IOTA/IOTA-ES occultation update for (351) Yrsa / UCAC2 38927699 event on 2008 Jan 03, 22:18 UT Visible from S Africa, NE Brazil Summary ------- On 2008 Jan 03 UT, the 40 km diameter asteroid (351) Yrsa will occult a 11.7 mag star in the constellation Taurus for observers along a path across S Africa, NE Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 12.4 mag (the magnitude of the asteroid) for at most 4.3 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 79 * date and approx. time of event: 2008 Jan 03, 22:08 - 2008 Jan 03, 22:28 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 1.2 * estimated maximum duration [s]: 4.3 * Moon: 18 % sunlit, 151° distance * Sun: 157° distance * rough path description: S Africa, NE Brazil The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.69 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .024", 83° ) * approx speed of asteroid's shadow [km/s]: 9.1972 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 38927699 by 351 Yrsa on 2008 Jan 03 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 - 86 0 0 -10 57 12 22 28 25 0 69 23 -10 43 39 -11 10 46 .. .. .. -11 29 33 - 85 0 0 -10 35 8 22 28 25 1 69 21 -10 21 38 -10 48 39 .. .. .. -11 7 23 - 84 0 0 -10 13 34 22 28 25 2 69 20 -10 0 6 -10 27 3 .. .. .. -10 45 43 - 83 0 0 - 9 52 30 22 28 24 4 69 19 - 9 39 5 -10 5 57 .. .. .. -10 24 34 - 82 0 0 - 9 31 57 22 28 23 5 68 18 - 9 18 35 - 9 45 22 - 9 0 11 -10 3 55 - 81 0 0 - 9 11 55 22 28 22 6 68 17 - 8 58 35 - 9 25 17 - 8 40 14 - 9 43 48 - 80 0 0 - 8 52 24 22 28 20 7 68 16 - 8 39 7 - 9 5 44 - 8 20 49 - 9 24 11 - 79 0 0 - 8 33 24 22 28 18 8 68 15 - 8 20 9 - 8 46 42 - 8 1 54 - 9 5 6 - 78 0 0 - 8 14 56 22 28 16 9 68 14 - 8 1 42 - 8 28 11 - 7 43 31 - 8 46 32 - 77 0 0 - 7 56 59 22 28 14 10 68 13 - 7 43 47 - 8 10 12 - 7 25 39 - 8 28 30 - 76 0 0 - 7 39 33 22 28 12 11 68 12 - 7 26 24 - 7 52 44 - 7 8 18 - 8 10 59 - 75 0 0 - 7 22 39 22 28 9 12 67 11 - 7 9 32 - 7 35 48 - 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-12 -44 32 47 -45 1 54 .. .. .. -45 22 5 Data for the target star ------------------------ * name: UCAC2 38927699 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 17 35.1363 DE: +20 21 39.938 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .020 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (351) Yrsa approx. diameter [km]: 40 approx. diameter ["]: .037 distance from Earth [AU]: 1.48000 * orbital information: orbit source: Preston date of fit: 2007 Dec 18 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 669 number of rejected observations: 88 time covered by the observations: 1905 Sep 23 - 2007 Dec 05 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.014, 77° remarks: * orbital elements for (351) Yrsa : Mean anomaly = 328.99034267 deg Arg. of pericenter = 31.55747181 deg Long. of node = 99.44016494 deg Inclination = 9.19408098 deg Eccentricity = 0.15641292 Semimajor axis = 2.76480614 AU Perihelion dist = 2.33235474 AU Mag: H = 8.85, G = 0.15 Epoch of elements : MJD 54468.92900000 TDT (2008 Jan 03.929) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 03 351 Yrsa 22h 18.5m UT 11.7 5 17 35.136 20 21 39.94UCAC2 38927699 0.0 12.4 40 4.3 1.480 -2.079 9.80 1.867 20.358 206.50 -22.81 22.3075 -.16061 -.47796 -4.92230 1.64899 0.00221 0.00042 2000 327.07604320071226.00000 31.557472 99.440165 9.1940810.156412922.764806142.332354748.985 0.15 RATE 2.1439130 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.031 0.024 83.0 1.690 0.026 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Dec 19, 04:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org