IOTA/IOTA-ES occultation update for (15) Eunomia / UCAC4 323-206917 event on 2023 Jun 25, 17:06 UT Visible from Australia Summary ------- On 2023 Jun 25 UT, the 248.3 km diameter asteroid (15) Eunomia will occult a 12.2 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.07 mag to 9.18 mag (the magnitude of the asteroid) for at most 21.710 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 Jun 25, 16:57 - 2023 Jun 25, 17:16 * geocentric midpoint of event [JD]: 2460121.21317609 * magnitude of target star: 12.20 * magnitude drop [mag]: 0.07 * estimated maximum duration [s]: 21.710 * Moon: 44 % sunlit, 111° distance * Sun: 165° distance * rough path description: Australia Additional comments ------------------- very low mag drop The occultation path -------------------- * approximate projected width [km]: 250 * 1 sigma uncertainty interval [path widths]: +/- 0.09 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.017) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.015", 71°) * approx speed of asteroid's shadow [km/s]: 11.4397 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 323-206917 by 15 Eunomia on 2023 Jun 25 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 28 0 0 .. .. .... .. .. .. .. .. .. .. .. .. - 0 12 20 .. .. .. - 0 26 24 .... 29 0 0 0 33 51 17 16 12.1 1 116 -16 1 48 52 - 0 41 21 2 2 53 - 0 55 26 .... 30 0 0 0 4 45 17 16 11.8 2 116 -17 1 19 51 - 1 10 32 1 33 52 - 1 24 38 0.14 31 0 0 - 0 24 30 17 16 11.3 3 116 -18 0 50 40 - 1 39 51 1 4 42 - 1 53 57 0.13 32 0 0 - 0 53 53 17 16 10.5 4 116 -19 0 21 21 - 2 9 17 0 35 24 - 2 23 25 0.12 33 0 0 - 1 23 23 17 16 9.6 5 116 -20 - 0 8 6 - 2 38 51 0 5 58 - 2 52 59 0.12 34 0 0 - 1 52 59 17 16 8.5 7 116 -21 - 0 37 39 - 3 8 30 - 0 23 35 - 3 22 39 0.11 35 0 0 - 2 22 41 17 16 7.1 8 115 -22 - 1 7 18 - 3 38 15 - 0 53 13 - 3 52 24 0.11 36 0 0 - 2 52 27 17 16 5.6 9 115 -23 - 1 37 2 - 4 8 4 - 1 22 57 - 4 22 14 0.11 37 0 0 - 3 22 18 17 16 3.8 10 115 -25 - 2 6 50 - 4 37 57 - 1 52 45 - 4 52 7 0.11 38 0 0 - 3 52 12 17 16 1.8 11 115 -26 - 2 36 42 - 5 7 52 - 2 22 36 - 5 22 3 0.11 39 0 0 - 4 22 8 17 15 59.7 12 115 -27 - 3 6 37 - 5 37 50 - 2 52 31 - 5 52 1 0.11 40 0 0 - 4 52 5 17 15 57.3 13 115 -28 - 3 36 33 - 6 7 49 - 3 22 27 - 6 22 0 0.11 41 0 0 - 5 22 4 17 15 54.7 14 115 -29 - 4 6 30 - 6 37 48 - 3 52 24 - 6 51 59 0.11 42 0 0 - 5 52 2 17 15 51.9 15 115 -30 - 4 36 28 - 7 7 47 - 4 22 22 - 7 21 58 0.11 43 0 0 - 6 21 59 17 15 49.0 17 115 -31 - 5 6 25 - 7 37 44 - 4 52 19 - 7 51 55 0.11 44 0 0 - 6 51 55 17 15 45.8 18 115 -32 - 5 36 21 - 8 7 40 - 5 22 15 - 8 21 51 0.11 45 0 0 - 7 21 48 17 15 42.5 19 115 -33 - 6 6 15 - 8 37 33 - 5 52 8 - 8 51 44 0.11 46 0 0 - 7 51 38 17 15 38.9 20 114 -34 - 6 36 6 - 9 7 22 - 6 21 59 - 9 21 33 0.10 47 0 0 - 8 21 24 17 15 35.2 21 114 -36 - 7 5 53 - 9 37 7 - 6 51 47 - 9 51 17 0.10 48 0 0 - 8 