IOTA/IOTA-ES occultation update for (1512) Oulu / UCAC2 41020481 event on 2008 Feb 01, 04:47 UT Visible from Africa, USA, Canada Summary ------- On 2008 Feb 01 UT, the 83 km diameter asteroid (1512) Oulu will occult a 11.8 mag star in the constellation Cancer for observers along a path across Africa, USA, Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 15.5 mag (the magnitude of the asteroid) for at most 5.1 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: 74 * date and approx. time of event: 2008 Feb 01, 04:40 - 2008 Feb 01, 04:53 UT * midpoint of event [JD]: 2454497.69927083 * magnitude of target star: 11.8 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 5.1 * Moon: 32 % sunlit, 118° distance * Sun: 171° distance * rough path description: Africa, USA, Canada The occultation path -------------------- * approximate projected width [km]: 86 * 1 sigma uncertainty interval [path widths]: +/- 0.77 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .038 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .027", 103° ) * approx speed of asteroid's shadow [km/s]: 16.3149 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 41020481 by 1512 Oulu on 2008 Feb 01 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 -176 0 0 23 54 8 4 53 14 0 61 7 24 20 38 .. .. .. 25 1 33 .. .. .. -175 0 0 24 24 11 4 53 14 1 62 6 24 50 39 23 57 48 25 31 31 .. .. .. -174 0 0 24 53 57 4 53 14 2 62 5 25 20 22 24 27 35 26 1 11 23 47 6 -173 0 0 25 23 24 4 53 14 3 63 4 25 49 47 24 57 5 26 30 31 24 16 39 -172 0 0 25 52 32 4 53 13 4 63 3 26 18 52 25 26 15 26 59 33 24 45 53 -171 0 0 26 21 20 4 53 13 5 63 2 26 47 37 25 55 6 27 28 14 25 14 48 -170 0 0 26 49 47 4 53 12 6 64 1 27 16 2 26 23 36 27 56 35 25 43 22 -169 0 0 27 17 54 4 53 11 7 64 0 27 44 6 26 51 46 28 24 34 26 11 36 -168 0 0 27 45 40 4 53 10 8 65 -1 28 11 49 27 19 34 28 52 13 26 39 29 -167 0 0 28 13 4 4 53 9 9 65 -2 28 39 10 27 47 1 29 19 29 27 7 1 -166 0 0 28 40 6 4 53 8 10 66 -3 29 6 9 28 14 6 29 46 23 27 34 11 -165 0 0 29 6 46 4 53 7 11 66 -4 29 32 46 28 40 49 30 12 55 28 0 58 -164 0 0 29 33 3 4 53 5 12 67 -5 29 58 59 29 7 9 30 39 4 28 27 23 -163 0 0 29 58 56 4 53 4 13 67 -6 30 24 50 29 33 6 31 4 49 28 53 25 -162 0 0 30 24 27 4 53 2 14 68 -7 30 50 17 29 58 40 31 30 11 29 19 4 -161 0 0 30 49 33 4 53 0 15 68 -8 31 15 20 30 23 50 31 55 9 29 44 19 -160 0 0 31 14 16 4 52 59 16 69 -9 31 40 0 30 48 36 32 19 43 30 9 10 -159 0 0 31 38 35 4 52 57 17 69 -10 32 4 15 31 12 58 32 43 53 30 33 38 -158 0 0 32 2 29 4 52 55 18 70 -11 32 28 6 31 36 56 33 7 39 30 57 41 -157 0 0 32 25 59 4 52 53 19 70 -11 32 51 32 32 0 30 33 31 0 31 21 20 -156 0 0 32 49 5 4 52 51 20 71 -12 33 14 34 32 23 39 33 53 56 31 44 34 -155 0 0 33 11 45 4 52 48 21 72 -13 33 37 11 32 46 23 34 16 27 32 7 24 -154 0 0 33 34 1 4 52 46 21 72 -14 33 59 23 33 8 42 34 38 34 32 29 48 -153 0 0 33 55 52 4 52 44 22 73 -15 34 21 10 33 30 36 35 0 15 32 51 48 -152 0 0 34 17 17 4 52 41 23 