IOTA/IOTA-ES occultation update for (326) Tamara / UCAC4 278-146299 event on 2023 Mar 06, 07:44 UT Visible from South America Summary ------- On 2023 Mar 06 UT, the 93.1 km diameter asteroid (326) Tamara will occult a 10.4 mag star in the constellation Scorpius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.14 mag to 13.45 mag (the magnitude of the asteroid) for at most 3.070 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2023 Mar 06, 07:40 - 2023 Mar 06, 07:47 * geocentric midpoint of event [JD]: 2460009.82238679 * magnitude of target star: 10.37 * magnitude drop [mag]: 3.14 * estimated maximum duration [s]: 3.070 * Moon: 98 % sunlit, 118° distance * Sun: 76° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.04 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 106°) * approx speed of asteroid's shadow [km/s]: 30.2930 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 278-146299 by 326 Tamara on 2023 Mar 6 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 89 0 0 .. .. .... .. .. .. .. .. .. 15 4 28 .. .. .. 15 2 9 .. .. .. .... - 88 0 0 14 53 12 7 40 44.3 1 126 -64 14 21 45 15 24 38 14 19 26 15 26 57 .... - 87 0 0 14 9 56 7 40 44.4 2 126 -64 13 38 20 14 41 31 13 36 0 14 43 50 0.14 - 86 0 0 13 25 59 7 40 44.6 4 127 -63 12 54 14 13 57 42 12 51 53 14 0 2 0.12 - 85 0 0 12 41 20 7 40 45.0 5 127 -62 12 9 27 13 13 12 12 7 6 13 15 32 0.11 - 84 0 0 11 56 2 7 40 45.4 6 127 -61 11 24 0 12 28 2 11 21 39 12 30 23 0.11 - 83 0 0 11 10 6 7 40 45.9 7 127 -60 10 37 56 11 42 13 10 35 34 11 44 35 0.10 - 82 0 0 10 23 32 7 40 46.5 8 128 -60 9 51 14 10 55 47 9 48 51 10 58 10 0.10 - 81 0 0 9 36 21 7 40 47.3 10 128 -59 9 3 56 10 8 45 9 1 33 10 11 8 0.10 - 80 0 0 8 48 37 7 40 48.1 11 128 -58 8 16 4 9 21 7 8 13 40 9 23 31 0.10 - 79 0 0 8 0 18 7 40 49.0 12 128 -57 7 27 38 8 32 56 7 25 14 8 35 20 0.10 - 78 0 0 7 11 28 7 40 50.1 14 128 -56 6 38 41 7 44 13 6 36 17 7 46 38 0.09 - 77 0 0 6 22 8 7 40 51.3 15 128 -55 5 49 15 6 55 0 5 46 50 6 57 25 0.09 - 76 0 0 5 32 20 7 40 52.5 16 128 -54 4 59 20 6 5 17 4 56 54 6 7 43 0.09 - 75 0 0 4 42 5 7 40 53.9 17 128 -53 4 8 59 5 15 8 4 6 33 5 17 34 0.09 - 74 0 0 3 51 25 7 40 55.4 19 128 -52 3 18 14 4 24 34 3 15 48 4 27 1 0.09 - 73 0 0 3 0 23 7 40 57.0 20 129 -51 2 27 7 3 33 37 2 24 40 3 36 4 0.09 - 72 0 0 2 9 1 7 40 58.7 21 129 -50 1 35 40 2 42 20 1 33 12 2 44 46 0.09 - 71 0 0 1 17 20 7 41 0.6 23 129 -48 0 43 55 1 50 43 0 41 27 1 53 10 0.09 - 70 0 0 0 25 23 7 41 2.5 24 129 -47 - 0 8 6 0 58 50 - 0 10 34 1 1 18 0.09 - 69 0 0 - 0 26 47 7 41 4.6 25 129 -46 - 1 0 20 0 6 43 - 1 2 48 0 9 11 0.09 - 68 0 0 - 1 19 9 7 41 6.7 27 129 -45 - 1 52 45 - 0 45 36 - 1 55 13 - 0 43 8 0.09 - 67 0 0 - 2 11 40 7 41 9.0 28 128 -44 - 2 45 18 - 1 38 4 - 2 47 47 - 1 35 36 