IOTA/IOTA-ES occultation update for (3401) Vanphilos / HIP 50604 event on 2008 Feb 05, 09:44 UT Visible from N Brazil, Peru, New Zealand Summary ------- On 2008 Feb 05 UT, the 10 km diameter asteroid (3401) Vanphilos will occult a 8.0 mag star in the constellation Leo for observers along a path across N Brazil, Peru, New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.8 mag to 13.8 mag (the magnitude of the asteroid) for at most 0.8 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 5 * date and approx. time of event: 2008 Feb 05, 09:37 - 2008 Feb 05, 09:52 UT * midpoint of event [JD]: 2454501.90608333 * magnitude of target star: 8.0 * magnitude drop [mag]: 5.8 * estimated maximum duration [s]: 0.8 * Moon: 4 % sunlit, 140° distance * Sun: 162° distance * rough path description: N Brazil, Peru, New Zealand The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 13.11 * 1 sigma uncertainty interval [seconds]: +/- 7.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .174 +/- .163) * 1 sigma uncertainty ellipse (major, minor, PA): ( .212", .111", 132° ) * approx speed of asteroid's shadow [km/s]: 12.3117 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 50604 by 3401 Vanphilos on 2008 Feb 05 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 152 0 0 -48 47 11 9 52 29 0 77 -4 -48 44 5 -48 50 18 .. .. .. .. .. .. 153 0 0 -48 37 50 9 52 29 1 76 -5 -48 34 43 -48 40 56 .. .. .. -50 3 1 154 0 0 -48 28 9 9 52 29 1 75 -6 -48 25 2 -48 31 16 .. .. .. -49 53 30 155 0 0 -48 18 8 9 52 29 2 75 -6 -48 15 0 -48 21 15 .. .. .. -49 43 38 156 0 0 -48 7 47 9 52 28 3 74 -7 -48 4 39 -48 10 55 .. .. .. -49 33 27 157 0 0 -47 57 6 9 52 28 3 73 -8 -47 53 58 -48 0 14 .. .. .. -49 22 57 158 0 0 -47 46 6 9 52 27 4 73 -8 -47 42 58 -47 49 14 .. .. .. -49 12 7 159 0 0 -47 34 45 9 52 27 5 72 -9 -47 31 37 -47 37 54 .. .. .. -49 0 56 160 0 0 -47 23 5 9 52 26 6 71 -10 -47 19 56 -47 26 14 .. .. .. -48 49 27 161 0 0 -47 11 5 9 52 26 6 70 -10 -47 7 55 -47 14 14 .. .. .. -48 37 37 162 0 0 -46 58 44 9 52 25 7 70 -11 -46 55 34 -47 1 54 -45 33 8 -48 25 27 163 0 0 -46 46 3 9 52 24 8 69 -12 -46 42 53 -46 49 14 -45 20 17 -48 12 57 164 0 0 -46 33 2 9 52 23 8 68 -12 -46 29 52 -46 36 13 -45 7 5 -48 0 7 165 0 0 -46 19 41 9 52 22 9 67 -13 -46 16 30 -46 22 53 -44 53 34 -47 46 57 166 0 0 -46 6 0 9 52 20 10 67 -14 -46 2 49 -46 9 12 -44 39 42 -47 33 27 167 0 0 -45 51 59 9 52 19 11 66 -14 -45 48 47 -45 55 11 -44 25 29 -47 19 37 168 0 0 -45 37 37 9 52 18 11 65 -15 -45 34 25 -45 40 49 -44 10 57 -47 5 27 169 0 0 -45 22 55 9 52 16 12 65 -16 -45 19 43 -45 26 8 -43 56 4 -46 50 56 170 0 0 -45 7 53 9 52 15 13 64 -16 -45 4 40 -45 11 6 -43 40 51 -46 36 5 171 0 0 -44 52 31 9 52 13 14 63 -17 -44 49 17 -44 55 44 -43 25 18 -46 20 54 172 0 0 -44 36 48 9 52 11 14 62 -18 -44 33 34 -44 40 2 -43 9 25 -46 5 23 173 0 0 -44 20 46 9 52 9 15 62 -18 -44 17 31 -44 24 0 -42 53 11 -45 49 32 174 0 0 -44 4 23 9 52 7 16 61 -19 -44 1 8 -44 7 38 -42 36 38 -45 33 20 175 0 0 -43 47 40 9 52 5 17 60 -20 -43 44 25 -43 50 55 -42 19 44 -45 16 49 176 0 0 -43 30 37 9 52 3 17 59 -20 -43 27 22 -43 33 53 -42 2 30 -44 59 57 177 0 0 -43 13 14 9 52 0 18 59 -21 -43 9 58 -43 16 30 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17 -129 0 0 -21 32 24 9 46 46 60 5 -50 -21 29 3 -21 35 46 -20 1 42 -23 4 27 -128 0 0 -21 5 48 9 46 38 60 3 -50 -21 2 27 -21 9 9 -19 35 13 -22 37 44 -127 0 0 -20 39 18 9 46 29 61 1 -50 -20 35 57 -20 42 39 -19 8 50 -22 11 6 -126 0 0 -20 12 55 9 46 20 61 359 -50 -20 9 34 -20 16 15 -18 42 35 -21 44 34 -125 0 0 -19 46 39 9 46 11 62 357 -50 -19 43 19 -19 49 59 -18 16 27 -21 