_Maartje.png) Modelled shape of Maartje from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | H. van Gent |
| Discovery site | Johannesburg Obs. |
| Discovery date | 13 February 1935 |
| Designations | |
| (1353) Maartje | |
Named after | Maartje Mekking [2] (daughter of Dutch orbit computer B. G. Mekking) |
| 1935 CU · 1931 ME 1953 TZ2 · A910 LB A916 QB · A920 JC | |
| main-belt · (outer) Eos[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 97.48 yr (35,606 days) |
| Aphelion | 3.2988AU |
| Perihelion | 2.7210 AU |
| 3.0099 AU | |
| Eccentricity | 0.0960 |
| 5.22yr (1,907 days) | |
| 134.16° | |
| 0° 11m 19.32s / day | |
| Inclination | 9.2032° |
| 211.79° | |
| 98.471° | |
| Physical characteristics | |
| Dimensions | 33.75±3.9 km[5] 34.16 km(derived)[3] 37.16±10.25 km[6] 38.13±0.79 km[7] 39.013±0.534 km[8] 39.55±0.68 km[9] 42.175±0.390 km[10] |
| 12h[11] 18 h[11] 22.930±0.001 h(best)[12] 22.98±0.05 h[11] 22.9924±0.0002 h[13][a] 22.9926 h[14] | |
| 0.0687±0.0045[10] 0.088±0.004[7] 0.1073±0.030[5] 0.13±0.06[6] 0.136±0.015[9] 0.1660(derived)[3] | |
| LS[15] · S(assumed)[3] | |
| 9.80[9] · 9.9[3] · 10.0[1] · 10.01[6] · 10.01±0.09[15] · 10.40[5][7][10] | |
1353 Maartje, provisional designation1935 CU, is an Eoanasteroid from the outer regions of theasteroid belt, approximately 37 kilometers in diameter. It was discovered on 13 February 1935, by Dutch astronomerHendrik van Gent at theUnion Observatory in Johannesburg, South Africa.[16] The asteroid was named after Maartje Mekking, daughter of a staff member at the DutchLeiden Observatory.[2]
Maartje is a member theEos family (606),[3][4] the largestasteroid family in theouter main belt consisting of nearly 10,000 known members.[17]: 23 It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,907 days;semi-major axis of 3.01 AU). Its orbit has aneccentricity of 0.10 and aninclination of 9° with respect to theecliptic.[1]
In June 1910, the asteroid was first identified asA910 LB at theHeidelberg Observatory in Germany, where the body'sobservation arc begins with its identification asA920 JC in May 1920, almost 15 years prior to its official discovery observation at Johannesburg.[16]
Thisminor planet was named after Maartje (Nin) Maria Lindenburg Mekking (1924–2007), daughter of B.G. Mekking (1903–1971), an orbit computer at theLeiden Observatory. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 123).[2]
Maartje has been characterized as anL- andS-type asteroid byPanSTARRS photometric survey,[15] while the overallspectral type of the Eos family is that of aK-type.[17]: 23
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Several rotationallightcurve of Maartje have been obtained from photometric observations since 2005.[11][12] Lightcurve analysis gave a consolidated, slightly longer-than average, and well-definedrotation period of 22.930 hours with a brightness amplitude between 0.25 and 0.46magnitude (U=3).[3] The asteroid's lightcurve has also been modeled and gave two concurring periods of 22.9924 and 22.9926 hours.[13][14][a] Modeling in 2018 determined twospin axis of (285.0°, 73.0°) and (119.0°, 41.0°) inecliptic coordinates (λ, β).[13]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, Maartje measures between 33.75 and 42.175 kilometers in diameter and its surface has analbedo between 0.0687 and 0.136.[5][6][7][8][9][10]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1660 and a diameter of 34.16 kilometers based on anabsolute magnitude of 9.9.[3]
