IOTA/IOTA-ES occultation update for (780) Armenia / TYC 0224-00486-1 event on 2012 Dec 09, 01:23 UT Visible from Africa Summary ------- On 2012 Dec 09 UT, the 98 km diameter asteroid (780) Armenia will occult a 12.0 mag star in the constellation Hydra for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 14.4 mag (the magnitude of the asteroid) for at most 36.6 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: 76 * date and approx. time of event: 2012 Dec 09, 01:03 - 2012 Dec 09, 02:04 UT * geocentric midpoint of event [JD]: 2456270.5590625 * magnitude of target star: 12.0 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 36.6 * Moon: 25 % sunlit, 64° distance * Sun: 123° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 98 * 1 sigma uncertainty interval [path widths]: +/- 0.74 * 1 sigma uncertainty interval [seconds]: +/- 27.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .038) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .038", 89° ) * approx speed of asteroid's shadow [km/s]: 2.6907 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0224-00486-1 by 780 Armenia on 2012 Dec 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 - 71 0 0 38 42 47 2 4 13 0 82 -54 39 9 37 38 15 58 39 49 21 37 36 19 - 70 0 0 38 49 0 2 4 12 1 83 -55 39 15 47 38 22 13 39 55 29 37 42 36 - 69 0 0 38 54 44 2 4 11 2 83 -55 39 21 30 38 27 59 40 1 9 37 48 25 - 68 0 0 39 0 0 2 4 10 3 84 -56 39 26 44 38 33 16 40 6 21 37 53 45 - 67 0 0 39 4 48 2 4 8 3 85 -57 39 31 31 38 38 6 40 11 6 37 58 37 - 66 0 0 39 9 9 2 4 6 4 85 -58 39 35 50 38 42 28 40 15 23 38 3 0 - 65 0 0 39 13 2 2 4 4 5 86 -58 39 39 42 38 46 22 40 19 13 38 6 56 - 64 0 0 39 16 27 2 4 1 6 87 -59 39 43 7 38 49 49 40 22 37 38 10 24 - 63 0 0 39 19 26 2 3 57 6 87 -60 39 46 5 38 52 48 40 25 33 38 13 25 - 62 0 0 39 21 58 2 3 54 7 88 -60 39 48 36 38 55 21 40 28 4 38 15 59 - 61 0 0 39 24 3 2 3 49 8 88 -61 39 50 41 38 57 27 40 30 8 38 18 5 - 60 0 0 39 25 42 2 3 45 9 89 -62 39 52 19 38 59 6 40 31 46 38 19 45 - 59 0 0 39 26 55 2 3 40 10 90 -62 39 53 32 39 0 18 40 32 58 38 20 58 - 58 0 0 39 27 41 2 3 34 10 90 -63 39 54 18 39 1 5 40 33 44 38 21 44 - 57 0 0 39 28 1 2 3 29 11 91 -64 39 54 38 39 1 25 40 34 5 38 22 5 - 56 0 0 39 27 56 2 3 22 12 92 -64 39 54 33 39 1 19 40 34 0 38 21 58 - 55 0 0 39 27 24 2 3 16 13 92 -65 39 54 2 39 0 48 40 33 29 38 21 26 - 54 0 0 39 26 27 2 3 9 13 93 -65 39 53 6 38 59 50 40 32 34 38 20 28 - 53 0 0 39 25 5 2 3 2 14 93 -66 39 51 44 38 58 27 40 31 13 38 19 4 - 52 0 0 39 23 17 2 2 54 15 94 -67 39 49 57 38 56 39 40 29 27 38 17 15 - 51 0 0 39 21 4 2 2 46 16 95 -67 39 47 45 38 54 25 40 27 16 38 14 59 - 50 0 0 39 18 26 2 2 37 16 95 -68 39 45 7 38 51 45 40 24 40 38 12 18 - 49 0 0 39 15 22 2 2 28 17 96 -68 39 42 5 38 48 41 40 21 40 38 9 12 - 48 0 0 39 11 54 2 2 19 18 96 -69 39 38 38 38 45 11 40 18 14 38 5 41 - 47 0 0 39 8 0 2 2 9 19 97 -69 39 34 45 38 41 16 40 14 24 38 1 44 - 46 0 0 39 3 41 2 1 59 19 98 -70 39 30 28 38 36 56 40 10 9 37 57 21 - 45 0 0 38 58 58 2 1 49 20 98 -71 39 25 47 38 32 11 