IOTA/IOTA-ES occultation update for (1867) Deiphobus / TYC 7346-00177-1 event on 2009 Sep 04, 10:54 UT Visible from Summary ------- On 2009 Sep 04 UT, the 123 km diameter asteroid (1867) Deiphobus will occult a 10.7 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 16.2 mag (the magnitude of the asteroid) for at most 7.7 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: 62 * date and approx. time of event: 2009 Sep 04, 10:50 - 2009 Sep 04, 10:57 UT * magnitude of target star: 10.7 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 7.7 * Moon: 100 % sunlit, 87° distance * Sun: 91° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 219 * 1 sigma uncertainty interval [path widths]: +/- 0.99 * 1 sigma uncertainty interval [seconds]: +/- 11.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .059 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .061", .032", 75° ) * approx speed of asteroid's shadow [km/s]: 15.9796 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7346-00177-1 by 1867 Deiphobus on 2009 Sep 4 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude - 73 21 24 -63 25 51 10 50 29 5 178 -6 - 72 11 7 -67 6 47 ... .. .. .. .. .. - 69 23 32 -71 39 59 ... .. .. .. .. .. - 74 45 56 -67 7 24 10 50 35 9 179 -7 - 73 44 59 -69 42 50 - 75 36 15 -63 20 50 - 71 8 32 -73 34 32 ... .. .. .. .. .. - 76 38 14 -69 38 39 10 50 41 11 180 -8 - 75 44 56 -71 47 28 - 77 20 16 -66 58 56 - 73 21 52 -75 14 39 ... .. .. .. .. .. - 78 55 52 -71 38 56 10 50 46 13 182 -9 - 78 11 46 -73 32 33 - 79 29 13 -69 26 30 - 76 7 32 -76 43 22 - 79 58 2 -62 33 20 - 81 39 50 -73 19 39 10 50 52 15 185 -9 - 81 7 54 -75 3 14 - 82 2 12 -71 22 55 - 79 30 51 -78 2 17 - 82 17 25 -66 17 20 - 84 52 7 -74 45 45 10 50 58 17 188 -10 - 84 36 21 -76 22 5 - 85 0 16 -72 59 30 - 83 38 3 -79 12 3 - 84 54 1 -68 40 45 - 88 34 48 -75 59 43 10 51 4 18 191 -11 - 88 40 15 -77 30 22 - 88 24 47 -74 21 12 - 88 35 41 -80 12 46 - 87 50 28 -70 30 55 - 92 49 37 -77 2 49 10 51 10 19 195 -11 - 93 22 4 -78 28 39 - 92 16 54 -75 30 28 - 94 29 7 -81 4 4 - 91 7 41 -72 0 13 - 97 37 6 -77 55 38 10 51 15 20 199 -12 - 98 42 41 -79 17 2 - 96 36 57 -76 28 38 -101 20 14 -81 45 12 - 94 45 55 -73 13 53 -102 55 54 -78 38 23 10 51 21 21 204 -13 -104 40 7 -79 55 22 -101 23 57 -77 16 22 -109 4 8 -82 15 21 - 98 44 38 -74 14 40 -108 41 58 -79 11 7 10 51 27 22 210 -13 -111 8 25 -80 23 24 -106 35 4 -77 54 2 -117 26 29 -82 33 49 -103 2 20 -75 4 3 -114 48 15 -79 33 52 10 51 33 23 215 -14 -117 57 21 -80 41 3 -112 5 15 -78 21 53 -126 4 2 -82 40 25 -107 36 19 -75 43 0 -121 4 56 -79 46 48 10 51 38 24 221 -15 -124 53 13 -80 48 29 -117 47 26 -78 40 9 -134 29 36 -82 35 37 -112 22 37 -76 12 11 -127 20 45 -79 50 21 10 51 44 25 227 -15 -131 41 11 -80 46 14 -123 33 3 -78 49 13 -142 19 26 -82 20 38 -117 16 16 -76 32 10 -133 24 40 -79 45 11 10 51 50 26 232 -16 -138 7 58 -80 35 12 -129 13 12 -78 49 40 -149 18 38 -81 57 5 -122 11 35 -76 43 29 -139 7 33 -79 32 11 10 51 56 26 238 -17 -144 4 3 -80 16 30 -134 39 45 -78 42 13 -155 21 46 -81 26 40 -127 2 47 -76 46 48 -144 23 11 -79 12 23 10 52 2 27 242 -17 -149 24 14 -79 51 19 -139 46 24 -78 27 45 -160 30 30 -80 50 57 -131 44 34 -76 42 44 -149 8 23 -78 46 49 10 52 7 28 247 -18 -154 7 13 -79 20 51 -144 28 59 -78 7 9 -164 50 15 -80 11 14 -136 12 32 -76 32 5 -153 22 32 -78 16 29 10 52 13 28 250 -19 -158 14 23 -78 