EXPLORENEOs. VIII. DORMANT SHORT-PERIOD COMETS IN THE NEAR-EARTH ASTEROID POPULATION
EXPLORENEOs. VIII. DORMANT SHORT-PERIOD COMETS IN THE NEAR-EARTH ASTEROID POPULATION
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探索NEO。
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
H. Smith
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作者：
Michael Mommert;A. Harris;M. Mueller;J. Hora;D. Trilling;W. Bottke;C. Thomas;M. Delbo’;J. Emery;G. Fazio;H. Smith
我们基于动力学和物理考虑，在近地小行星(NEA)种群中搜索休眠彗星，即起源于彗星的小行星对象。我们的研究是基于ExplreNEOS计划中得出的反照率，并通过添加来自NEOWISE和Akari小行星星表的数据进行了扩展。我们使用一种统计方法来识别轨道上类似于短周期近地彗星(NECS)的小行星，使用相对于木星的Tisserand参数、远日点距离和相对于木星的最小轨道相交距离。从类彗星轨道上的近地小行星样本中，我们选择了几何反照率PV≤为0.064的近地小行星作为休眠彗星候选，发现只有∼50%的类彗星轨道上的近地小行星也有类彗星反照率。我们从我们的样本中确定了总共23个近地天体，它们可能是休眠的短周期NEC，并基于应用于低温NEOWISE调查的去偏向程序，估计了NEA种群中数量有限和大小受限的部分是休眠的短周期彗星。我们发现，有0.3%-3.3%的N EA种群具有H≤2 1，和(9−5+2)？gt；%的种群直径d≥1 KM是休眠的短周期NEC。
We perform a search for dormant comets, asteroidal objects of cometary origin, in the near-Earth asteroid (NEA) population based on dynamical and physical considerations. Our study is based on albedos derived within the ExploreNEOs program and is extended by adding data from NEOWISE and the Akari asteroid catalog. We use a statistical approach to identify asteroids on orbits that resemble those of short-period near-Earth comets (NECs) using the Tisserand parameter with respect to Jupiter, the aphelion distance, and the minimum orbital intersection distance with respect to Jupiter. From the sample of NEAs on comet-like orbits, we select those with a geometric albedo pV ≤ 0.064 as dormant comet candidates, and find that only ∼50% of NEAs on comet-like orbits also have comet-like albedos. We identify a total of 23 NEAs from our sample that are likely to be dormant short-period NECs and, based on a de-biasing procedure applied to the cryogenic NEOWISE survey, estimate both magnitude-limited and size-limited fractions of the NEA population that are dormant short-period comets. We find that 0.3%–3.3% of the NEA population with H ≤ 21, and ( 9 − 5 + 2 ) ?> % of the population with diameters d ≥ 1 km, are dormant short-period NECs.