Комета Темпль 2

Следовательно, вещество протяженного хвоста должно представлять собой пыль и, вероятно, имеет силикатный состав; оно истекает из кометы со скоростью 200 кг в секунду — быстрее, чем по сделанным ранее оценкам.

К концу полета спутника ИРАС были открыты еще четыре кометы; кроме того, наблюдалась комета Темпль 2, известная по 16 прошлым появлениям во внутренней части Солнечной системы. В видимой области Темпль 2 не имела хвоста; считалось, что весь летучий материал был выметен во время предыдущих пролетов около Солнца. Изображения со спутника ИРАС показывают длинный тонкий хвост, простирающийся на 30 млн. км от ядра кометы.

Кометообразное тело, открытое II октября, помогло разрешить одну из загадок. Сначала тело, получившее обозначение 1983 ТВ, было принято за астероид типа так называемых аполлонидов; траектории аполлонидов заходят внутрь орбиты Земли. Перигелий 1983 ТВ был даже внутри орбиты Меркурия в пределах 20 млн. км от поверхности Солнца. Вскоре стало ясно, что орбита 1983 ТВ близка к орбитам Геминид, создающих ежегодный метеорный поток в декабре. Другие метеорные потоки создаются остатками комет, но источник Геминид неизвестен. Поскольку 1983 ТВ является, по-видимому, родительским телом Геминид, его теперь можно считать не астероидом, а остатком кометы.

ДРУГОЙ объект Солнечной системы, обнаруженный со спутника ИРАС, — это возможная десятая планета, находящаяся за орбитой Плутона. Предположения о ее существовании не раз делались раньше для объяснения аномалий в движении Нептуна; ИК- излучение является наиболее явным признаком такой планеты. Если десятая планета существует, то ее скорее всего надо искать среди точечных источников, обнаруженных спутником ИРАС и не отождествленных с известными объектами.

Возможно, самый большой сюрприз ИРАС преподнес в начале полета, когда инструменты спутника калибровались по наблюдениям ярких близких звезд. Одной их этих «стандартных свечей» была молодая горячая звезда Вега, или Альфа Лиры.

 

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