_Manto.png) Modelled shape ofManto from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 12 May 1917 |
| Designations | |
| (870) Manto | |
| Pronunciation | /ˈmæntoʊ/ |
Named after | ΜαντώMantō(Greek mythology)[2] |
| A917 JC · 1935 NB 1935 QV · 1953 UE1 A907 TF · A914 UC 1917 BX · 1907 TF 1914 UC | |
| Adjectives | Mantoian/mænˈtoʊ.iən/[6] |
| Orbital characteristics[3] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 102.14yr (37,307 d) |
| Aphelion | 2.9379AU |
| Perihelion | 1.7065 AU |
| 2.3222 AU | |
| Eccentricity | 0.2651 |
| 3.54 yr (1,293 d) | |
| 343.87° | |
| 0° 16m 42.6s / day | |
| Inclination | 6.1928° |
| 120.80° | |
| 196.89° | |
| Physical characteristics | |
| 122.30±0.01 h[9] | |
| 11.7[1][3] | |
870 Manto (prov. designation:A917 JCor1917 BX) is a stonybackground asteroid andslow rotator from the inner region of theasteroid belt. It was discovered on 12 May 1917, by astronomerMax Wolf at theHeidelberg Observatory in southwest Germany.[1] The likely heavily elongatedS-type asteroid has a longrotation period of 122.3 hours and measures approximately 13 kilometers (8 miles) in diameter. It was named afterManto, a prophetess in Greek mythology.[2]
Manto is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[4][5] It orbits the Sun in theinner asteroid belt at a distance of 1.7–2.9 AU once every 3 years and 6 months (1,293 days;semi-major axis of 2.32 AU). Its orbit has aneccentricity of 0.27 and aninclination of 6° with respect to theecliptic.[3] The asteroid was first observed asA907 TF (1907 TF) at Taunton Observatory (803) on 11 October 1907, and again asA914 UC (1914 UC) at theSimeiz Observatory on 16 October 1914. The body'sobservation arc begins with its official discovery observation atHeidelberg Observatory on 12 May 1917.[1]
Thisminor planet was named afterManto fromGreek mythology. She was the daughter of Teresias Thebanus and a famous soothsayer, who erected of a temple of Apollo (Apollo Clarius) inClaros. Thenaming citation was also mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 85).[2]
Manto is a common stonyS-type asteroid in the Bus–BinzelSMASS classification, and in both the Tholen- and SMASS-like taxonomy of theSmall Solar System Objects Spectroscopic Survey (S3OS2).[3][5][10]
In September 2013, a rotationallightcurve ofManto was obtained fromphotometric observations byFrederick Pilcher at the Organ Mesa Observatory (G50), New Mexico, in collaboration with Eduardo Manuel Alvarez, Andrea Ferrero, Daniel Klinglesmith andJulian Oey Lightcurve analysis gave an exceptionally longrotation period of122.30±0.01 hours with a notably high brightness amplitude of0.80±0.05magnitude, indicative of an elongated shape (U=3).[9] With aperiod above 100 hours, the asteroid is aslow rotator. The result supersedes observations by Alain W. Harris from July 1981, and by astronomers at theIntermediate Palomar Transient Factory in California (U=1/1).[11]
In 2016, a modeled lightcurve gave a concurring sidereal period of122.166±0.005 hours using data from a large collaboration of individual observers (such as above). The study also determined twospin axes of (96.0°, 30.0°) and (283.0°, 35.0°) inecliptic coordinates (λ, β).[5][12]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer (WISE),Manto measures (11.87±0.16) and (13.683±0.236) kilometers in diameter and its surface has analbedo of (0.321±0.010) and (0.216±0.040), respectively.[7][8] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 13.71 kilometers based on anabsolute magnitude of 11.68.[11] The WISE team also published an alternative mean-diameter measurement of (11.009±3.486 km) with a corresponding albedo of (0.305±0.181).[5][11]
