IOTA/IOTA-ES occultation update for (406) Erna / UCAC2 20226218 event on 2009 Jun 10, 12:53 UT Visible from Summary ------- On 2009 Jun 10 UT, the 49 km diameter asteroid (406) Erna will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 14.2 mag (the magnitude of the asteroid) for at most 4.5 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: 45 * date and approx. time of event: 2009 Jun 10, 12:44 - 2009 Jun 10, 13:03 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 4.5 * Moon: 93 % sunlit, 21° distance * Sun: 170° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 51 * 1 sigma uncertainty interval [path widths]: +/- 1.44 * 1 sigma uncertainty interval [seconds]: +/- 6.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .065 +/- .055) * 1 sigma uncertainty ellipse (major, minor, PA): ( .065", .055", 89° ) * approx speed of asteroid's shadow [km/s]: 10.9638 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 20226218 by 406 Erna on 2009 Jun 10 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 78 0 0 -11 2 25 13 3 0 0 119 -8 -10 46 45 -11 18 6 .. .. .. -12 3 23 79 0 0 -11 35 25 13 3 0 1 119 -9 -11 19 44 -11 51 7 -10 34 41 -12 36 26 80 0 0 -12 8 27 13 3 0 2 119 -10 -11 52 46 -12 24 10 -11 7 41 -13 9 32 81 0 0 -12 41 31 13 2 59 4 118 -11 -12 25 49 -12 57 15 -11 40 43 -13 42 38 82 0 0 -13 14 36 13 2 58 5 118 -12 -12 58 54 -13 30 20 -12 13 46 -14 15 45 83 0 0 -13 47 41 13 2 57 6 118 -13 -13 31 58 -14 3 25 -12 46 49 -14 48 51 84 0 0 -14 20 44 13 2 56 7 118 -14 -14 5 0 -14 36 28 -13 19 51 -15 21 55 85 0 0 -14 53 44 13 2 54 8 117 -16 -14 38 1 -15 9 29 -13 52 50 -15 54 57 86 0 0 -15 26 41 13 2 53 9 117 -17 -15 10 58 -15 42 26 -14 25 47 -16 27 55 87 0 0 -15 59 35 13 2 51 10 117 -18 -15 43 51 -16 15 19 -14 58 40 -17 0 48 88 0 0 -16 32 22 13 2 49 11 117 -19 -16 16 39 -16 48 7 -15 31 28 -17 33 36 89 0 0 -17 5 4 13 2 46 12 116 -20 -16 49 21 -17 20 49 -16 4 10 -18 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-23 47 52 -25 48 43 - 99 0 0 -24 18 19 12 44 45 17 246 -7 -24 2 44 -24 33 56 -23 17 58 -25 18 59 - 98 0 0 -23 48 13 12 44 42 16 246 -6 -23 32 37 -24 3 51 -22 47 47 -24 48 58 - 97 0 0 -23 17 49 12 44 39 15 245 -5 -23 2 12 -23 33 28 -22 17 19 -24 18 39 - 96 0 0 -22 47 9 12 44 36 14 245 -4 -22 31 31 -23 2 49 -21 46 34 -23 48 3 - 95 0 0 -22 16 13 12 44 33 13 244 -3 -22 0 34 -22 31 54 -21 15 35 -23 17 11 - 94 0 0 -21 45 2 12 44 31 12 244 -2 -21 29 22 -22 0 44 -20 44 20 -22 46 3 - 93 0 0 -21 13 37 12 44 29 11 244 -1 -20 57 55 -21 29 19 -20 12 51 -22 14 41 Uncertainty in time = +/- 8 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 20226218 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 53 41.8530 DE: -28 29 27.910 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .050, .050 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (406) Erna approx. diameter [km]: 49 approx. diameter ["]: .038 distance from Earth [AU]: 1.79600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 952 number of rejected observations: 87 time covered by the observations: 1903 Feb 20 - 2008 Jan 16 1 sigma uncertainty ellipse (major, minor, PA): 0.042, 0.022, 88° remarks: * orbital elements for (406) Erna : Mean anomaly = 292.41824170 deg Arg. of pericenter = 37.86699430 deg Long. of node = 315.84730153 deg Inclination = 4.19908960 deg Eccentricity = 0.18364692 Semimajor axis = 2.91321140 AU Perihelion dist = 2.37820911 AU Mag: H = 10.25, G = 0.15 Epoch of elements : MJD 54992.53700000 TDT (2009 Jun 10.537) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 10 406 Erna 12h 53.6m UT 11.3 17 53 41.853-28 29 27.91UCAC2 20226218 0.0 14.2 49 4.5 1.796 -2.296 1.43 176.0004 -28.492 -13.54 23.05 12.8941 -0.01222 -0.26024 -6.18136 0.29227 -0.00087 0.00049 2000 291.9153592009 6 8.00000 37.866994315.847302 4.1990900.18364692 2.9132114 2.378209110.4 5.00.15 RATE 1.9821940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.065 0.055 89 2.44 0.054 0 54545.5020090610_226218 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org