IOTA/IOTA-ES occultation update for (163) Erigone / TYC 6321-00601-1 event on 2008 Nov 05, 10:37 UT Visible from N Australia Summary ------- On 2008 Nov 05 UT, the 73 km diameter asteroid (163) Erigone will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 15.1 mag (the magnitude of the asteroid) for at most 3.1 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: 79 * date and approx. time of event: 2008 Nov 05, 10:38 - 2008 Nov 05, 10:41 UT * midpoint of event [JD]: 2454775.94243333 * magnitude of target star: 12.4 * magnitude drop [mag]: 2.8 * estimated maximum duration [s]: 3.1 * Moon: 43 % sunlit, 7° distance * Sun: 74° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.68 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .025", 89° ) * approx speed of asteroid's shadow [km/s]: 23.4749 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6321-00601-1 by 163 Erigone on 2008 Nov 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 113 0 0 -19 15 24 10 38 26 73 268 -1 -19 35 40 -18 55 9 -20 3 15 -18 27 36 114 0 0 -19 3 2 10 38 30 72 267 -2 -19 23 20 -18 42 45 -19 50 56 -18 15 11 115 0 0 -18 50 22 10 38 35 71 266 -3 -19 10 40 -18 30 3 -19 38 18 -18 2 27 116 0 0 -18 37 22 10 38 39 70 265 -4 -18 57 42 -18 17 3 -19 25 22 -17 49 24 117 0 0 -18 24 5 10 38 43 69 265 -5 -18 44 26 -18 3 43 -19 12 8 -17 36 3 118 0 0 -18 10 29 10 38 48 68 264 -6 -18 30 51 -17 50 6 -18 58 35 -17 22 24 119 0 0 -17 56 34 10 38 52 67 263 -7 -18 16 59 -17 36 11 -18 44 44 -17 8 27 120 0 0 -17 42 22 10 38 57 66 263 -8 -18 2 48 -17 21 57 -18 30 36 -16 54 11 121 0 0 -17 27 53 10 39 1 65 262 -9 -17 48 20 -17 7 26 -18 16 9 -16 39 38 122 0 0 -17 13 5 10 39 5 64 262 -10 -17 33 34 -16 52 37 -18 1 25 -16 24 47 123 0 0 -16 58 1 10 39 9 63 261 -11 -17 18 31 -16 37 31 -17 46 24 -16 9 39 124 0 0 -16 42 39 10 39 14 62 261 -12 -17 3 10 -16 22 8 -17 31 6 -15 54 14 125 0 0 -16 27 0 10 39 18 61 260 -13 -16 47 33 -16 6 28 -17 15 30 -15 38 32 126 0 0 -16 11 5 10 39 22 60 260 -14 -16 31 39 -15 50 31 -16 59 38 -15 22 33 127 0 0 -15 54 53 10 39 26 59 259 -15 -16 15 29 -15 34 18 -16 43 30 -15 6 18 128 0 0 -15 38 25 10 39 30 58 259 -16 -15 59 2 -15 17 48 -16 27 5 -14 49 47 129 0 0 -15 21 41 10 39 34 57 259 -17 -15 42 20 -15 1 3 -16 10 25 -14 33 0 130 0 0 -15 4 42 10 39 38 56 258 -18 -15 25 21 -14 44 2 -15 53 28 -14 15 57 131 0 0 -14 47 27 10 39 42 55 258 -19 -15 8 8 -14 26 46 -15 36 17 -13 58 39 132 0 0 -14 29 57 10 39 46 54 258 -20 -14 50 39 -14 9 15 -15 18 50 -13 41 6 133 0 0 -14 12 12 10 39 50 53 257 -21 -14 32 56 -13 51 28 -15 1 8 -13 23 18 134 0 0 -13 54 13 10 39 54 52 257 -22 -14 14 58 -13 33 28 -14 43 12 -13 5 15 135 0 0 -13 