En el presente trabajo mediante fotometría se obtuvo las curva de los cometas C/2002 T7 LINEAR y C/2001 Q4 NEAT y con base a ellas los respectivos índices cometarios y magnitudes absolutas para los astros citados. Para el primer cometa (cuando se acercaba al sol) el índice se calculó en 4 y su magnitud absoluta en 4.3. Para el segundo cometa, el índice se estimó en 8.4 y su magnitud absoluta en 6.2. Fue difícil predecir los parámetros correspondientes al cometa NEAT porque sólo se contó con 11 días entre la primera observación y el máximo acercamiento a la Tierra. Con la determinación de la magnitud absoluta y mediante la relación de David Hughes se estimó el radio del núcleo del cometa C/2002 T7 LINEAR en aproximadamente 2.7 kilómetros y su masa en 4.3x10 13 kilogramos . Mediante estudio espectrométrico de la coma del cometa C/2001 Q4 NEAT se detectó claramente la presencia de las bandas correspondientes a : C 2 ( D n = -1) , C 2 ( D n = 0), C 2 ( Dn = 1) y CN. No se detectaron las bandas de C 3 y la de C 2 ( D n = 2), bandas que otros autores observaron en el cometa Hale-Bopp.

Palabras Claves: Cometas, fotometría, espectrometría, curva luminosa

In this work the luminous curves of the comets C/2002 T7 LINEAR and C/2001 Q4 NEAT were obtained by using photometry, and at the time and based on this, were obtained the corresponding cometary indexes and absolute magnitudes for the mentioned celestial bodies. For the first comet (when it approached the sun) the index was calculated to be 4 and its absolute magnitude was 4.3. For the second comet, the index was estimated at 8.4 and its absolute magnitude at 6.2. It was hard to predict the corresponding parameters to the comet NEAT because there were only 11 days between the first observation and the highest approach to Earth. With the establishment of the ab-solute magnitude and through the David Hughes relation the C/2002 T7 LINEAR comet’s radius was estimated at about 2.7 kilometers and its mass at 4.3x10 13 kilograms. By means of spectrome-tric study of the C/2001 Q4 NEAT comet’s coma, it we clearly detected the presence of the bands corresponding to: C2 ( = -1), C2 ( = 0), C2 ( = 1), and CN. The bands of C3 and that of C2 ( = 2) were not detected, although those were observed by other authors in the Hale-Bopp co-met.

keywords: Comets, photometry, espectrometry, luminous curves