73 -16 34 42 32 33 52 5 35 21 32 33 13 23 -151 0 0 34 38 18 4 52 39 24 74 -17 35 3 29 34 13 9 35 42 23 33 34 32 -150 0 0 34 58 53 4 52 36 25 75 -18 35 24 1 34 33 48 36 2 49 33 55 17 -149 0 0 35 19 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11 56 2 9 41 36 7 0 0 10 16 19 4 40 54 16 294 -18 10 42 47 9 49 55 11 23 40 9 9 22 8 0 0 9 44 7 4 40 52 14 295 -17 10 10 33 9 17 44 10 51 23 8 37 13 9 0 0 9 12 0 4 40 50 13 295 -16 9 38 25 8 45 39 10 19 12 8 5 11 10 0 0 8 40 1 4 40 49 12 295 -15 9 6 24 8 13 42 9 47 8 7 33 17 11 0 0 8 8 10 4 40 47 11 295 -14 8 34 30 7 41 53 9 15 11 7 1 30 12 0 0 7 36 27 4 40 45 10 295 -13 8 2 46 7 10 13 8 43 24 6 29 54 13 0 0 7 4 55 4 40 44 9 295 -12 7 31 11 6 38 42 8 11 45 5 58 27 14 0 0 6 33 33 4 40 43 8 296 -11 6 59 47 6 7 23 7 40 18 5 27 11 15 0 0 6 2 24 4 40 42 7 296 -10 6 28 35 5 36 16 7 9 2 4 56 8 16 0 0 5 31 26 4 40 41 6 296 -8 5 57 35 5 5 21 6 37 57 4 25 17 17 0 0 5 0 42 4 40 41 4 296 -7 5 26 48 4 34 39 6 7 6 3 54 39 18 0 0 4 30 12 4 40 40 3 296 -6 4 56 15 4 4 12 5 36 29 3 24 16 19 0 0 3 59 57 4 40 40 2 296 -5 4 25 57 3 34 0 5 6 7 .. .. .. 20 0 0 3 29 58 4 40 39 1 296 -4 3 55 55 3 4 4 4 36 1 .. .. .. 21 0 0 .. .. .. .. .. .. .. .. .. 3 26 10 .. .. .. 4 6 10 .. .. .. Data for the target star ------------------------ * name: UCAC2 41020481 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 41 10.7847 DE: +26 06 45.018 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .017 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 130.4251478270 DE(deg): 26.0828423195 * Equation of equinoxes (radians) : 0.000044321160055 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1512) Oulu approx. diameter [km]: 83 approx. diameter ["]: .035 distance from Earth [AU]: 3.23900 * orbital information: orbit source: Preston date of fit: 2007 Dec 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 900 number of rejected observations: 36 time covered by the observations: 1939 Mar 18 - 2007 Oct 23 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.021, 108° remarks: * orbital elements for (1512) Oulu : Mean anomaly = 252.06281010 deg Arg. of pericenter = 240.23042323 deg Long. of node = 10.29807690 deg Inclination = 6.49388326 deg Eccentricity = 0.15275727 Semimajor axis = 3.95094751 AU Perihelion dist = 3.34741157 AU Mag: H = 9.50, G = 0.15 Epoch of elements : MJD 54497.19900000 TDT (2008 Feb 01.199) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 01 1512 Oulu 4h 47.0m UT 11.8 8 41 10.785 26 6 45.02UCAC2 41020481 0.0 15.5 83 5.1 3.239 -1.818 5.03 -72.224 26.111 111.63 -17.28 4.7825 .05199 .25304 -9.01975 1.85542 0.00036 -0.00092 2000 251.1593172008 125.00000240.230423 10.298077 6.4938830.152757273.950947513.347411579.625 0.15 RATE 1.2550250 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.038 0.027 102.7 1.770 0.027 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 22, 20:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org