IOTA/IOTA-ES occultation update for (331) Etheridgea / UCAC4 316-086041 event on 2024 Sep 02, 14:22 UT Visible from Summary ------- On 2024 Sep 02 UT, the 75.073 km diameter asteroid (331) Etheridgea will occult a 11.8 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.76 mag to 15.48 mag (the magnitude of the asteroid) for at most 4.120 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: 2024 Sep 02, 14:16 - 2024 Sep 02, 14:28 * geocentric midpoint of event [JD]: 2460556.09874429 * magnitude of target star: 11.75 * magnitude drop [mag]: 3.76 * estimated maximum duration [s]: 4.120 * Moon: 0 % sunlit, 92° distance * Sun: 86° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 75 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.004", 104°) * approx speed of asteroid's shadow [km/s]: 18.2369 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 316-086041 by 331 Etheridgea on 2024 Sep 2 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 - 43 0 0 .. .. .... .. .. .. .. .. .. - 0 23 1 .. .. .. - 0 28 45 .. .. .. .... - 42 0 0 - 0 30 45 14 16 23.2 1 117 79 - 0 53 45 - 0 7 45 - 0 59 29 - 0 2 2 .... - 41 0 0 - 1 1 36 14 16 23.4 2 117 79 - 1 24 38 - 0 38 36 - 1 30 23 - 0 32 52 0.15 - 40 0 0 - 1 32 36 14 16 23.7 3 117 79 - 1 55 39 - 1 9 34 - 2 1 24 - 1 3 50 0.14 - 39 0 0 - 2 3 43 14 16 24.2 4 117 79 - 2 26 47 - 1 40 40 - 2 32 33 - 1 34 56 0.13 - 38 0 0 - 2 34 57 14 16 24.8 5 117 79 - 2 58 2 - 2 11 53 - 3 3 47 - 2 6 8 0.13 - 37 0 0 - 3 6 16 14 16 25.5 7 117 79 - 3 29 22 - 2 43 11 - 3 35 7 - 2 37 26 0.12 - 36 0 0 - 3 37 39 14 16 26.4 8 117 79 - 4 0 46 - 3 14 33 - 4 6 32 - 3 8 48 0.12 - 35 0 0 - 4 9 7 14 16 27.4 9 117 78 - 4 32 14 - 3 46 0 - 4 38 0 - 3 40 15 0.12 - 34 0 0 - 4 40 37 14 16 28.5 10 117 78 - 5 3 45 - 4 17 30 - 5 9 31 - 4 11 44 0.12 - 33 0 0 - 5 12 9 14 16 29.8 11 116 77 - 5 35 18 - 4 49 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24 -10 12 18 -11 4 9 -10 6 34 0.26 139 0 0 -10 4 40 14 27 59.3 0 243 -85 -10 27 44 - 9 41 37 -10 33 29 - 9 35 53 0.77 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 316-086041 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 12 21.9470 DE: -26 50 32.792 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 12 21.9468 DE: -26 50 32.792 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (331) Etheridgea asteroid class: approx. diameter [km]: 75 approx. diameter ["]: 0.036 distance from Earth [AU]: 2.90020 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 date of fit: 2023 Apr 24 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): 0.014", 0.004", 103.609° remarks: * orbital elements for (331)Etheridgea : Mean anomaly = 280.7831821380 deg Arg. of pericenter = 334.1856387415 deg Long. of node = 21.8449805563 deg Inclination = 6.0351712312 deg Eccentricity = 0.0955762644 Semimajor axis = 3.0271922399 AU Perihelion dist = 2.7378645139 AU Mag: H = 9.80, G = 0.15 Epoch of elements : MJD 60555.59874400 TDT (2024 Sep 02.5987) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,4.12,2024,9,2,14.369863,-0.008565,-0.096658,10.246005,-0.986688,0.005610,-0.001061,0.000000,0.000000 45.6940,-26.9069,-35.67,7.59,False UCAC4 316-086041,16.20609643,-26.8424424,12.30,11.75,11.45,0.0,0,,16.23120215,-26.9069467,3.77,3.62,0,0,0 331,Etheridgea,15.48,75.073,2.9002,0,0,2.323,-2.99,,4.8,0 0,280.6711,2024,9,2,334.1856,21.8450,6.0352,0.09558,3.02719,2.73786,9.80,5.0,0.15 1.125,0.0143,0.0040,104,0.0045,Known errors,0.96,0,-1,-1 20240902_086041,60140.54 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 12:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org