0.09 - 66 0 0 - 3 4 17 7 41 11.3 29 128 -43 - 3 37 58 - 2 30 39 - 3 40 26 - 2 28 11 0.09 - 65 0 0 - 3 56 59 7 41 13.8 31 128 -42 - 4 30 40 - 3 23 19 - 4 33 9 - 3 20 51 0.09 - 64 0 0 - 4 49 42 7 41 16.3 32 128 -40 - 5 23 24 - 4 16 1 - 5 25 53 - 4 13 32 0.09 - 63 0 0 - 5 42 23 7 41 19.0 33 128 -39 - 6 16 7 - 5 8 42 - 6 18 36 - 5 6 14 0.09 - 62 0 0 - 6 35 2 7 41 21.7 35 128 -38 - 7 8 45 - 6 1 20 - 7 11 14 - 5 58 52 0.09 - 61 0 0 - 7 27 34 7 41 24.6 36 128 -37 - 8 1 17 - 6 53 53 - 8 3 46 - 6 51 24 0.09 - 60 0 0 - 8 19 57 7 41 27.5 37 128 -36 - 8 53 40 - 7 46 18 - 8 56 8 - 7 43 49 0.09 - 59 0 0 - 9 12 10 7 41 30.5 39 127 -35 - 9 45 51 - 8 38 32 - 9 48 19 - 8 36 3 0.09 - 58 0 0 -10 4 9 7 41 33.6 40 127 -33 -10 37 48 - 9 30 33 -10 40 17 - 9 28 5 0.09 - 57 0 0 -10 55 53 7 41 36.7 41 127 -32 -11 29 29 -10 22 19 -11 31 58 -10 19 51 0.09 - 56 0 0 -11 47 18 7 41 40.0 43 127 -31 -12 20 52 -11 13 47 -12 23 20 -11 11 19 0.09 - 55 0 0 -12 38 23 7 41 43.2 44 126 -30 -13 11 53 -12 4 55 -13 14 21 -12 2 28 0.09 - 54 0 0 -13 29 6 7 41 46.6 45 126 -29 -14 2 32 -12 55 42 -14 4 59 -12 53 14 0.09 - 53 0 0 -14 19 23 7 41 50.0 46 126 -28 -14 52 45 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.... Uncertainty in time = +/- 1 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 278-146299 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 54 50.2602 DE: -34 30 42.237 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 54 50.2602 DE: -34 30 42.237 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (326) Tamara asteroid class: approx. diameter [km]: 93 approx. diameter ["]: 0.068 distance from Earth [AU]: 1.89230 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#118 date of fit: 2023 Feb 07 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.012", 0.002", 105.79° remarks: * orbital elements for (326)Tamara : Mean anomaly = 339.3298475326 deg Arg. of pericenter = 238.5207474540 deg Long. of node = 32.1686367089 deg Inclination = 23.7244810847 deg Eccentricity = 0.1896347430 Semimajor axis = 2.3177245844 AU Perihelion dist = 1.8782034784 AU Mag: H = 9.34, G = 0.15 Epoch of elements : MJD 60009.32229167 TDT (2023 Mar 06.3223) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Feb07,3.07,2023,3,6,7.737283,-0.029506,-0.069729,15.715406,-6.736070,-0.005102,-0.000207,0.000000,0.000000 -10.7572,-34.5153,66.78,-5.73,False UCAC4 278-146299,17.91396112,-34.5117324,0.00,10.37,0.00,0.0,0,,17.93935022,-34.5153047,3.14,0.00,0,0,0 326,Tamara,13.45,93.1,1.8923,0,0,5.910,-31.30,,5.8,0 0,339.2398,2023,3,6,238.5207,32.1686,23.7245,0.18963,2.31772,1.87820,9.34,5.0,0.15 1.037,0.0120,0.0020,106,0.0025,Known errors,-1.00,-1,-1,-1 20230306_146299,59990.86 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org