IOTA/IOTA-ES occultation update for (657) Gunlod / UCAC2 43078023 event on 2008 Dec 04, 04:15 UT Visible from Russia, Scandanavia, W Canada, NW USA Summary ------- On 2008 Dec 04 UT, the 40 km diameter asteroid (657) Gunlod will occult a 11.9 mag star in the constellation Auriga for observers along a path across Russia, Scandanavia, W Canada, NW USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.7 mag (the magnitude of the asteroid) for at most 3.8 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: 49 * date and approx. time of event: 2008 Dec 04, 04:08 - 2008 Dec 04, 04:23 UT * midpoint of event [JD]: 2454804.6773625 * magnitude of target star: 11.9 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 3.8 * Moon: 33 % sunlit, 128° distance * Sun: 159° distance * rough path description: Russia, Scandanavia, W Canada, NW USA The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 1.31 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .043) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .043", 95° ) * approx speed of asteroid's shadow [km/s]: 10.6582 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 43078023 by 657 Gunlod on 2008 Dec 4 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 -155 0 0 26 47 2 4 23 12 1 54 -13 27 4 12 26 29 57 27 49 36 .. .. .. -154 0 0 27 27 46 4 23 11 2 54 -14 27 45 2 27 10 36 28 30 40 .. .. .. -153 0 0 28 8 51 4 23 11 3 55 -15 28 26 12 27 51 35 29 12 5 .. .. .. -152 0 0 28 50 14 4 23 10 4 55 -16 29 7 41 28 32 53 29 53 48 .. .. .. -151 0 0 29 31 55 4 23 8 5 56 -17 29 49 27 29 14 28 30 35 49 28 29 10 -150 0 0 30 13 51 4 23 7 6 56 -18 30 31 28 29 56 19 31 18 5 29 10 48 -149 0 0 30 56 1 4 23 5 7 57 -19 31 13 43 30 38 24 32 0 34 29 52 39 -148 0 0 31 38 23 4 23 3 9 57 -20 31 56 11 31 20 41 32 43 16 30 34 43 -147 0 0 32 20 55 4 23 1 10 58 -21 32 38 48 32 3 8 33 26 7 31 16 58 -146 0 0 33 3 36 4 22 58 11 58 -22 33 21 34 32 45 44 34 9 7 31 59 22 -145 0 0 33 46 24 4 22 55 12 59 -23 34 4 27 33 28 28 34 52 13 32 41 53 -144 0 0 34 29 17 4 22 52 13 59 -24 34 47 25 34 11 16 35 35 23 33 24 29 -143 0 0 35 12 14 4 22 48 14 60 -25 35 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54 4 9 19 29 286 -10 58 24 16 57 47 39 59 12 56 57 0 17 43 0 0 57 37 30 4 9 14 28 287 -10 57 55 57 57 19 10 58 44 48 56 31 38 44 0 0 57 8 28 4 9 9 28 288 -9 57 26 59 56 50 4 58 16 1 56 2 21 45 0 0 56 38 47 4 9 5 27 289 -8 56 57 22 56 20 19 57 46 35 55 32 26 46 0 0 56 8 28 4 9 0 26 290 -8 56 27 6 55 49 56 57 16 30 55 1 54 47 0 0 55 37 30 4 8 56 26 291 -7 55 56 12 55 18 55 56 45 45 54 30 43 48 0 0 55 5 54 4 8 52 25 291 -6 55 24 39 54 47 15 56 14 22 53 58 55 49 0 0 54 33 39 4 8 47 24 292 -5 54 52 28 54 14 58 55 42 19 53 26 30 50 0 0 54 0 47 4 8 43 23 293 -4 54 19 38 53 42 2 55 9 37 52 53 27 51 0 0 53 27 17 4 8 39 23 294 -4 53 46 11 53 8 30 54 36 17 52 19 48 52 0 0 52 53 9 4 8 35 22 295 -3 53 12 6 52 34 20 54 2 18 51 45 32 53 0 0 52 18 25 4 8 30 21 296 -2 52 37 24 51 59 33 53 27 42 51 10 40 54 0 0 51 43 5 4 8 26 20 297 -1 52 2 5 51 24 11 52 52 28 50 35 14 55 0 0 51 7 9 4 8 23 19 298 0 51 26 11 50 48 14 52 16 38 49 59 12 Uncertainty in time = +/- 6 secs [Prediction of 2008 Oct 30.0] Data for the target star ------------------------ * name: UCAC2 43078023 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 05 25.8596 DE: +32 21 58.342 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .041, .038 ) * V mag [mag]: 11.9 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 91.5139156966 DE(deg): 32.3662010036 * Equation of equinoxes (radians) : 0.000052423959791 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (657) Gunlod approx. diameter [km]: 40 approx. diameter ["]: .033 distance from Earth [AU]: 1.67800 * orbital information: orbit source: Preston date of fit: 2008 Oct 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 755 number of rejected observations: 52 time covered by the observations: 1908 Jan 23 - 2008 Oct 17 1 sigma uncertainty ellipse (major, minor, PA): 0.036, 0.020, 101° remarks: * orbital elements for (657) Gunlod : Mean anomaly = 274.29617913 deg Arg. of pericenter = 244.83439808 deg Long. of node = 297.75488026 deg Inclination = 10.22173891 deg Eccentricity = 0.11504207 Semimajor axis = 2.61060203 AU Perihelion dist = 2.31027297 AU Mag: H = 10.99, G = 0.15 Epoch of elements : MJD 54804.17700000 TDT (2008 Dec 04.177) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 4 657 Gunlod 4h 15.4m UT 11.9 6 5 25.860 32 21 58.34UCAC2 43078023 0.0 14.7 40 3.8 1.678 -2.470 -3.95 -45.8484 32.368 113.71 -22.28 4.2567 -0.07758 0.61865 -5.96856 -0.75209 -0.00189 -0.00085 2000 273.32016220081130.00000244.834398297.754880 10.2217390.11504207 2.6106020 2.310273010.9 5.00.15 RATE 2.3366460 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.043 95 2.31 0.043 0 54769.5020081204_078023 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 30, 23:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org