IOTA/IOTA-ES occultation update for (10) Hygiea / UCAC4-377-169291 event on 2023 Apr 30, 05:39 UT Visible from South America Summary ------- On 2023 Apr 30 UT, the 419.9 km diameter asteroid (10) Hygiea will occult a 12.5 mag star in the constellation Capricornus 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 0.31 mag to 11.26 mag (the magnitude of the asteroid) for at most 20.230 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 30, 05:33 - 2023 Apr 30, 05:44 * geocentric midpoint of event [JD]: 2460064.73547537 * magnitude of target star: 12.45 * magnitude drop [mag]: 0.31 * estimated maximum duration [s]: 20.230 * Moon: 71 % sunlit, 162° distance * Sun: 82° distance * rough path description: South America Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 422 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.007", 69°) * approx speed of asteroid's shadow [km/s]: 20.7604 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-377-169291 by 10 Hygiea on 2023 Apr 30 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 - 76 0 0 .. .. .... .. .. .. .. .. .. -17 17 9 .. .. .. -17 25 5 .. .. .. .... - 75 0 0 -15 34 27 5 33 59.8 1 105 -81 -17 32 39 -13 35 48 -17 40 34 -13 27 49 .... - 74 0 0 -15 49 43 5 34 0.0 2 105 -80 -17 47 43 -13 51 17 -17 55 38 -13 43 19 -0.02 - 73 0 0 -16 4 35 5 34 0.2 3 104 -79 -18 2 23 -14 6 21 -18 10 16 -13 58 23 -0.05 - 72 0 0 -16 19 1 5 34 0.5 4 104 -78 -18 16 37 -14 20 58 -18 24 30 -14 13 2 -0.07 - 71 0 0 -16 33 1 5 34 0.9 5 104 -77 -18 30 26 -14 35 10 -18 38 18 -14 27 14 -0.07 - 70 0 0 -16 46 36 5 34 1.3 6 104 -76 -18 43 49 -14 48 56 -18 51 41 -14 41 1 -0.08 - 69 0 0 -16 59 45 5 34 1.9 7 103 -75 -18 56 47 -15 2 16 -19 4 38 -14 54 22 -0.08 - 68 0 0 -17 12 28 5 34 2.6 8 103 -74 -19 9 20 -15 15 10 -19 17 10 -15 7 16 -0.09 - 67 0 0 -17 24 45 5 34 3.3 9 103 -73 -19 21 26 -15 27 37 -19 29 16 -15 19 45 -0.09 - 66 0 0 -17 36 36 5 34 4.2 10 102 -72 -19 33 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Uncertainty in time = +/- 2 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: UCAC4-377-169291 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 17 50.6248 DE: -14 43 42.469 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 17 50.6250 DE: -14 43 42.468 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (10) Hygiea asteroid class: ShapeModel approx. diameter [km]: 420 approx. diameter ["]: 0.199 distance from Earth [AU]: 2.91320 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#110 date of fit: 2022 Nov 25 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): 0.020", 0.007", 68.544° remarks: * orbital elements for (10)Hygiea : Mean anomaly = 51.1252281950 deg Arg. of pericenter = 312.4767512698 deg Long. of node = 283.1732708398 deg Inclination = 3.8318003294 deg Eccentricity = 0.1111197340 Semimajor axis = 3.1400413229 AU Perihelion dist = 2.7911207665 AU Mag: H = 5.60, G = 0.15 Epoch of elements : MJD 60064.23541667 TDT (2023 Apr 30.2354) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1102022Nov25,20.23,2023,4,30,5.651409,-0.040309,0.098871,10.868773,4.378926,-0.005375,-0.001702,0.000000,0.000000 17.0946,-14.6322,94.56,14.70,False UCAC4-377-169291,21.29739576,-14.7284636,0.00,12.45,0.00,0.0,0,,21.31857317,-14.6321666,0.31,0.00,0,0,0 10,Hygiea,11.26,419.9,2.9132,0,0,2.261,13.22,,24.0,0 0,51.0835,2023,4,30,312.4768,283.1733,3.8318,0.11112,3.14004,2.79112,5.60,5.0,0.15 1.034,0.0197,0.0067,69,0.0067,Known errors,-1.00,-1,-1,-1 20230430_169291,60004.06 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org