35 59 10 39 58 51 257 -23 -13 56 46 -13 15 13 -14 25 2 -12 46 59 136 0 0 -13 17 32 10 40 2 50 256 -24 -13 38 20 -12 56 45 -14 6 38 -12 28 29 137 0 0 -12 58 51 10 40 6 49 256 -25 -13 19 41 -12 38 3 -13 48 0 -12 9 45 138 0 0 -12 39 58 10 40 9 48 256 -26 -13 0 48 -12 19 8 -13 29 9 -11 50 49 139 0 0 -12 20 51 10 40 13 47 255 -27 -12 41 43 -12 0 0 -13 10 5 -11 31 39 140 0 0 -12 1 32 10 40 16 46 255 -28 -12 22 25 -11 40 40 -12 50 49 -11 12 18 141 0 0 -11 42 1 10 40 20 44 255 -29 -12 2 55 -11 21 8 -12 31 21 -10 52 44 142 0 0 -11 22 19 10 40 23 43 255 -30 -11 43 14 -11 1 25 -12 11 41 -10 32 59 143 0 0 -11 2 25 10 40 27 42 254 -31 -11 23 21 -10 41 30 -11 51 50 -10 13 3 144 0 0 -10 42 21 10 40 30 41 254 -32 -11 3 18 -10 21 24 -11 31 48 - 9 52 56 145 0 0 -10 22 6 10 40 33 40 254 -33 -10 43 4 -10 1 9 -11 11 35 - 9 32 39 146 0 0 -10 1 41 10 40 37 39 254 -34 -10 22 40 - 9 40 43 -10 51 13 - 9 12 12 147 0 0 - 9 41 7 10 40 40 38 253 -35 -10 2 7 - 9 20 8 -10 30 41 - 8 51 36 148 0 0 - 9 20 24 10 40 43 37 253 -36 - 9 41 24 - 8 59 24 -10 10 0 - 8 30 50 149 0 0 - 8 59 32 10 40 46 36 253 -38 - 9 20 33 - 8 38 31 - 9 49 10 - 8 9 57 150 0 0 - 8 38 32 10 40 49 35 253 -39 - 8 59 34 - 8 17 30 - 9 28 11 - 7 48 55 151 0 0 - 8 17 24 10 40 51 34 253 -40 - 8 38 27 - 7 56 22 - 9 7 5 - 7 27 46 152 0 0 - 7 56 9 10 40 54 33 253 -41 - 8 17 13 - 7 35 6 - 8 45 52 - 7 6 29 153 0 0 - 7 34 48 10 40 57 32 252 -42 - 7 55 52 - 7 13 44 - 8 24 32 - 6 45 6 154 0 0 - 7 13 20 10 41 0 31 252 -43 - 7 34 25 - 6 52 16 - 8 3 6 - 6 23 37 155 0 0 - 6 51 46 10 41 2 30 252 -44 - 7 12 52 - 6 30 42 - 7 41 33 - 6 2 2 156 0 0 - 6 30 8 10 41 5 29 252 -45 - 6 51 14 - 6 9 2 - 7 19 56 - 5 40 22 157 0 0 - 6 8 24 10 41 7 28 252 -46 - 6 29 30 - 5 47 19 - 6 58 13 - 5 18 38 158 0 0 - 5 46 37 10 41 9 27 252 -47 - 6 7 43 - 5 25 31 - 6 36 27 - 4 56 49 159 0 0 - 5 24 45 10 41 12 25 252 -48 - 5 45 52 - 5 3 39 - 6 14 36 - 4 34 57 160 0 0 - 5 2 51 10 41 14 24 251 -49 - 5 23 58 - 4 41 44 - 5 52 42 - 4 13 2 161 0 0 - 4 40 54 10 41 16 23 251 -50 - 5 2 1 - 4 19 47 - 5 30 45 - 3 51 4 162 0 0 - 4 18 54 10 41 18 22 251 -51 - 4 40 2 - 3 57 47 - 5 8 46 - 3 29 5 163 0 0 - 3 56 53 10 41 20 21 251 -52 - 4 18 1 - 3 35 46 - 4 46 45 - 3 7 3 164 0 0 - 3 34 51 10 41 21 20 251 -53 - 3 55 59 - 3 13 44 - 4 24 43 - 2 45 1 165 0 0 - 3 12 48 10 41 23 19 251 -54 - 3 33 56 - 2 51 41 - 4 2 41 - 2 22 59 166 0 0 - 2 50 46 10 41 25 18 251 -55 - 3 11 53 - 2 29 39 - 3 40 38 - 2 0 56 167 0 0 - 2 28 43 10 41 26 17 251 -56 - 2 49 51 - 2 7 36 - 3 18 35 - 1 38 54 168 0 0 - 2 6 42 10 41 28 16 251 -57 - 2 27 49 - 1 45 35 - 2 56 34 - 1 16 53 169 0 0 - 1 44 42 10 41 29 15 251 -58 - 2 5 49 - 1 23 36 - 2 34 