IOTA/IOTA-ES occultation update for (3940) Larion / TYC 5931-00191-1 event on 2008 Dec 01, 13:16 UT Visible from W USA, Tasmania Summary ------- On 2008 Dec 01 UT, the 10 km diameter asteroid (3940) Larion will occult a 8.4 mag star in the constellation Lepus for observers along a path across W USA, Tasmania. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.7 mag to 15.1 mag (the magnitude of the asteroid) for at most 1.0 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: . The event at a glimpse ---------------------- * Rank: 12 * date and approx. time of event: 2008 Dec 01, 13:06 - 2008 Dec 01, 13:26 UT * magnitude of target star: 8.4 * magnitude drop [mag]: 6.7 * estimated maximum duration [s]: 1.0 * Moon: 13 % sunlit, 134° distance * Sun: 138° distance * rough path description: W USA, Tasmania The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 5.77 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .081 +/- .059) * 1 sigma uncertainty ellipse (major, minor, PA): ( .082", .058", 100° ) * approx speed of asteroid's shadow [km/s]: 10.3611 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5931-00191-1 by 3940 Larion on 2008 Dec 1 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 ' " Longitude Longitude Longitude Longitude -103 25 8 40 0 0 13 6 42 1 249 -9 -103 34 57 -103 15 15 -105 24 52 ... .. .. -106 36 26 39 0 0 13 6 43 3 247 -11 -106 45 15 -106 27 35 -108 24 32 -104 42 39 Latitude Latitude Latitude Latitude -108 0 0 38 31 25 13 6 44 4 246 -12 38 34 23 38 28 28 39 8 35 37 54 14 -109 0 0 38 10 0 13 6 45 5 246 -13 38 12 58 38 7 1 38 47 21 37 32 36 -110 0 0 37 47 47 13 6 46 6 245 -14 37 50 47 37 44 47 38 25 21 37 10 11 -111 0 0 37 24 48 13 6 47 7 244 -14 37 27 48 37 21 47 38 2 34 36 46 59 -112 0 0 37 1 0 13 6 48 8 244 -15 37 4 2 36 57 58 37 39 0 36 22 59 -113 0 0 36 36 24 13 6 49 9 243 -16 36 39 27 36 33 21 37 14 37 35 58 10 -114 0 0 36 10 59 13 6 51 10 243 -16 36 14 3 36 7 55 36 49 25 35 32 31 -115 0 0 35 44 43 13 6 53 11 242 -17 35 47 49 35 41 38 36 23 24 35 6 2 -116 0 0 35 17 37 13 6 55 12 241 -18 35 20 44 35 14 31 35 56 32 34 38 41 -117 0 0 34 49 40 13 6 57 13 241 -18 34 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-52 34 41 13 26 10 25 83 -4 -52 31 58 -52 37 24 -52 0 39 -53 8 44 106 0 0 -52 37 37 13 26 13 24 84 -4 -52 34 54 -52 40 20 -52 3 37 -53 11 39 105 0 0 -52 40 5 13 26 15 24 85 -4 -52 37 23 -52 42 48 -52 6 7 -53 14 5 104 0 0 -52 42 5 13 26 18 23 85 -3 -52 39 23 -52 44 48 -52 8 8 -53 16 3 103 0 0 -52 43 37 13 26 20 23 86 -3 -52 40 55 -52 46 19 -52 9 41 -53 17 34 102 0 0 -52 44 41 13 26 23 22 87 -2 -52 41 59 -52 47 23 -52 10 46 -53 18 37 101 0 0 -52 45 17 13 26 25 21 88 -2 -52 42 35 -52 47 59 -52 11 23 -53 19 13 100 0 0 -52 45 25 13 26 27 21 88 -1 -52 42 43 -52 48 7 -52 11 31 -53 19 21 99 0 0 -52 45 5 13 26 30 20 89 -1 -52 42 23 -52 47 48 -52 11 11 -53 19 1 98 0 0 -52 44 17 13 26 32 20 90 0 -52 41 35 -52 47 0 -52 10 23 -53 18 14 Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 26.0] Data for the target star ------------------------ * name: TYC 5931-00191-1 * constellation : Lepus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 52 37.9628 DE: -15 28 28.199 * position source: mpos:TYC pm:TYC * standard error: RA,DE ["]: ( .022, .021 ) * V mag [mag]: 8.4 * B mag [mag]: 8.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3940) Larion approx. diameter [km]: 10 approx. diameter ["]: .013 distance from Earth [AU]: 1.07900 * orbital information: orbit source: Preston date of fit: 2008 Nov 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 531 number of rejected observations: 19 time covered by the observations: 1951 Jul 08 - 2008 Nov 18 1 sigma uncertainty ellipse (major, minor, PA): 0.079, 0.054, 101° remarks: * orbital elements for (3940) Larion : Mean anomaly = 306.16428883 deg Arg. of pericenter = 304.31847768 deg Long. of node = 194.75831260 deg Inclination = 22.83204898 deg Eccentricity = 0.05679143 Semimajor axis = 1.98794638 AU Perihelion dist = 1.87504806 AU Mag: H = 12.54, G = 0.15 Epoch of elements : MJD 54801.55300000 TDT (2008 Dec 01.553) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Dec 1 3940 Larion 13h 16.9m UT 8.4 5 52 37.963-15 28 28.20TYC 5931-00191-1 8.6 15.1 10 1.0 1.079 -2.283 -34.42 178.1588 -15.465 -21.93 -21.91 13.2820 0.05482 -0.05285 -4.04447 -4.22405 -0.00171 0.00319 2000 305.61819420081130.00000304.318478194.758313 22.8320490.05679143 1.9879464 1.875048112.5 5.00.15 RATE 3.5163900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.082 0.058 100 6.77 0.074 0 54796.5020081201_0191-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 26, 23:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org