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Reporte Nº 8 REA/BRASIL REDE DE ASTRONOMIA OBSERVACIONAL BRASIL REPORTE Nº 8 OUTUBRO , 1997 REA/Brasil - REPORTE Nº 8 1 EDITORIAL EXPEDIENTE O Reporte nº 8 é uma publicação da REA/Brasil A presente edição do tradicional - Rede de Astronomia Observacional - Brasil, entidade "Reporte" ocorre quando algumas mudanças amadora de ämbito nacional, com sede em São Paulo, Caixa Postal 310, CEP 01050-970 - São Paulo - SP. fundamentais tëm ocorrido em nossa Rede: a mudança Os Reportes são distribuídos aos associados da de nosso nome - de REA para REA/Brasil, para REA/Brasil e a diversas entidades astronömicas caracterizar uma associação de ämbito realmente amadoras e profissionais, no Brasil e países latino- nacional; a proximidade do décimo aniversário de nossa americanos. associação, com mais de vinte mil observações A REA/Brasil é extruturada setorialmente, sendo os seguintes diretores de cada seção observacional: realizadas por nossos observadores e registradas no Estrelas Variáveis: Antonio Padilla Filho (Rio de Banco de Dados; a reestruturação organizacional Janeiro-RJ) recentemente realizada, possibilitando uma Planetas Inferiores: Cláudio Brasil Leitão Jr. (São comunicação mais ágil entre todos os membros; o Paulo - SP) redesenho de nosso Banco de Dados para uma versão Marte: Nelson Falsarella (São José do Rio Preto - SP) Planetas Jovianos: Frederico Luiz Funari (São Paulo mais amigável e acessível a todos;e o uso definitivo - SP) dos meios eletrönicos de comunicação - correio Lunar: Walter José Maluf (Monte Mor - SP) eletrönico e particularmente a Internet, onde a REA/ Cometas: Tasso Augusto Napoleão (São Paulo - SP) Brasil dispõe de um "site" dinämico e atraente para Meteoros: João Ricardo Oliveira Santos (Campinas - todos aqueles interessados em Astronomia amadora SP) Eclipses: Hélio de Carvalho Vital (Rio de Janeiro - RJ) (http://www.geocities.com/CapeCanaveral/9355). Ocultações: Romualdo Lourençon (Jundiaí - SP) Como de hábito, os textos que Objetos de Fundo de Céu: Marilena Mollaco (São compõem a presente edição foram elaborados pelos Paulo - SP) associados da REA/Brasil e cobrem uma gama Solar: Paulo Roberto Moser (São Paulo - SP) diversificada de assuntos e áreas de interesse Asteróides: Antonio Carlos Coelho (Brasília - DF) Radioastronomia: Marco Aurélio Minozzo (São Paulo astronömico, sempre no campo observacional: estrelas - SP) variáveis, eclipses, cometas, planetas (Venus, Marte, Astrofotografia: Marco Antonio de Bellis (Rio de Janeiro Júpiter), fotometria e astrofotografia - além do inusitado - RJ) choque de fragmentos do Cometa Shoemaker-Levy 9 CCD e Tratamento de Imagens: Carlos Alberto com o planeta Júpiter em 1994. Colesanti (São Paulo - SP) A todos os que nos tëm acompanhado O núcleo operacional de São Paulo conta com as nestes quase dez anos de existëncia, desejamos uma seguintes coordenações editoriais/administrativas: agradável leitura. Como sempre, suas críticas, sugestões Diretor de Operações: Carlos Alberto Colesanti e comentários sobre a presente edição serão bem Diretor Administrativo/Financeiro: Claudio D. vindas e servirão para aperfeiçoarmos cada vez mais Carboni Diretor de Sistemas: Edvaldo José Trevisan nossas publicações no futuro. Diretor de Análise e Redução de Dados: Frederico Boas observações! Luiz Funari Diretor Secretário: Marilena O. Mollaco Diretor de Sistemas: Marco Aurélio Minozzo Diretor Secretário: Paulo Roberto Moser Diretor de Análise e Redução de Dados: Tasso Augusto Napoleão Foto da capa: Objeto: Lua e Cometa Hale-Bopp Distäncia focal= 135mm, f/4 Tempo: 30 segundos Início: 08/5/97 - 21h10 TU Centro em: Ascensão reta 4h56m Declinação: 19º28" (2000.0) Guiagem Manual Local: Venda Nova - RJ Filme: Kodak EKTAPRESS MULTISPEED PJN Revelação: C41 - ISO 640 Autor: Marco Antonio de Bellis Estrela mais brilhante do campo (embaixo esquerda): Aldebaran REA/Brasil - REPORTE Nº 8 2 O Efeito Schroter em Vênus nas Elongações Vespertina de 1994 e Matutina de 1995 Claudio Brasil Leitão Junior (REA/Brasil - São Paulo) Abstract. The Schroter effect in Venus during the evening elongation in 1994 and morning elongation in 1995 (C.B.Leitão JR.). Since the very beginning of REA's activities in 1988, an observational program for the study of the Schroter effect in Venus has been carried out. Over those years, hundreds of observations have been collected. The elongations described in this article are the ninth and tenth studied by REA/Brasil. Introdução. Desde o início das atividades da REA/ Brasil em 1988, mantëm-se um projeto observacional para o estudo do Efeito Schröter em Vênus /1/. Ao longo desses anos, centenas de observações foram coletadas através de observadores assíduos e ocasionais. As elongações abordadas nesse artigo são a nona e a décima estudadas pela REA/Brasil. 