IOTA/IOTA-ES occultation update for (326) Tamara / UCAC4-231-176841 event on 2023 Apr 18, 14:38 UT Visible from New Zealand Summary ------- On 2023 Apr 18 UT, the 93.1 km diameter asteroid (326) Tamara will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.02 mag to 12.88 mag (the magnitude of the asteroid) for at most 4.480 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 Apr 18, 14:33 - 2023 Apr 18, 14:43 * geocentric midpoint of event [JD]: 2460053.11002292 * magnitude of target star: 12.40 * magnitude drop [mag]: 1.02 * estimated maximum duration [s]: 4.480 * Moon: 3 % sunlit, 78° distance * Sun: 99° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 103 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 86°) * approx speed of asteroid's shadow [km/s]: 20.7614 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-231-176841 by 326 Tamara on 2023 Apr 18 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 142 0 0 .. .. .... .. .. .. .. .. .. 2 8 55 .. .. .. 2 1 22 .. .. .. .... 143 0 0 1 49 38 14 33 48.6 1 134 -77 1 10 3 2 28 53 1 2 25 2 36 24 .... 144 0 0 0 49 44 14 33 48.8 2 134 -78 0 9 39 1 29 29 0 1 55 1 37 5 0.43 145 0 0 - 0 11 42 14 33 49.3 4 134 -79 - 0 52 18 0 28 34 - 1 0 8 0 36 16 0.45 146 0 0 - 1 14 40 14 33 50.0 5 134 -79 - 1 55 48 - 0 33 53 - 2 3 45 - 0 26 5 0.46 147 0 0 - 2 19 10 14 33 50.9 7 134 -80 - 3 0 51 - 1 37 51 - 3 8 54 - 1 29 57 0.47 148 0 0 - 3 25 12 14 33 52.1 8 134 -80 - 4 7 26 - 2 43 20 - 4 15 36 - 2 35 20 0.47 149 0 0 - 4 32 45 14 33 53.5 10 134 -80 - 5 15 33 - 3 50 20 - 5 23 50 - 3 42 14 0.48 150 0 0 - 5 41 48 14 33 55.1 11 134 -80 - 6 25 12 - 4 58 49 - 6 33 35 - 4 50 36 0.48 151 0 0 - 6 52 21 14 33 57.1 13 133 -80 - 7 36 20 - 6 8 47 - 7 44 50 - 6 0 28 0.48 152 0 0 - 8 4 21 14 33 59.2 14 133 -79 - 8 48 56 - 7 20 12 - 8 57 33 - 7 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-43 11 55 -41 0 32 0.57 - 2 0 0 -40 49 25 14 43 1.3 5 213 27 -41 44 51 -39 54 49 -41 55 36 -39 44 25 0.60 - 1 0 0 -39 31 58 14 43 2.1 4 213 28 -40 27 16 -38 37 30 -40 37 59 -38 27 7 0.64 0 0 0 -38 13 22 14 43 2.6 2 212 28 -39 8 29 -37 19 5 -39 19 10 -37 8 45 0.74 1 0 0 -36 53 47 14 43 2.9 1 212 28 -37 48 39 -35 59 43 -37 59 18 .. .. .. 1.18 2 0 0 .. .. .... .. .. .. .. .. .. -36 27 54 .. .. .. -36 38 29 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: UCAC4-231-176841 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 37 04.5022 DE: -43 51 04.515 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 37 04.5022 DE: -43 51 04.515 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (326) Tamara asteroid class: approx. diameter [km]: 93 approx. diameter ["]: 0.088 distance from Earth [AU]: 1.45200 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): 0.015", 0.002", 85.606° remarks: * orbital elements for (326)Tamara : Mean anomaly = 351.4204260298 deg Arg. of pericenter = 238.5210787770 deg Long. of node = 32.1685690124 deg Inclination = 23.7244484126 deg Eccentricity = 0.1896077299 Semimajor axis = 2.3176501630 AU Perihelion dist = 1.8782057769 AU Mag: H = 9.34, G = 0.15 Epoch of elements : MJD 60052.60993055 TDT (2023 Apr 18.6099) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Feb07,4.48,2023,4,18,14.640550,-0.208047,-0.375842,10.250140,-5.679219,-0.005015,-0.000600,0.000000,0.000001 -131.3842,-43.7978,-39.76,10.87,False UCAC4-231-176841,19.61791724,-43.8512543,0.00,12.40,0.00,0.0,0,,19.64521983,-43.7978151,1.02,0.00,0,0,0 326,Tamara,12.88,93.1,1.4520,0,0,5.734,-34.39,,5.8,0 0,351.2500,2023,4,18,238.5211,32.1686,23.7244,0.18961,2.31765,1.87821,9.34,5.0,0.15 1.096,0.0150,0.0024,86,0.0085,Known errors,-1.00,-1,-1,-1 20230418_176841,60004.05 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org