46 7 -148 45 30 -77 41 22 -168 27 49 -79 28 35 -140 23 33 -76 15 34 -157 6 48 -77 42 16 10 52 19 29 253 -19 -161 48 40 -78 8 3 -152 35 45 -77 11 13 -171 29 54 -78 43 44 -144 15 40 -75 53 56 -160 23 26 -77 4 55 10 52 25 29 256 -20 -164 53 41 -77 27 20 -156 0 41 -76 37 29 -174 2 28 -77 57 19 -147 48 7 -75 27 56 -163 15 9 -76 25 4 10 52 30 30 259 -21 -167 33 7 -76 44 34 -159 2 3 -76 0 48 -176 10 36 -77 9 45 -151 0 57 -74 58 11 -165 44 47 -75 43 13 10 52 36 30 260 -21 -169 50 26 -76 0 14 -161 41 58 -75 21 43 -177 58 29 -76 21 21 -153 54 54 -74 25 17 -167 55 3 -74 59 48 10 52 42 31 262 -22 -171 48 44 -75 14 40 -164 2 37 -74 40 42 -179 29 31 -75 32 22 -156 31 5 -73 49 43 -169 48 24 -74 15 7 10 52 48 31 263 -23 -173 30 43 -74 28 9 -166 6 11 -73 58 6 179 13 31 -74 42 59 -158 50 50 -73 11 56 -171 27 2 -73 29 27 10 52 54 32 264 -23 -174 58 42 -73 40 55 -167 54 38 -73 14 14 178 8 23 -73 53 19 -160 55 35 -72 32 18 -172 52 53 -72 43 0 10 52 59 32 265 -24 -176 14 37 -72 53 7 -169 29 46 -72 29 21 177 13 17 -73 3 29 -162 46 43 -71 51 7 -174 7 34 -71 55 56 10 53 5 32 266 -25 -177 20 7 -72 4 54 -170 53 12 -71 43 37 176 26 43 -72 13 32 -164 25 36 -71 8 38 -175 12 32 -71 8 22 10 53 11 33 266 -26 -178 16 36 -71 16 21 -172 6 18 -70 57 13 175 47 29 -71 23 33 -165 53 29 -70 25 4 -176 8 57 -70 20 24 10 53 17 33 267 -26 -179 5 14 -70 27 33 -173 10 19 -70 10 16 175 14 34 -70 33 32 -167 11 28 -69 40 34 -176 57 53 -69 32 8 10 53 22 33 267 -27 -179 46 58 -69 38 34 -174 6 17 -69 22 52 174 47 9 -69 43 33 -168 20 36 -68 55 19 -177 40 12 -68 43 37 10 53 28 33 267 -28 179 37 20 -68 49 26 -174 55 7 -68 35 5 174 24 33 -68 53 35 -169 21 46 -68 9 24 -178 16 39 -67 54 54 10 53 34 33 267 -28 179 6 58 -68 0 12 -175 37 35 -67 46 59 174 6 10 -68 3 39 -170 15 48 -67 22 56 -178 47 53 -67 6 0 10 53 40 34 267 -29 178 41 20 -67 10 53 -176 14 24 -66 58 38 173 51 32 -67 13 46 -171 3 23 -66 35 58 -179 14 27 -66 16 59 10 53 46 34 267 -30 178 19 57 -66 21 30 -176 46 8 -66 10 3 173 40 14 -66 23 57 -171 45 9 -65 48 35 -179 36 49 -65 27 49 10 53 51 34 267 -31 178 2 21 -65 32 3 -177 13 18 -65 21 17 173 31 56 -65 34 9 -172 21 40 -65 0 50 -179 55 25 -64 38 33 10 53 57 34 266 -31 177 48 10 -64 42 33 -177 36 19 -64 32 19 173 26 19 -64 44 25 -172 53 23 -64 12 44 179 49 25 -63 49 11 10 54 3 34 266 -32 177 37 5 -63 53 0 -177 55 35 -63 43 13 173 23 7 -63 54 42 -173 20 45 -63 24 20 179 37 22 -62 59 43 10 54 9 34 265 -33 177 28 48 -63 3 24 -178 11 26 -62 53 56 173 22 10 -63 5 0 -173 44 8 -62 35 39 179 28 11 -62 10 10 10 54 14 34 265 -34 177 23 7 -62 13 45 -178 24 10 -62 4 31 173 23 13 -62 15 20 -174 3 52 -61 46 42 179 21 37 -61 20 30 10 54 20 34 265 -34 177 19 47 -61 24 2 -178 34 0 -61 14 57 173 26 10 -61 25 39 -174 20 12 -60 57 29 179 17 29 -60 30 43 10 54 26 34 264 -35 177 18 39 -60 34 15 -178 41 11 -60 25 14 173 30 50 -60 35 58 -174 33 26 -60 8 1 179 15 35 -59 40 50 10 54 32 34 263 -36 177 19 34 -59 44 23 -178 45 53 -59 35 22 173 37 7 -59 46 15 -174 43 45 -59 18 17 179 15 48 -58 50 49 10 54 38 34 263 -37 177 22 22 -58 54 25 -178 48 17 -58 45 19 173 44 55 -58 56 29 -174 51 21 -58 28 18 179 18 0 -58 0 39 10 54 43 33 262 -37 177 26 57 -58 4 21 -178 48 31 -57 55 6 173 54 9 -58 6 40 -174 56 25 -57 38 3 179 22 2 -57 10 20 10 54 49 33 262 -38 177 33 13 -57 14 8 -178 46 43 -57 4 41 174 4 43 -57 16 45 -174 59 4 -56 47 31 179 27 51 -56 19 50 10 