IOTA/IOTA-ES occultation update for (2) Pallas / UCAC4 423-024904 event on 2023 Mar 27, 15:16 UT Visible from Asia Summary ------- On 2023 Mar 27 UT, the 532 km diameter asteroid (2) Pallas will occult a 12.3 mag star in the constellation Monoceros for observers along a path across Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.02 mag to 8.19 mag (the magnitude of the asteroid) for at most 22.500 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 27, 15:12 - 2023 Mar 27, 15:21 * geocentric midpoint of event [JD]: 2460031.13676196 * magnitude of target star: 12.29 * magnitude drop [mag]: 0.02 * estimated maximum duration [s]: 22.500 * Moon: 36 % sunlit, 41° distance * Sun: 99° distance * rough path description: Asia Additional comments ------------------- low mag drop, RUWE high The occultation path -------------------- * approximate projected width [km]: 541 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.039, +/- 0.015) * 1 sigma uncertainty ellipse (major, minor, PA): (0.039", 0.015", 82°) * approx speed of asteroid's shadow [km/s]: 23.6461 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 423-024904 by 2 Pallas on 2023 Mar 27 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 - 42 0 0 -37 22 59 15 12 31.1 0 97 50 -39 49 31 .. .. .. -40 8 39 .. .. .. .... - 41 0 0 -37 28 26 15 12 31.2 1 96 50 -39 54 45 -35 0 57 -40 13 52 -34 41 31 -0.06 - 40 0 0 -37 33 15 15 12 31.3 2 96 49 -39 59 23 -35 5 58 -40 18 28 -34 46 33 -0.12 - 39 0 0 -37 37 26 15 12 31.4 2 95 49 -40 3 24 -35 10 19 -40 22 28 -34 50 55 -0.14 - 38 0 0 -37 40 59 15 12 31.6 3 94 49 -40 6 48 -35 14 0 -40 25 51 -34 54 37 -0.15 - 37 0 0 -37 43 54 15 12 31.8 4 94 49 -40 9 36 -35 17 2 -40 28 39 -34 57 40 -0.16 - 36 0 0 -37 46 11 15 12 32.1 5 93 48 -40 11 48 -35 19 24 -40 30 50 -35 0 3 -0.16 - 35 0 0 -37 47 51 15 12 32.5 6 93 48 -40 13 24 -35 21 8 -40 32 25 -35 1 47 -0.17 - 34 0 0 -37 48 52 15 12 32.9 6 92 48 -40 14 23 -35 22 11 -40 33 24 -35 2 51 -0.17 - 33 0 0 -37 49 16 15 12 33.3 7 91 48 -40 14 47 -35 22 36 -40 33 47 -35 3 16 -0.17 - 32 0 0 -37 49 3 15 12 33.8 8 91 47 -40 14 34 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.... .. .. .. .. .. .. .. .. .. .. .. .. 54 57 25 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 423-024904 * constellation : Monoceros * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 59 07.8489 DE: -05 28 33.801 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 59 07.8488 DE: -05 28 33.801 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2) Pallas asteroid class: ShapeModel approx. diameter [km]: 532 approx. diameter ["]: 0.422 distance from Earth [AU]: 1.73650 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.039", 0.015", 82.454° remarks: * orbital elements for (2)Pallas : Mean anomaly = 4.3990022608 deg Arg. of pericenter = 310.8665901228 deg Long. of node = 172.9184274145 deg Inclination = 34.9268731298 deg Eccentricity = 0.2301152205 Semimajor axis = 2.7697432870 AU Perihelion dist = 2.1323831996 AU Mag: H = 4.12, G = 0.11 Epoch of elements : MJD 60030.63673611 TDT (2023 Mar 27.6367) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Feb07,22.50,2023,3,27,15.282287,-0.131384,0.119695,8.992087,9.862635,0.005376,-0.000187,0.000000,-0.000001 51.0359,-5.5097,-47.88,2.66,False UCAC4 423-024904,6.98551361,-5.4760559,0.00,12.29,0.00,0.0,0,,7.00444430,-5.5097079,0.02,0.00,0,0,0 2,Pallas,8.19,532.0,1.7365,0,0,3.051,49.94,,28.2,0 0,4.2629,2023,3,27,310.8666,172.9184,34.9269,0.23012,2.76974,2.13238,4.12,5.0,0.15 1.066,0.0393,0.0147,82,0.0277,Known errors,-1.00,-1,-1,-1 20230327_024904,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org