IOTA/IOTA-ES occultation update for (122) Gerda / TYC 1327-00488-1 event on 2024 Aug 15, 08:23 UT Visible from Summary ------- On 2024 Aug 15 UT, the 78.059 km diameter asteroid (122) Gerda will occult a 11.1 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.90 mag to 13.94 mag (the magnitude of the asteroid) for at most 2.190 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: 2024 Aug 15, 08:20 - 2024 Aug 15, 08:26 * geocentric midpoint of event [JD]: 2460537.84970421 * magnitude of target star: 11.12 * magnitude drop [mag]: 2.90 * estimated maximum duration [s]: 2.190 * Moon: 76 % sunlit, 169° distance * Sun: 49° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 89 * 1 sigma uncertainty interval [path widths]: +/- 0.09 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.003", 91°) * approx speed of asteroid's shadow [km/s]: 35.6363 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1327-00488-1 by 122 Gerda on 2024 Aug 15 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 - 74 0 0 -24 35 37 8 20 58.3 0 66 -42 .. .. .. -24 9 7 .. .. .. -24 4 14 .... - 73 0 0 -24 10 52 8 20 58.3 1 65 -41 -24 37 28 -23 44 24 -24 42 24 -23 39 31 0.13 - 72 0 0 -23 46 13 8 20 58.4 2 65 -40 -24 12 47 -23 19 46 -24 17 42 -23 14 54 0.34 - 71 0 0 -23 21 39 8 20 58.5 3 64 -39 -23 48 12 -22 55 15 -23 53 7 -22 50 23 0.41 - 70 0 0 -22 57 13 8 20 58.8 4 64 -38 -23 23 43 -22 30 50 -23 28 37 -22 25 58 0.44 - 69 0 0 -22 32 53 8 20 59.0 5 64 -37 -22 59 21 -22 6 33 -23 4 16 -22 1 41 0.47 - 68 0 0 -22 8 42 8 20 59.4 6 63 -36 -22 35 8 -21 42 24 -22 40 2 -21 37 33 0.48 - 67 0 0 -21 44 40 8 20 59.8 7 63 -35 -22 11 4 -21 18 24 -22 15 57 -21 13 33 0.49 - 66 0 0 -21 20 47 8 21 0.3 8 63 -34 -21 47 8 -20 54 33 -21 52 2 -20 49 43 0.50 - 65 0 0 -20 57 4 8 21 0.8 9 62 -33 -21 23 23 -20 30 52 -21 28 16 -20 26 3 0.51 - 64 0 0 -20 33 32 8 21 1.4 10 62 -32 -20 59 49 -20 7 23 -21 4 41 -20 2 33 0.51 - 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 1327-00488-1 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 17 57.0565 DE: +21 59 48.355 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 17 57.0565 DE: +21 59 48.355 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (122) Gerda asteroid class: Barbarian approx. diameter [km]: 78 approx. diameter ["]: 0.029 distance from Earth [AU]: 3.76570 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 date of fit: 2023 Feb 11 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): 0.021", 0.003", 91.389° remarks: * orbital elements for (122)Gerda : Mean anomaly = 306.3100221225 deg Arg. of pericenter = 318.3881746378 deg Long. of node = 178.0269505332 deg Inclination = 1.6425427000 deg Eccentricity = 0.0248205377 Semimajor axis = 3.2327042495 AU Perihelion dist = 3.1524667917 AU Mag: H = 7.75, G = 0.15 Epoch of elements : MJD 60537.34970284 TDT (2024 Aug 15.3497) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Feb11,2.19,2024,8,15,8.392901,-0.022533,-0.487973,20.091223,-0.959115,-0.004265,0.000056,-0.000001,0.000000 4.7216,21.9883,55.22,13.85,False TYC 1327-00488-1,6.29918232,21.9967653,11.22,11.12,11.07,0.0,0,,6.32360102,21.9883401,2.89,2.53,0,0,0 122,Gerda,13.94,78.059,3.7657,0,0,3.374,-2.24,,4.4,0 0,306.2507,2024,8,15,318.3882,178.0270,1.6425,0.02482,3.23270,3.15247,7.75,5.0,0.15 1.092,0.0210,0.0026,91,0.0026,Known errors,1.11,0,-1,-1 20240815_0488-1,60140.25 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org