54 55 33 261 -39 177 41 6 -56 23 48 -178 42 59 -56 14 4 174 16 35 -56 26 46 -174 59 27 -55 56 41 179 35 21 -55 29 9 10 55 1 33 260 -40 177 50 30 -55 33 17 -178 37 24 -55 23 13 174 29 41 -55 36 39 -174 57 40 -55 5 33 179 44 28 -54 38 15 10 55 6 33 260 -41 178 1 22 -54 42 36 -178 30 3 -54 32 7 174 43 58 -54 46 23 -174 53 48 -54 14 6 179 55 8 -53 47 7 10 55 12 32 259 -42 178 13 39 -53 51 42 -178 21 0 -53 40 45 174 59 25 -53 55 58 -174 47 55 -53 22 17 -179 52 40 -52 55 43 10 55 18 32 258 -42 178 27 20 -53 0 33 -178 10 17 -52 49 5 175 15 59 -53 5 22 -174 40 5 -52 30 5 -179 39 0 -52 4 1 10 55 24 32 258 -43 178 42 21 -52 9 10 -177 57 58 -51 57 6 175 33 41 -52 14 34 -174 30 21 -51 37 28 -179 23 52 -51 12 1 10 55 30 31 257 -44 178 58 42 -51 17 29 -177 44 3 -51 4 45 175 52 28 -51 23 31 -174 18 45 -50 44 23 -179 7 18 -50 19 39 10 55 35 31 256 -45 179 16 23 -50 25 28 -177 28 33 -50 12 0 176 12 21 -50 32 12 -174 5 17 -49 50 50 -178 49 17 -49 26 53 10 55 41 31 255 -46 179 35 23 -49 33 7 -177 11 30 -49 18 49 176 33 20 -49 40 36 -173 49 57 -48 56 44 -178 29 49 -48 33 41 10 55 47 30 255 -47 179 55 42 -48 40 22 -176 52 51 -48 25 10 176 55 25 -48 48 39 -173 32 46 -48 2 3 -178 8 54 -47 40 1 10 55 53 30 254 -48 -179 42 39 -47 47 10 -176 32 37 -47 30 59 177 18 37 -47 56 21 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28 2 -30 7 49 -164 11 3 -28 42 53 -171 59 13 -31 2 26 -157 55 49 -25 58 15 -164 56 48 -27 56 12 10 57 37 12 240 -69 -167 9 25 -28 41 44 -162 20 40 -26 54 57 -170 53 46 -29 46 2 ... .. .. .. .. .. -163 4 45 -26 7 55 10 57 42 10 239 -71 -165 37 3 -27 6 49 -159 45 1 -24 37 49 -169 40 43 -28 24 46 ... .. .. .. .. .. -160 27 14 -23 50 20 10 57 48 6 238 -73 -163 42 22 -25 17 30 ... .. .. .. .. .. -168 17 24 -26 56 54 ... .. .. .. .. .. Uncertainty in time = +/- 13 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 7346-00177-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 40 13.7169 DE: -31 47 19.449 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 10.7 * B mag [mag]: 12.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1867) Deiphobus approx. diameter [km]: 123 approx. diameter ["]: .035 distance from Earth [AU]: 4.79300 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 683 number of rejected observations: 11 time covered by the observations: 1971 Mar 03 - 2008 Feb 07 1 sigma uncertainty ellipse (major, minor, PA): 0.057, 0.024, 73° remarks: * orbital elements for (1867) Deiphobus : Mean anomaly = 340.92371283 deg Arg. of pericenter = 359.96097996 deg Long. of node = 283.69896619 deg Inclination = 26.90872959 deg Eccentricity = 0.04488425 Semimajor axis = 5.13140105 AU Perihelion dist = 4.90108195 AU Mag: H = 8.34, G = 0.15 Epoch of elements : MJD 55078.45400000 TDT (2009 Sep 04.454) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 4 1867 Deiphobus 10h 54.1m UT 10.7 16 40 13.717-31 47 19.45TYC 7346-00177-1 12.0 16.2 123 7.7 4.793 1.097 8.86 102.8241 -31.792 16.22 7.04 10.9024 0.44295 -0.69863 7.61707 4.82995 0.00579 -0.00079 2000 340.2068892009 827.00000359.960980283.698966 26.9087300.04488425 5.1314011 4.9010820 8.6 5.00.15 RATE 0.8479110 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.061 0.032 75 1.99 0.035 0 54545.5020090904_0177-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 12:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org