9 8 7 -11 22 44 - 8 40 38 -11 49 8 - 99 0 0 -10 18 59 4 38 22 24 110 -58 - 9 11 7 -11 25 43 - 8 43 38 -11 52 6 -100 0 0 -10 20 59 4 38 31 23 110 -57 - 9 13 7 -11 27 43 - 8 45 38 -11 54 7 -101 0 0 -10 22 0 4 38 39 22 110 -57 - 9 14 6 -11 28 46 - 8 46 36 -11 55 10 -102 0 0 -10 22 1 4 38 48 21 110 -56 - 9 14 5 -11 28 50 - 8 46 33 -11 55 15 -103 0 0 -10 21 3 4 38 56 20 110 -55 - 9 13 2 -11 27 55 - 8 45 29 -11 54 21 -104 0 0 -10 19 4 4 39 3 19 110 -54 - 9 10 58 -11 26 1 - 8 43 23 -11 52 30 -105 0 0 -10 16 5 4 39 10 18 110 -53 - 9 7 52 -11 23 9 - 8 40 14 -11 49 40 -106 0 0 -10 12 5 4 39 17 17 110 -52 - 9 3 44 -11 19 16 - 8 36 3 -11 45 50 -107 0 0 -10 7 4 4 39 24 16 110 -51 - 8 58 33 -11 14 24 - 8 30 48 -11 41 1 -108 0 0 -10 1 1 4 39 30 16 110 -50 - 8 52 20 -11 8 31 - 8 24 30 -11 35 13 -109 0 0 - 9 53 56 4 39 36 15 110 -49 - 8 45 2 -11 1 38 - 8 17 7 -11 28 23 -110 0 0 - 9 45 48 4 39 42 14 111 -48 - 8 36 40 -10 53 42 - 8 8 40 -11 20 33 -111 0 0 - 9 36 36 4 39 47 13 111 -48 - 8 27 13 -10 44 45 - 7 59 6 -11 11 41 -112 0 0 - 9 26 20 4 39 52 12 111 -47 - 8 16 41 -10 34 44 - 7 48 27 -11 1 46 -113 0 0 - 9 14 58 4 39 56 11 111 -46 - 8 5 1 -10 23 40 - 7 36 39 -10 50 48 -114 0 0 - 9 2 31 4 40 1 10 111 -45 - 7 52 14 -10 11 31 - 7 23 44 -10 38 47 -115 0 0 - 8 48 57 4 40 4 9 111 -44 - 7 38 18 - 9 58 17 - 7 9 39 -10 25 40 -116 0 0 - 8 34 14 4 40 8 8 111 -43 - 7 23 12 - 9 43 56 - 6 54 24 -10 11 28 -117 0 0 - 8 18 22 4 40 11 7 111 -42 - 7 6 56 - 9 28 28 - 6 37 57 - 9 56 9 -118 0 0 - 8 1 21 4 40 14 6 112 -41 - 6 49 27 - 9 11 51 - 6 20 17 - 9 39 42 -119 0 0 - 7 43 7 4 40 16 5 112 -40 - 6 30 45 - 8 54 5 - 6 1 23 - 9 22 5 -120 0 0 - 7 23 41 4 40 18 4 112 -39 - 6 10 48 - 8 35 7 - 5 41 14 - 9 3 19 -121 0 0 - 7 3 1 4 40 19 3 112 -38 - 5 49 35 - 8 14 57 - 5 19 47 - 8 43 21 -122 0 0 - 6 41 4 4 40 20 2 112 -36 - 5 27 4 - 7 53 34 - 4 57 1 - 8 22 10 -123 0 0 - 6 17 51 4 40 20 1 112 -35 - 5 3 14 - 7 30 55 .. .. .. - 7 59 44 Uncertainty in time = +/- 7 secs [Prediction of 2008 Jul 3.0] Data for the target star ------------------------ * name: TYC 6373-00283-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 21 33 53.2097 DE: -22 08 42.811 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .024 ) * V mag [mag]: 11.2 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (128) Nemesis approx. diameter [km]: 188 approx. diameter ["]: .151 distance from Earth [AU]: 1.71200 * orbital information: orbit source: Preston date of fit: 2008 Jul 02 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 692 number of rejected observations: 155 time covered by the observations: 1904 Nov 17 - 2008 Jun 29 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.013, 74° remarks: * orbital elements for (128) Nemesis : Mean anomaly = 300.58650253 deg Arg. of pericenter = 302.34504553 deg Long. of node = 76.44383637 deg Inclination = 6.24950958 deg Eccentricity = 0.12516832 Semimajor axis = 2.75150284 AU Perihelion dist = 2.40710185 AU Mag: H = 7.49, G = 0.15 Epoch of elements : MJD 54653.18600000 TDT (2008 Jul 06.186) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 6 128 Nemesis 4h 27.4m UT 11.2 21 33 53.210-22 8 42.81TYC 6373-00283-1 11.5 11.5 188 30.2 1.712 -0.881 -13.29 -27.9127 -22.141 114.35 22.65 4.4569 -0.48093 0.44320 -2.37846 -2.58592 -0.00310 -0.00045 2000 299.8984932008 7 3.00000302.345046 76.443836 6.2495100.12516832 2.7515028 2.4071019 7.5 5.00.15 RATE 2.1594790 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.027 86 1.20 0.031 0 54650.5020080706_0283-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jul 03, 00:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org