33 - 0 54 54 170 0 0 - 1 22 44 10 41 30 14 251 -59 - 1 43 51 - 1 1 38 - 2 12 35 - 0 32 57 171 0 0 - 1 0 49 10 41 31 13 251 -60 - 1 21 55 - 0 39 43 - 1 50 39 - 0 11 2 172 0 0 - 0 38 57 10 41 32 12 251 -62 - 1 0 3 - 0 17 51 - 1 28 46 0 10 49 173 0 0 - 0 17 8 10 41 33 10 251 -63 - 0 38 14 0 3 57 - 1 6 56 0 32 37 174 0 0 0 4 37 10 41 34 9 251 -64 - 0 16 29 0 25 41 - 0 45 10 0 54 20 175 0 0 0 26 17 10 41 35 8 251 -65 0 5 12 0 47 21 - 0 23 29 1 15 59 176 0 0 0 47 52 10 41 36 7 251 -66 0 26 48 1 8 55 - 0 1 52 1 37 33 177 0 0 1 9 21 10 41 36 6 251 -67 0 48 18 1 30 24 0 19 39 1 59 1 178 0 0 1 30 45 10 41 37 5 251 -68 1 9 42 1 51 47 0 41 4 2 20 23 179 0 0 1 52 2 10 41 37 4 251 -69 1 31 0 2 13 3 1 2 23 2 41 38 180 0 0 2 13 12 10 41 38 3 251 -70 1 52 11 2 34 13 1 23 35 3 2 47 -179 0 0 2 34 15 10 41 38 2 251 -70 2 13 14 2 55 15 1 44 39 3 23 48 -178 0 0 2 55 10 10 41 38 1 251 -71 2 34 10 3 16 9 2 5 36 3 44 40 Uncertainty in time = +/- 2 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 6321-00601-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 57 09.1472 DE: -18 57 22.242 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .024 ) * V mag [mag]: 12.4 * B mag [mag]: 12.7 * Apparent position with proper motion RA(deg): 299.4178928763 DE(deg): -18.9331554582 * Equation of equinoxes (radians) : 0.000048444504037 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (163) Erigone approx. diameter [km]: 73 approx. diameter ["]: .036 distance from Earth [AU]: 2.76300 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 942 number of rejected observations: 97 time covered by the observations: 1903 Sep 23 - 2008 Sep 25 1 sigma uncertainty ellipse (major, minor, PA): 0.008, 0.006, 84° remarks: * orbital elements for (163) Erigone : Mean anomaly = 235.72696213 deg Arg. of pericenter = 298.17867626 deg Long. of node = 160.21165945 deg Inclination = 4.81134308 deg Eccentricity = 0.19000025 Semimajor axis = 2.36847773 AU Perihelion dist = 1.91846637 AU Mag: H = 9.42, G = -0.04 Epoch of elements : MJD 54775.44300000 TDT (2008 Nov 05.443) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Nov 5 163 Erigone 10h 37.1m UT 12.4 19 57 9.147-18 57 22.24TYC 6321-00601-1 12.7 15.1 73 3.1 2.763 2.955 4.65 94.9782 -18.958 16.63 -15.86 10.6184 0.00438 -0.05120 13.16914 1.46046 0.00548 0.00114 2000 234.25519720081031.00000298.178676160.211659 4.8113430.19000025 2.3684777 1.9184664 9.5 5.0-.04 RATE 2.7039590 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.025 0.025 89 1.68 0.025 0 54740.5020081105_0601-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 23:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org