HK meaning in Space Science ?

Housekeeping refers to the management of duties and chores involved in the running of a household, such as cleaning, cooking, home maintenance, shopping, and bill payment. These tasks may be performed by members of the household, or by other persons hired for the purpose. This is a more broad role than a cleaner, who is focussed only on the cleaning aspect. The term is also used to refer to the money allocated for such use. By extension, it may also refer to an office or organization, as well as the maintenance of computer storage systems.

A housekeeper is a person employed to manage a household and the domestic staff. According to the 1861 Victorian era Mrs. Beeton's Book of Household Management, the housekeeper is second in command in the house and "except in large establishments, where there is a house steward, the housekeeper must consider his/herself as the immediate representative of her mistress".