IOTA/IOTA-ES occultation update for (406) Erna / UCAC4 327-138170 event on 2024 Oct 03, 10:17 UT Visible from Summary ------- On 2024 Oct 03 UT, the 47.072 km diameter asteroid (406) Erna will occult a 12.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.53 mag to 15.46 mag (the magnitude of the asteroid) for at most 2.310 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: 93 * date and approx. time of event: 2024 Oct 03, 10:12 - 2024 Oct 03, 10:22 * geocentric midpoint of event [JD]: 2460586.92880600 * magnitude of target star: 11.97 * magnitude drop [mag]: 3.53 * estimated maximum duration [s]: 2.310 * Moon: 0 % sunlit, 77° distance * Sun: 84° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 48 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.012", 84°) * approx speed of asteroid's shadow [km/s]: 20.4150 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 327-138170 by 406 Erna on 2024 Oct 3 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 13 0 0 -15 29 6 10 12 20.7 0 116 74 -15 43 28 -15 14 44 -15 56 57 -15 1 16 .... 14 0 0 -15 56 56 10 12 20.8 1 115 75 -16 11 18 -15 42 34 -16 24 46 -15 29 8 0.22 15 0 0 -16 24 36 10 12 21.0 2 115 75 -16 38 57 -16 10 15 -16 52 25 -15 56 49 0.20 16 0 0 -16 52 4 10 12 21.3 4 115 75 -17 6 25 -16 37 44 -17 19 52 -16 24 19 0.19 17 0 0 -17 19 21 10 12 21.7 5 114 75 -17 33 41 -17 5 2 -17 47 8 -16 51 38 0.19 18 0 0 -17 46 26 10 12 22.2 6 114 75 -18 0 45 -17 32 8 -18 14 10 -17 18 44 0.18 19 0 0 -18 13 17 10 12 22.9 7 114 75 -18 27 35 -17 59 0 -18 41 0 -17 45 37 0.18 20 0 0 -18 39 55 10 12 23.6 8 114 75 -18 54 12 -18 25 39 -19 7 36 -18 12 17 0.18 21 0 0 -19 6 19 10 12 24.4 9 113 75 -19 20 35 -18 52 4 -19 33 58 -18 38 43 0.18 22 0 0 -19 32 28 10 12 25.4 10 113 75 -19 46 43 -19 18 14 -20 0 5 -19 4 54 0.18 23 0 0 -19 58 21 10 12 26.4 11 113 74 -20 12 35 -19 44 8 -20 25 56 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245 -80 - 3 21 52 - 2 53 13 - 3 35 18 - 2 39 49 0.25 -164 0 0 - 2 39 17 10 22 36.9 2 245 -81 - 2 53 36 - 2 24 59 - 3 7 1 - 2 11 36 0.28 -163 0 0 - 2 11 13 10 22 37.1 1 245 -82 - 2 25 30 - 1 56 56 - 2 38 55 - 1 43 33 0.38 -162 0 0 - 1 43 20 10 22 37.2 0 245 -83 - 1 57 36 - 1 29 4 - 2 11 0 .. .. .. 2.41 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 327-138170 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 20 54.3600 DE: -24 41 42.331 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 20 54.3600 DE: -24 41 42.331 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.0 * B mag [mag]: 12.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (406) Erna asteroid class: approx. diameter [km]: 47 approx. diameter ["]: 0.026 distance from Earth [AU]: 2.46560 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.028", 0.012", 84.086° remarks: * orbital elements for (406)Erna : Mean anomaly = 319.7986483216 deg Arg. of pericenter = 37.9142235579 deg Long. of node = 315.4369692320 deg Inclination = 4.1915496918 deg Eccentricity = 0.1779372799 Semimajor axis = 2.9177085763 AU Perihelion dist = 2.3985394489 AU Mag: H = 10.37, G = 0.15 Epoch of elements : MJD 60586.42880563 TDT (2024 Oct 03.4288) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,2.31,2024,10,3,10.291344,0.020927,-0.160756,11.424297,1.503471,0.005661,0.000207,0.000000,0.000000 108.6219,-24.6849,22.85,-4.24,False UCAC4 327-138170,18.34843337,-24.6950919,12.67,11.97,11.59,0.0,0,,18.37369101,-24.6849415,3.53,3.46,0,0,1 406,Erna,15.46,47.072,2.4656,0,0,2.990,5.37,,2.4,0 0,319.7138,2024,10,3,37.9142,315.4370,4.1915,0.17794,2.91771,2.39854,10.36,5.0,0.15 1.469,0.0283,0.0123,84,0.0124,Known errors,0.70,0,-1,-1 20241003_138170,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org