IOTA/IOTA-ES occultation update for (869) Mellena / TYC 0759-02314-1 event on 2012 Dec 18, 13:37 UT Visible from Australia Summary ------- On 2012 Dec 18 UT, the 19 km diameter asteroid (869) Mellena will occult a 10.4 mag star in the constellation Gemini for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.8 mag to 17.2 mag (the magnitude of the asteroid) for at most 1.3 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: 20 * date and approx. time of event: 2012 Dec 18, 13:31 - 2012 Dec 18, 13:43 UT * geocentric midpoint of event [JD]: 2456280.06754583 * magnitude of target star: 10.4 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 1.3 * Moon: 33 % sunlit, 125° distance * Sun: 163° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 3.29 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .036", 92° ) * approx speed of asteroid's shadow [km/s]: 14.6621 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0759-02314-1 by 869 Mellena on 2012 Dec 18 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 -28 8 3 13 43 18 0 75 -7 -28 1 38 -28 14 29 .. .. .. .. .. .. 87 0 0 -27 53 29 13 43 18 1 74 -8 -27 47 3 -27 59 54 .. .. .. -28 42 26 88 0 0 -27 39 1 13 43 18 2 74 -9 -27 32 36 -27 45 26 .. .. .. -28 27 56 89 0 0 -27 24 40 13 43 18 3 73 -10 -27 18 16 -27 31 6 .. .. .. -28 13 33 90 0 0 -27 10 28 13 43 17 4 73 -11 -27 4 3 -27 16 53 .. .. .. -27 59 18 91 0 0 -26 56 23 13 43 17 5 72 -12 -26 49 58 -27 2 47 .. .. .. -27 45 11 92 0 0 -26 42 26 13 43 16 6 72 -12 -26 36 2 -26 48 50 -25 54 8 -27 31 12 93 0 0 -26 28 38 13 43 15 7 71 -13 -26 22 14 -26 35 2 -25 40 22 -27 17 22 94 0 0 -26 14 59 13 43 14 7 71 -14 -26 8 35 -26 21 22 -25 26 45 -27 3 40 95 0 0 -26 1 29 13 43 13 8 70 -15 -25 55 6 -26 7 52 -25 13 18 -26 50 7 96 0 0 -25 48 8 13 43 12 9 70 -16 -25 41 45 -25 54 31 -24 59 59 -26 36 44 97 0 0 -25 34 57 13 43 10 10 70 -17 -25 28 34 -25 41 20 -24 46 51 -26 23 31 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3 -130 0 0 -31 36 7 13 31 39 18 299 -1 -31 29 39 -31 42 35 -30 47 20 -32 25 24 Uncertainty in time = +/- 6 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0759-02314-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 46 45.4382 DE: +13 33 24.715 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .023 ) * V mag [mag]: 10.4 * B mag [mag]: 10.6 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (869) Mellena approx. diameter [km]: 19 approx. diameter ["]: .011 distance from Earth [AU]: 2.29800 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1051 number of rejected observations: 45 time covered by the observations: 1930 Feb 28 - 2012 Feb 23 1 sigma uncertainty ellipse (major, minor, PA): 0.046, 0.028, 92° remarks: * orbital elements for (869) Mellena : Mean anomaly = 202.47936843 deg Arg. of pericenter = 107.01535717 deg Long. of node = 154.97090598 deg Inclination = 7.82976811 deg Eccentricity = 0.21836543 Semimajor axis = 2.69231149 AU Perihelion dist = 2.10440375 AU Mag: H = 11.75, G = 0.15 Epoch of elements : MJD 56279.56800000 TDT (2012 Dec 18.568) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 18 869 Mellena 13h 37.3m UT 10.4 6 46 45.438 13 33 24.71TYC 0759-02314-1 10.6 17.2 19 1.3 2.298 -2.166 2.52 169.8022 13.556 -25.10 -23.40 13.6211 -0.04430 -0.54897 -8.24951 0.65767 -0.00142 0.00108 2000 200.344666201212 9.00000107.015357154.970906 7.8297680.21836543 2.6923115 2.104403712.4 5.00.15 RATE 2.2310850 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.036 92 4.29 0.037 0 0 2 5 056264.0020121218_2314-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 05:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org