51 5 17 15 31.3 22 114 -37 - 7 35 35 -10 6 47 - 7 21 30 -10 20 57 0.10 49 0 0 - 9 20 41 17 15 27.2 23 114 -38 - 8 5 13 -10 36 21 - 7 51 7 -10 50 31 0.10 50 0 0 - 9 50 11 17 15 22.9 24 114 -39 - 8 34 44 -11 5 48 - 8 20 39 -11 19 58 0.10 51 0 0 -10 19 33 17 15 18.5 25 114 -40 - 9 4 9 -11 35 8 - 8 50 4 -11 49 17 0.10 52 0 0 -10 48 48 17 15 13.9 26 113 -41 - 9 33 27 -12 4 20 - 9 19 22 -12 18 29 0.10 53 0 0 -11 17 54 17 15 9.1 27 113 -42 -10 2 36 -12 33 24 - 9 48 32 -12 47 32 0.10 54 0 0 -11 46 52 17 15 4.2 28 113 -43 -10 31 36 -13 2 18 -10 17 33 -13 16 25 0.10 55 0 0 -12 15 39 17 14 59.1 30 113 -44 -11 0 28 -13 31 2 -10 46 25 -13 45 9 0.10 56 0 0 -12 44 16 17 14 53.9 31 112 -45 -11 29 8 -13 59 35 -11 15 7 -14 13 41 0.10 57 0 0 -13 12 42 17 14 48.5 32 112 -46 -11 57 39 -14 27 57 -11 43 38 -14 42 3 0.11 58 0 0 -13 40 57 17 14 43.0 33 112 -47 -12 25 57 -14 56 7 -12 11 57 -15 10 12 0.11 59 0 0 -14 8 59 17 14 37.3 34 112 -48 -12 54 4 -15 24 5 -12 40 5 -15 38 8 0.11 60 0 0 -14 36 48 17 14 31.5 35 111 -49 -13 21 58 -15 51 49 -13 8 0 -16 5 52 0.11 61 0 0 -15 4 24 17 14 25.5 36 111 -50 -13 49 39 -16 19 20 -13 35 42 -16 33 22 0.11 62 0 0 -15 31 46 17 14 19.5 37 111 -51 -14 17 6 -16 46 36 -14 3 10 -17 0 37 0.11 63 0 0 -15 58 53 17 14 13.3 38 110 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Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 323-206917 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 19 26.9064 DE: -25 35 23.283 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 19 26.9064 DE: -25 35 23.283 * position source: Gaia DR3 * 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: (15) Eunomia asteroid class: ShapeModel approx. diameter [km]: 248 approx. diameter ["]: 0.199 distance from Earth [AU]: 1.72280 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#93 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): 0.029", 0.015", 71.156° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 271.8116436052 deg Arg. of pericenter = 98.7401360976 deg Long. of node = 292.9065831747 deg Inclination = 11.7543584653 deg Eccentricity = 0.1870610916 Semimajor axis = 2.6428294164 AU Perihelion dist = 2.1484588610 AU Mag: H = 5.38, G = 0.23 Epoch of elements : MJD 60120.71312500 TDT (2023 Jun 25.7131) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932023Apr24,21.71,2023,6,25,17.116226,-0.015755,-0.115254,-6.397195,0.875831,-0.001366,0.000127,0.000001,0.000000 119.9016,-25.5464,-76.07,23.38,False UCAC4 323-206917,19.32414067,-25.5898008,0.00,12.20,0.00,0.0,0,,19.34835976,-25.5464281,0.07,0.00,0,0,0 15,Eunomia,9.18,248.3,1.7228,0,0,-2.413,4.47,,14.4,0 0,271.6481,2023,6,25,98.7401,292.9066,11.7544,0.18706,2.64283,2.14846,5.38,5.0,0.15 1.093,0.0287,0.0150,71,0.0186,Known errors,-1.00,-1,-1,-1 20230625_206917,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org