IOTA/IOTA-ES occultation update for (177) Irma / TYC 5797-00859-1 event on 2024 Dec 22, 23:29 UT Visible from Summary ------- On 2024 Dec 22 UT, the 70.4330732979465 km diameter asteroid (177) Irma will occult a 9.5 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.04 mag to 14.54 mag (the magnitude of the asteroid) for at most 1.930 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 Dec 22, 23:26 - 2024 Dec 22, 23:32 * geocentric midpoint of event [JD]: 2460667.47875341 * magnitude of target star: 9.51 * magnitude drop [mag]: 5.04 * estimated maximum duration [s]: 1.930 * Moon: 49 % sunlit, 144° distance * Sun: 55° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 71 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.002", 69°) * approx speed of asteroid's shadow [km/s]: 36.5683 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5797-00859-1 by 177 Irma on 2024 Dec 22 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 153 0 0 -13 24 47 23 26 31.1 0 103 55 -13 44 33 -13 5 0 -13 47 6 -13 2 26 .... 154 0 0 -13 37 48 23 26 31.1 1 103 56 -13 57 33 -13 18 3 -14 0 6 -13 15 30 -0.03 155 0 0 -13 50 26 23 26 31.2 2 102 57 -14 10 9 -13 30 42 -14 12 42 -13 28 9 -0.07 156 0 0 -14 2 40 23 26 31.4 3 102 58 -14 22 21 -13 42 58 -14 24 54 -13 40 25 -0.09 157 0 0 -14 14 30 23 26 31.6 4 102 59 -14 34 10 -13 54 49 -14 36 42 -13 52 17 -0.09 158 0 0 -14 25 56 23 26 31.9 5 102 60 -14 45 34 -14 6 17 -14 48 6 -14 3 44 -0.10 159 0 0 -14 36 57 23 26 32.2 6 101 61 -14 56 34 -14 17 20 -14 59 6 -14 14 47 -0.10 160 0 0 -14 47 35 23 26 32.5 7 101 62 -15 7 10 -14 27 59 -15 9 42 -14 25 26 -0.11 161 0 0 -14 57 48 23 26 33.0 8 101 63 -15 17 22 -14 38 13 -15 19 54 -14 35 41 -0.11 162 0 0 -15 7 37 23 26 33.4 9 101 64 -15 27 10 -14 48 3 -15 29 41 -14 45 31 -0.11 163 0 0 -15 17 1 23 26 33.9 10 100 65 -15 36 33 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-0.12 - 61 0 0 18 39 45 23 31 56.9 28 244 -27 18 18 57 19 0 33 18 16 15 19 3 15 -0.12 - 60 0 0 19 2 44 23 31 58.4 27 245 -28 18 41 57 19 23 31 18 39 16 19 26 12 -0.12 - 59 0 0 19 25 25 23 31 59.7 26 245 -29 19 4 41 19 46 11 19 2 0 19 48 52 -0.12 - 58 0 0 19 47 50 23 32 1.1 25 245 -30 19 27 7 20 8 33 19 24 26 20 11 14 -0.12 - 57 0 0 20 9 56 23 32 2.3 24 246 -31 19 49 15 20 30 38 19 46 35 20 33 18 -0.12 - 56 0 0 20 31 44 23 32 3.5 23 246 -32 20 11 5 20 52 24 20 8 25 20 55 4 -0.12 - 55 0 0 20 53 14 23 32 4.7 22 246 -33 20 32 37 21 13 51 20 29 57 21 16 32 -0.12 - 54 0 0 21 14 25 23 32 5.8 21 247 -34 20 53 50 21 35 0 20 51 10 21 37 40 -0.12 - 53 0 0 21 35 16 23 32 6.9 20 247 -35 21 14 43 21 55 50 21 12 4 21 58 29 -0.12 - 52 0 0 21 55 48 23 32 7.8 19 248 -36 21 35 18 22 16 20 21 32 38 22 18 59 -0.12 - 51 0 0 22 16 1 23 32 8.8 18 248 -37 21 55 32 22 36 31 21 52 53 22 39 10 -0.12 - 50 0 0 22 35 53 23 32 9.7 17 248 -38 22 15 27 22 56 21 22 12 48 22 59 0 -0.12 - 49 0 0 22 55 26 23 32 10.5 16 249 -39 22 35 1 23 15 52 22 32 23 23 18 30 -0.12 - 48 0 0 23 14 38 23 32 11.3 15 249 -40 22 54 15 23 35 2 22 51 37 23 37 40 -0.12 - 47 0 0 23 33 30 23 32 12.0 14 250 -41 23 13 9 23 53 51 23 10 31 23 56 29 -0.12 - 46 0 0 23 52 0 23 32 12.7 13 250 -42 23 31 42 24 12 20 23 29 4 24 14 58 -0.12 - 45 0 0 24 10 10 23 32 13.3 12 250 -43 23 49 54 24 30 28 23 47 17 24 33 5 -0.12 - 44 0 0 24 27 59 23 32 13.9 11 251 -44 24 7 45 24 48 15 24 5 8 24 50 52 -0.12 - 43 0 0 24 45 27 23 32 14.4 10 251 -45 24 25 14 25 5 40 24 22 38 25 8 17 -0.12 - 42 0 0 25 2 33 23 32 14.9 9 252 -46 24 42 23 25 22 44 24 39 46 25 25 21 -0.12 - 41 0 0 25 19 18 23 32 15.3 8 252 -47 24 59 9 25 39 27 24 56 33 25 42 4 -0.12 - 40 0 0 25 35 41 23 32 15.7 7 253 -48 25 15 35 25 55 48 25 12 59 25 58 24 -0.12 - 39 0 0 25 51 42 23 32 16.0 6 253 -49 25 31 38 26 11 48 25 29 2 26 14 24 -0.12 - 38 0 0 26 7 22 23 32 16.3 5 253 -49 25 47 20 26 27 25 25 44 44 26 30 1 -0.12 - 37 0 0 26 22 40 23 32 16.5 4 254 -50 26 2 39 26 42 41 26 0 4 26 45 17 -0.11 - 36 0 0 26 37 36 23 32 16.7 3 254 -51 26 17 37 26 57 35 26 15 2 27 0 10 -0.11 - 35 0 0 26 52 9 23 32 16.9 2 255 -52 26 32 13 27 12 7 26 29 38 27 14 42 -0.11 - 34 0 0 27 6 21 23 32 16.9 1 255 -53 26 46 26 27 26 17 26 43 52 27 28 51 -0.10 - 33 0 0 27 20 11 23 32 17.0 0 256 -54 27 0 18 27 40 4 26 57 44 27 42 39 -0.06 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: TYC 5797-00859-1 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 55 24.9751 DE: -12 36 45.849 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 55 24.9747 DE: -12 36 45.851 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.5 * B mag [mag]: 9.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (177) Irma asteroid class: approx. diameter [km]: 70 approx. diameter ["]: 0.037 distance from Earth [AU]: 2.61870 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#110 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): 0.011", 0.002", 69.101° remarks: * orbital elements for (177)Irma : Mean anomaly = 336.0873931027 deg Arg. of pericenter = 39.6886423766 deg Long. of node = 346.9275313030 deg Inclination = 1.3815538415 deg Eccentricity = 0.2342103820 Semimajor axis = 2.7703545363 AU Perihelion dist = 2.1215087420 AU Mag: H = 9.68, G = 0.15 Epoch of elements : MJD 60666.97875341 TDT (2024 Dec 22.9788) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1102023Apr24,1.93,2024,12,22,23.490082,-0.043567,0.118045,19.296618,7.325137,0.004408,0.001603,-0.000001,0.000000 -115.1718,-12.4959,-172.59,-23.43,False TYC 5797-00859-1,21.92360424,-12.6127355,9.82,9.51,9.34,0.1,0,,21.94580960,-12.4959324,5.04,4.76,0,0,0 177,Irma,14.54,70.623,2.6187,0,0,4.425,24.60,,3.4,0 0,335.8782,2024,12,22,39.6886,346.9275,1.3816,0.23421,2.77035,2.12151,9.68,5.0,0.15 1.065,0.0107,0.0024,69,0.0024,Known errors,0.95,0,-1,-1 20241222_0859-1,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org