18 11 -124 0 0 -19 20 32 9 46 2 62 355 -50 -19 17 12 -19 23 52 -17 50 28 -20 51 55 -123 0 0 -18 54 33 9 45 53 62 353 -50 -18 51 14 -18 57 53 -17 24 37 -20 25 47 -122 0 0 -18 28 44 9 45 44 63 351 -50 -18 25 25 -18 32 4 -16 58 57 -19 59 49 -121 0 0 -18 3 5 9 45 35 63 349 -50 -17 59 46 -18 6 24 -16 33 27 -19 34 1 -120 0 0 -17 37 37 9 45 26 63 346 -50 -17 34 19 -17 40 56 -16 8 8 -19 8 24 -119 0 0 -17 12 20 9 45 17 63 344 -49 -17 9 2 -17 15 39 -15 43 0 -18 42 57 -118 0 0 -16 47 15 9 45 8 63 342 -49 -16 43 57 -16 50 33 -15 18 4 -18 17 43 -117 0 0 -16 22 23 9 44 59 64 340 -49 -16 19 5 -16 25 40 -14 53 21 -17 52 40 -116 0 0 -15 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0 0 - 1 58 23 9 37 22 15 279 1 - 1 55 21 - 2 1 25 - 0 36 23 - 3 21 22 - 49 0 0 - 2 0 18 9 37 20 14 279 2 - 1 57 16 - 2 3 19 - 0 38 15 - 3 23 19 - 48 0 0 - 2 2 40 9 37 17 13 279 3 - 1 59 39 - 2 5 42 - 0 40 36 - 3 25 44 - 47 0 0 - 2 5 32 9 37 15 12 279 4 - 2 2 30 - 2 8 34 - 0 43 25 - 3 28 38 - 46 0 0 - 2 8 52 9 37 13 11 279 5 - 2 5 50 - 2 11 54 - 0 46 43 - 3 32 1 - 45 0 0 - 2 12 41 9 37 11 10 279 6 - 2 9 39 - 2 15 44 - 0 50 29 - 3 35 53 - 44 0 0 - 2 16 59 9 37 9 10 279 7 - 2 13 57 - 2 20 2 - 0 54 43 - 3 40 15 - 43 0 0 - 2 21 46 9 37 8 9 279 8 - 2 18 43 - 2 24 48 - 0 59 26 - 3 45 5 - 42 0 0 - 2 27 1 9 37 6 8 279 9 - 2 23 58 - 2 30 4 - 1 4 37 - 3 50 25 - 41 0 0 - 2 32 45 9 37 5 7 279 10 - 2 29 42 - 2 35 48 .. .. .. - 3 56 14 - 40 0 0 - 2 38 58 9 37 4 6 279 11 - 2 35 55 - 2 42 1 .. .. .. - 4 2 31 - 39 0 0 - 2 45 40 9 37 3 5 279 12 - 2 42 37 - 2 48 44 .. .. .. - 4 9 19 - 38 0 0 - 2 52 51 9 37 3 4 279 13 - 2 49 48 - 2 55 55 .. .. .. - 4 16 35 - 37 0 0 - 3 0 31 9 37 2 3 279 14 - 2 57 27 - 3 3 35 .. .. .. - 4 24 21 - 36 0 0 - 3 8 40 9 37 2 2 279 15 - 3 5 36 - 3 11 44 .. .. .. - 4 32 35 - 35 0 0 - 3 17 17 9 37 1 0 279 16 - 3 14 13 - 3 20 21 .. .. .. - 4 41 19 Data for the target star ------------------------ * name: HIP 50604 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 20 14.0584 DE: +08 36 38.443 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .017, .012 ) * V mag [mag]: 8.0 * B mag [mag]: 9.5 * Apparent position with proper motion RA(deg): 155.1733678149 DE(deg): 8.5677266564 * Equation of equinoxes (radians) : 0.000046185992417 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3401) Vanphilos approx. diameter [km]: 10 approx. diameter ["]: .015 distance from Earth [AU]: 0.90500 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: MPC (via Astdys) number of used observations: 274 number of rejected observations: 7 time covered by the observations: 1946 Feb 19 - 2007 Nov 18 1 sigma uncertainty ellipse (major, minor, PA): 0.211, 0.110, 132° remarks: * orbital elements for (3401) Vanphilos : Mean anomaly = 37.40178687 deg Arg. of pericenter = 108.76550281 deg Long. of node = 322.43324126 deg Inclination = 21.80625487 deg Eccentricity = 0.36020294 Semimajor axis = 2.36697063 AU Perihelion dist = 1.51438086 AU Mag: H = 12.08, G = 0.15 Epoch of elements : MJD 54501.40600000 TDT (2008 Feb 05.406) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 05 3401 Vanphilos 9h 44.8m UT 8.0 10 20 14.058 8 36 38.44HIP 50604 9.5 13.8 10 0.8 0.905 -4.195 -26.34 -126.058 8.617 37.30 -16.05 9.7460 .17322 -.40837 -6.39878 -2.71019 -0.00148 0.00073 2000 37.02124712008 2 4.00000108.765503322.433241 21.8062550.360202942.366970631.5143808612.05 0.15 RATE 2.7065420 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.212 0.111 131.714.110 0.197 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 04, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org