IOTA/IOTA-ES occultation update for (595) Polyxena / UCAC4 327-198348 event on 2022 Dec 04, 09:16 UT Visible from E Australia Summary ------- On 2022 Dec 04 UT, the 104.3 km diameter asteroid (595) Polyxena will occult a 12.2 mag star in the constellation Capricornus for observers along a path across E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.83 mag to 13.83 mag (the magnitude of the asteroid) for at most 3.720 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: 99 * date and approx. time of event: 2022 Dec 04, 09:12 - 2022 Dec 04, 09:19 * geocentric midpoint of event [JD]: 2459917.88619250 * magnitude of target star: 12.22 * magnitude drop [mag]: 1.83 * estimated maximum duration [s]: 3.720 * Moon: 86 % sunlit, 66° distance * Sun: 72° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 112 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.004", 60°) * approx speed of asteroid's shadow [km/s]: 28.0251 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 327-198348 by 595 Polyxena on 2022 Dec 4 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 ' " Longitude Longitude Longitude Longitude .. .. .. 16 0 0 .. .. .... .. .. .. ... .. .. -160 45 29 ... .. .. -161 0 37 .... -161 40 38 15 0 0 9 19 38.8 1 244 -70 -160 29 19 -162 49 57 -160 14 4 -163 4 18 .... -163 40 47 14 0 0 9 19 38.4 3 244 -68 -162 33 8 -164 46 46 -162 18 41 -165 0 26 0.31 Latitude Latitude Latitude Latitude -164 0 0 13 50 3 9 19 38.3 4 243 -68 13 15 29 14 24 27 13 8 12 14 31 40 0.42 -165 0 0 13 18 20 9 19 38.0 5 243 -67 12 43 33 13 52 58 12 36 13 14 0 14 0.38 -166 0 0 12 45 40 9 19 37.5 6 243 -66 12 10 38 13 20 31 12 3 15 13 27 50 0.39 -167 0 0 12 12 0 9 19 37.0 7 243 -64 11 36 44 12 47 6 11 29 18 12 54 27 0.39 -168 0 0 11 37 21 9 19 36.3 8 243 -63 11 1 50 12 12 41 10 54 21 12 20 6 0.39 -169 0 0 11 1 42 9 19 35.6 9 242 -62 10 25 57 11 37 18 10 18 24 11 44 45 0.39 -170 0 0 10 25 3 9 19 34.7 11 242 -61 9 49 2 11 0 54 9 41 27 11 8 25 0.39 -171 0 0 9 47 24 9 19 33.8 12 242 -60 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18 16 0.45 0 0 0 -55 37 52 9 12 36.8 6 127 46 -56 16 55 -54 59 1 -56 25 9 -54 50 53 0.46 - 1 0 0 -55 9 59 9 12 36.5 5 127 45 -55 49 21 -54 30 51 -55 57 39 -54 22 39 0.46 - 2 0 0 -54 41 15 9 12 36.2 4 128 45 -55 20 55 -54 1 49 -55 29 17 -53 53 34 0.48 - 3 0 0 -54 11 38 9 12 36.0 3 129 45 -54 51 36 -53 31 54 -55 0 2 -53 23 35 0.50 - 4 0 0 -53 41 7 9 12 35.8 3 130 45 -54 21 24 -53 1 5 -54 29 53 -52 52 42 0.53 - 5 0 0 -53 9 41 9 12 35.7 2 131 44 -53 50 16 -52 29 21 -53 58 50 -52 20 54 0.59 - 6 0 0 -52 37 19 9 12 35.6 1 131 44 -53 18 12 -51 56 40 -53 26 50 -51 48 10 0.76 - 7 0 0 -52 4 0 9 12 35.5 0 132 44 -52 45 12 .. .. .. -52 53 53 .. .. .. 3.19 Uncertainty in time = +/- 1 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4 327-198348 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 58 12.4256 DE: -24 46 34.276 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 58 12.4255 DE: -24 46 34.276 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (595) Polyxena asteroid class: approx. diameter [km]: 104 approx. diameter ["]: 0.045 distance from Earth [AU]: 3.20080 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#97 date of fit: 2022 Nov 22 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): 0.013", 0.004", 60.326° remarks: * orbital elements for (595)Polyxena : Mean anomaly = 31.6279643069 deg Arg. of pericenter = 280.2994411999 deg Long. of node = 23.8686598749 deg Inclination = 17.8328992661 deg Eccentricity = 0.0646680009 Semimajor axis = 3.2094817661 AU Perihelion dist = 3.0019309964 AU Mag: H = 7.95, G = 0.15 Epoch of elements : MJD 59917.38625000 TDT (2022 Dec 04.3862) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#972022Nov22,3.72,2022,12,4,9.268620,0.226733,-0.285337,12.391126,9.832277,0.005418,0.001613,0.000000,0.000000 117.6708,-24.6698,38.51,-22.25,False UCAC4 327-198348,21.97011826,-24.7761876,0.00,12.22,0.00,0.0,0,,21.99139054,-24.6697584,1.83,0.00,0,0,0 595,Polyxena,13.83,104.3,3.2008,0,0,2.498,27.02,,5.2,0 0,31.5618,2022,12,4,280.2994,23.8687,17.8329,0.06467,3.20948,3.00193,7.96,5.0,0.15 1.105,0.0130,0.0043,60,0.0047,Known errors,-1.00,-1,-1,-1 20221204_198348,59914.08 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 01:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org