View Full Version : Hubble's constraints

2003-Jun-20, 11:02 AM
Within how many degrees of the sun is Hubble not to be used, and how many degrees was Venus from the sun the one time this regulation was bent?

2003-Jun-20, 02:44 PM
According to this (http://www.pbs.org/deepspace/hubble/diagram.html), the limit is 50 degrees. But it says:

"Objects in the inner solar system, such as Venus or comets near perihelion, are unfortunately difficult or impossible to observe with HST, because of the 50 degree solar limit. When the scientific justification is compelling, observations of Venus and time-critical observations of other solar-system objects lying between 45 degrees and 50 degrees of the Sun may be carried out."

2003-Jun-21, 02:09 AM

I was just wondering if it was close enough that the rules could be bent to observe Mercury, but the answer is emphatically no. At aphelion, Mercury is about 28 degrees from the sun. I was hoping the Hubble threshold was more like 30 instead of 50.