IOTA/IOTA-ES occultation update for (2271) Kiso / TYC 1358-00822-1 event on 2010 Feb 16, 04:50 UT Visible from USA Summary ------- On 2010 Feb 16 UT, the 32 km diameter asteroid (2271) Kiso will occult a 11.2 mag star in the constellation Gemini for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.6 mag to 15.8 mag (the magnitude of the asteroid) for at most 4.6 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: 37 * date and approx. time of event: 2010 Feb 16, 04:37 - 2010 Feb 16, 05:02 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 4.6 * estimated maximum duration [s]: 4.6 * Moon: 4 % sunlit, 117° distance * Sun: 140° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 1.80 * 1 sigma uncertainty interval [seconds]: +/- 10.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .049 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .049", .037", 94° ) * approx speed of asteroid's shadow [km/s]: 6.9989 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1358-00822-1 by 2271 Kiso on 2010 Feb 16 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 49 4 16 5 2 23 33 96 0 49 13 45 48 54 48 49 48 0 48 20 46 -175 0 0 49 10 59 5 2 17 34 96 -1 49 20 28 49 1 31 49 54 40 48 27 32 -174 0 0 49 17 22 5 2 11 34 97 -2 49 26 49 49 7 54 50 0 59 48 33 58 -173 0 0 49 23 24 5 2 4 35 98 -2 49 32 51 49 13 58 50 6 59 48 40 3 -172 0 0 49 29 7 5 1 58 35 99 -3 49 38 33 49 19 41 50 12 38 48 45 48 -171 0 0 49 34 29 5 1 51 36 100 -4 49 43 55 49 25 4 50 17 58 48 51 14 -170 0 0 49 39 32 5 1 45 37 101 -4 49 48 57 49 30 7 50 22 58 48 56 19 -169 0 0 49 44 15 5 1 38 37 102 -5 49 53 40 49 34 50 50 27 39 49 1 4 -168 0 0 49 48 38 5 1 32 38 103 -5 49 58 3 49 39 14 50 32 0 49 5 29 -167 0 0 49 52 42 5 1 25 38 103 -6 50 2 6 49 43 18 50 36 2 49 9 35 -166 0 0 49 56 26 5 1 18 39 104 -7 50 5 50 49 47 3 50 39 44 49 13 21 -165 0 0 49 59 51 5 1 11 40 105 -7 50 9 14 49 50 28 50 43 8 49 16 47 -164 0 0 50 2 56 5 1 4 40 106 -8 50 12 19 49 53 34 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65 0 0 28 2 35 4 43 23 50 270 -74 28 13 13 27 51 57 28 51 39 27 13 50 - 64 0 0 27 33 29 4 43 10 50 271 -75 27 44 7 27 22 51 28 22 33 26 44 44 - 63 0 0 27 4 12 4 42 58 49 272 -75 27 14 50 26 53 34 27 53 17 26 15 26 - 62 0 0 26 34 45 4 42 45 48 273 -75 26 45 23 26 24 7 27 23 51 25 45 58 - 61 0 0 26 5 8 4 42 32 47 273 -75 26 15 47 25 54 30 26 54 14 25 16 22 - 60 0 0 25 35 22 4 42 20 46 274 -75 25 46 1 25 24 45 26 24 28 24 46 36 - 59 0 0 25 5 29 4 42 8 45 275 -75 25 16 7 24 54 51 25 54 34 24 16 42 - 58 0 0 24 35 27 4 41 56 44 276 -75 24 46 6 24 24 50 25 24 32 23 46 41 - 57 0 0 24 5 19 4 41 44 43 277 -75 24 15 58 23 54 42 24 54 24 23 16 34 - 56 0 0 23 35 5 4 41 32 43 278 -75 23 45 43 23 24 27 24 24 8 22 46 20 - 55 0 0 23 4 45 4 41 20 42 278 -74 23 15 23 22 54 8 23 53 48 22 16 2 - 54 0 0 22 34 21 4 41 9 41 279 -74 22 44 58 22 23 44 23 23 22 21 45 39 - 53 0 0 22 3 53 4 40 58 40 280 -74 22 14 30 21 53 16 22 52 52 21 15 12 - 52 0 0 21 33 21 4 40 46 39 280 -73 21 43 58 21 22 45 22 22 19 20 44 42 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7 35 9 7 14 50 8 11 52 6 38 24 - 22 0 0 6 59 0 4 37 12 8 290 -47 7 9 9 6 48 52 7 45 46 6 12 30 - 21 0 0 6 33 21 4 37 10 7 290 -46 6 43 29 6 23 15 7 20 1 5 46 57 - 20 0 0 6 8 3 4 37 8 6 291 -44 6 18 9 5 57 58 6 54 37 5 21 45 - 19 0 0 5 43 7 4 37 7 4 291 -43 5 53 12 5 33 3 6 29 35 4 56 55 - 18 0 0 5 18 33 4 37 5 3 291 -42 5 28 36 5 8 30 6 4 55 .. .. .. - 17 0 0 4 54 21 4 37 4 2 291 -41 5 4 23 4 44 20 5 40 37 .. .. .. - 16 0 0 4 30 33 4 37 4 1 291 -40 4 40 34 4 20 33 5 16 43 .. .. .. - 15 0 0 4 7 9 4 37 3 0 291 -39 4 17 8 3 57 10 4 53 12 .. .. .. Uncertainty in time = +/- 11 secs Prediction of 2010 Feb 4.0 Data for the target star ------------------------ * name: TYC 1358-00822-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 15 22.5337 DE: +20 57 20.460 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .017 ) * V mag [mag]: 11.2 * B mag [mag]: 11.9 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2271) Kiso approx. diameter [km]: 32 approx. diameter ["]: .021 distance from Earth [AU]: 2.09000 * orbital information: orbit source: Preston date of fit: 2010 Feb 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1037 number of rejected observations: 47 time covered by the observations: 1928 Feb 26 - 2010 Jan 18 1 sigma uncertainty ellipse (major, minor, PA): 0.044, 0.033, 95° remarks: * orbital elements for (2271) Kiso : Mean anomaly = 165.79400412 deg Arg. of pericenter = 176.14810579 deg Long. of node = 136.52250563 deg Inclination = 3.38477784 deg Eccentricity = 0.05942498 Semimajor axis = 2.75949412 AU Perihelion dist = 2.59551123 AU Mag: H = 10.94, G = 0.15 Epoch of elements : MJD 55243.20200000 TDT (2010 Feb 16.202) ------ occelmnt file for Occult BEGIN ----------------------------------- 2010 Feb 16 2271 Kiso 4h 51.0m UT 11.2 7 15 22.534 20 57 20.46TYC 1358-00822-1 11.9 15.8 32 4.6 2.090 -1.126 5.20 -109.9972 20.955 110.76 -12.37 4.8507 0.12253 0.36319 -3.75177 1.23674 0.00380 -0.00039 2000 165.1055402010 213.00000176.148106136.522506 3.3847780.05942498 2.7594941 2.595511211.1 5.00.15 RATE 2.1501060 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.049 0.037 94 2.80 0.038 0 055231.0020100216_0822-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2010 Feb 03, 18:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org