40 5 30 37 52 34 - 44 0 0 38 53 50 2 1 38 21 99 -71 39 20 40 38 27 1 40 0 26 37 47 22 - 43 0 0 38 48 17 2 1 27 22 100 -72 39 15 9 38 21 26 39 54 58 37 41 44 - 42 0 0 38 42 19 2 1 15 22 100 -72 39 9 13 38 15 26 39 49 5 37 35 42 - 41 0 0 38 35 57 2 1 4 23 101 -72 39 2 53 38 9 2 39 42 47 37 29 14 - 40 0 0 38 29 9 2 0 51 24 101 -73 38 56 8 38 2 12 39 36 6 37 22 22 - 39 0 0 38 21 58 2 0 38 25 102 -73 38 48 58 37 54 58 39 28 59 37 15 4 - 38 0 0 38 14 21 2 0 25 25 103 -74 38 41 24 37 47 20 39 21 29 37 7 22 - 37 0 0 38 6 20 2 0 12 26 103 -74 38 33 26 37 39 16 39 13 34 36 59 15 - 36 0 0 37 57 55 1 59 58 27 104 -74 38 25 2 37 30 48 39 5 15 36 50 43 - 35 0 0 37 49 4 1 59 44 28 104 -75 38 16 15 37 21 55 38 56 31 36 41 47 - 34 0 0 37 39 50 1 59 29 28 105 -75 38 7 3 37 12 38 38 47 23 36 32 25 - 33 0 0 37 30 10 1 59 14 29 105 -75 37 57 26 37 2 56 38 37 51 36 22 39 - 32 0 0 37 20 7 1 58 58 30 106 -75 37 47 25 36 52 49 38 27 54 36 12 29 - 31 0 0 37 9 38 1 58 42 31 107 -76 37 37 0 36 42 18 38 17 33 36 1 53 - 30 0 0 36 58 45 1 58 26 31 107 -76 37 26 10 36 31 22 38 6 48 35 50 53 - 29 0 0 36 47 28 1 58 9 32 108 -76 37 14 56 36 20 2 37 55 38 35 39 28 - 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7 42 38 69 0 0 - 6 59 34 1 3 52 57 293 0 - 6 29 30 - 7 29 37 - 5 44 59 - 8 14 4 Uncertainty in time = +/- 28 secs Prediction of 2012 Dec 3.0 Data for the target star ------------------------ * name: TYC 0224-00486-1 * constellation : Hydra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 51 01.2626 DE: +06 18 25.941 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .034, .037 ) * V mag [mag]: 12.0 * B mag [mag]: 12.7 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (780) Armenia approx. diameter [km]: 98 approx. diameter ["]: .052 distance from Earth [AU]: 2.58300 * orbital information: orbit source: Preston date of fit: 2012 Nov 29 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 937 number of rejected observations: 76 time covered by the observations: 1909 Feb 20 - 2012 Nov 17 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.010, 85° remarks: * orbital elements for (780) Armenia : Mean anomaly = 106.97605979 deg Arg. of pericenter = 215.16185565 deg Long. of node = 144.86619937 deg Inclination = 19.08280969 deg Eccentricity = 0.09716927 Semimajor axis = 3.11338895 AU Perihelion dist = 2.81086321 AU Mag: H = 8.94, G = 0.15 Epoch of elements : MJD 56270.05800000 TDT (2012 Dec 09.058) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Dec 9 780 Armenia 1h 25.1m UT 12.0 8 51 1.263 6 18 25.94TYC 0224-00486-1 12.7 14.4 98 36.6 2.583 -0.291 2.85 33.2935 6.306 156.82 -22.84 1.4175 0.05180 0.08042 -1.26952 0.83351 -0.00468 0.00200 2000 105.17152420121129.00000215.161856144.866199 19.0828100.09716927 3.1133890 2.8108632 9.0 5.00.15 RATE 1.7941300 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.038 89 1.74 0.039 0 0-4 1 056264.0020121209_0486-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 29, 22:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org