It then travels northward to its northern terminus at NM 130.

[1] It takes its number from the wavelength of the Hydrogen-alpha spectral line (6563 Å) used by scientists at the observatory to study the solar chromosphere and to locate solar flares on the Sun.

[4] The solar observatory added signs along the highway in 2011 with the names of the planets as part of a 1:250 million model of the distances between planets in the Solar System.

[5] The highway was designated a National Forest scenic byway on October 6, 1990.

[6] The entire route is in Otero County.