IOTA/IOTA-ES occultation update for (2394) Nadeev / UCAC2 39653549 event on 2009 Feb 09, 20:43 UT Visible from Summary ------- On 2009 Feb 09 UT, the 44 km diameter asteroid (2394) Nadeev will occult a 11.5 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 15.8 mag (the magnitude of the asteroid) for at most 9.2 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: 34 * date and approx. time of event: 2009 Feb 09, 20:27 - 2009 Feb 09, 20:55 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 9.2 * Moon: 100 % sunlit, 41° distance * Sun: 143° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 64 * 1 sigma uncertainty interval [path widths]: +/- 1.99 * 1 sigma uncertainty interval [seconds]: +/- 27.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .107 +/- .064) * 1 sigma uncertainty ellipse (major, minor, PA): ( .107", .064", 94° ) * approx speed of asteroid's shadow [km/s]: 4.7766 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 39653549 by 2394 Nadeev on 2009 Feb 9 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 - 77 0 0 67 4 34 20 55 51 21 82 0 67 24 40 66 44 36 68 46 17 65 26 37 - 76 0 0 67 18 35 20 55 46 21 83 -1 67 38 37 66 58 43 68 59 52 65 41 2 - 75 0 0 67 32 15 20 55 40 22 84 -1 67 52 11 67 12 28 69 13 6 65 55 5 - 74 0 0 67 45 33 20 55 35 22 85 -1 68 5 25 67 25 51 69 25 58 66 8 46 - 73 0 0 67 58 30 20 55 29 23 86 -2 68 18 16 67 38 52 69 38 29 66 22 6 - 72 0 0 68 11 5 20 55 24 23 87 -2 68 30 47 67 51 33 69 50 39 66 35 4 - 71 0 0 68 23 20 20 55 18 23 88 -3 68 42 57 68 3 52 70 2 28 66 47 42 - 70 0 0 68 35 15 20 55 12 24 89 -3 68 54 47 68 15 52 70 13 58 66 59 59 - 69 0 0 68 46 50 20 55 7 24 90 -4 69 6 17 68 27 31 70 25 7 67 11 56 - 68 0 0 68 58 5 20 55 1 24 91 -4 69 17 27 68 38 51 70 35 57 67 23 34 - 67 0 0 69 9 0 20 54 56 25 92 -4 69 28 18 68 49 51 70 46 28 67 34 51 - 66 0 0 69 19 37 20 54 50 25 93 -5 69 38 50 69 0 32 70 56 41 67 45 50 - 65 0 0 69 29 55 20 54 44 25 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.. 119 0 0 31 40 29 20 27 42 3 294 -31 31 59 37 31 21 28 33 17 5 .. .. .. 120 0 0 31 13 59 20 27 41 2 295 -30 31 33 3 30 55 2 32 50 12 .. .. .. 121 0 0 30 47 52 20 27 40 1 295 -29 31 6 51 30 28 59 32 23 43 .. .. .. 122 0 0 30 22 9 20 27 40 0 296 -28 30 41 4 30 3 20 31 57 39 .. .. .. Uncertainty in time = +/- 29 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: UCAC2 39653549 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 01 19.4542 DE: +22 15 04.764 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .017 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2394) Nadeev approx. diameter [km]: 44 approx. diameter ["]: .033 distance from Earth [AU]: 1.81300 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 755 number of rejected observations: 31 time covered by the observations: 1950 Oct 09 - 2008 Jan 12 1 sigma uncertainty ellipse (major, minor, PA): 0.105, 0.062, 94° remarks: * orbital elements for (2394) Nadeev : Mean anomaly = 32.01555247 deg Arg. of pericenter = 301.41434759 deg Long. of node = 127.52151894 deg Inclination = 1.62534742 deg Eccentricity = 0.20916876 Semimajor axis = 3.18050594 AU Perihelion dist = 2.51524346 AU Mag: H = 11.80, G = 0.15 Epoch of elements : MJD 54871.86300000 TDT (2009 Feb 09.863) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 9 2394 Nadeev 20h 42.9m UT 11.5 7 1 19.454 22 15 4.76UCAC2 39653549 0.0 15.8 44 9.2 1.813 -0.913 3.13 14.5282 22.251 -127.17 -14.42 20.7154 0.17350 0.70593 -2.61747 0.64615 0.00349 -0.00033 2000 31.6918302009 2 8.00000301.414348127.521519 1.6253470.20916876 3.1805059 2.515243511.6 5.00.15 RATE 1.7376400 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.107 0.064 94 2.99 0.066 0 54776.5020090209_653549 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org