1. Elongação Vespertina de 1994. FIGURA 1 Assim como na elongação vespertina de 1993, colheu-se na elongação vespertina de 1994 um Nr. de bom número de observações. Obteve-se 83 observações Observador Instrumento realizadas por 7 observadores, sendo que 73 observações Observações foram utilizadas para a análise do Efeito Schröter. A6-ndré L. da Silva - A análise por regressão linear forneceu Antonio Rosa 1m8 Refl. 180 m um coeficiente de correlação de 0.90462, indicando uma Campos boa coerëncia de dados apesar do grande número de Edvaldo J. Catad. 114mm 15 observações. A equação da reta de regressão linear é: Trevisan F=1000mm João B. França Refl. 150 mm 1 F = 0.48506 - 0.00552 x DJ' (1) Nunes F=1050mm Marcelo D. A. 1m7 Refl. 114m onde DJ' = dia juliano - dia juliano da data teórica Nunes R8enato Levai Refl. 114mm f/ 8 Fazendo-se F = 0.5 na equação 1, Maksutov obtem-se DJ' = - 2.71. Portanto, conclui-se que a W8alter Maluf 1 150mm/Cass. dicotomia citeriana ocorreu 2.71 dias antes da data 500mm teórica, sendo a menor discrepäncia encontrada pela REA/Brasil até agora. A figura 1 apresenta o gráfico Fase observada versus Diferença entre a data da Tabela I dicotomia observada e a data da dicotomia teórica. Relação dos Observadores REA/Brasil - REPORTE Nº 8 3 A figura 2a apresenta um esboço feito por Antonio Rosa Campos com um telescópio newtoniano Figura 3 de 180 mm e 100 aumentos, no dia 28/7 às 21:20 TU. A figura 2b é um esboço realizado por Walter Maluf em 31/08 às 21:24 TU com um Maksutov de 150 mm de abertura e 141 aumentos. Notem o terminador praticamente retilíneo e as pequenas cúspides, detalhes que mostram ao observador que o planeta está muito próximo da dicotomia. Figura 2a Figura 2b A figura 4a apresenta um esboço de 2. Elongação Matutina de 1995. Vênus realizado por Renato Levai no dia 17/1/95 às 13:40 Tivemos nessa elongação um total 15 TU com um refletor 114 mm. Importante notar as observações realizadas por 3 observadores. irregularidades no terminador. A figura 4b é um esboço A análise por regressão linear forneceu de Frederico L. Funari realizado em 17/2/95 com um um coeficiente de correlação linear de 0.95441, indicando Cassegrain de 185 mm que mostra duas regiões brilhantes um ótimo ajuste e baixa dispersão dos dados. A equação próximo às extremidades do terminador. Uma outra da reta de regressão linear é: estrutura atmosférica também é visível. Figura 4a Figura 4b F = 0.47378 + 0.00385 x DJ' (2) onde DJ' = dia juliano - dia juliano da data teórica Fazendo-se F = 0.5 na equação 2, obtém-se DJ' = + 6.81, ou seja, a dicotomia ocorreu 6.81 dias depois da data teórica, uma discrepäncia bastante alta, mais ainda bem inferior ao recorde obtido pela REA/ Brasil em 1990, que foi de 14.19 dias. Nota-se também que esta discrepäncia praticamente cobrou em relação 3. Quadro - Resumo das Elongações. à última elongação matutina, ocorrida em 1993. A figura 3 apresenta o gráfico Fase observada versus 4. Agradecimentos. Diferença entre a data da dicotomia observada e a Evlong. N/. Obser D.ic.Teor./2 D.ic.Observ Discrep data da dicotomia teórica. 18988V 3858,22Abr8 13,19Abr8 -4,0 Tabela II - Relação de Observadores 10988M 28282,11Ago8 341,05Ago8 8,9 16989V 5979,76Nov8 39,86Nov8 -3, Nr. de 16990M 301,15Mar9 0194,34Abr9 14,1 Observador Instrumento Observações 14991V 112 113,19Jun9 62,07Jun9 -7,1 Cláudio Brasil L. Cass. 180mm 8 19991M 2111,41Nov9 73,14Nov9 5,7 Jr. f/15 14993V 130 231,94Jan9 194,75Jan9 -7,1 Frederico L. 2mCass. 185 m Funari 13993M 13131,30Jun9 185,28Jun9 3,9 13994V 84242,47Ago9 119,76Ago9 -2,7 Edvaldo José Catad. 114mm 5 Trevisan F = 1000mm 15995M 15153,22Jan9 210,03Jan9 6,8 REA/Brasil - REPORTE Nº 8 4 Agradeço a todos os observadores de Vênus pela persistëncia e constäncia, sem os quais esse Endereço do autor: trabalho não teria sido possível. Cláudio Brasil Leitão Júnio R. Prof. Júlio do Amaral Carvalho, 201 5. Referências. 05547-000 - São Paulo - SP /1/. Leitão Jr., Cláudio Brasil - "O Efeito BRAZIL Schroter em Vênus na Elongação Vespertina de 1988", Internet: [email protected] REA, nr. 1, pp 3-10, 1988. /2/ Meeus, J. - "Theoretical Dichotomy of Venus, 1960-2000", JBAA, 90, pp 442-443, 1980. REA/Brasil - REPORTE Nº 8 5 Eclipse Lunar Parcial de 24-25 de Maio de 1994 Helio C. Vital (REA/Brasil-RJ) Abstract. Antonio Rosa Campos (ARC) & João Batista França Nunes In the evening of may 24-25, 1994, the Francisco Saulo Bezerra de Arruda (FBA) southern region of the moon crossed the extreme north Helio de Carvalho Vital (HCV) of the Earth's shadow. The observation of this Marcos Jeronimo Roque Barreto (MRB) phenomenon, as proposed in REA's Observational & Boisbaudran O. Imperiano Project 194/94, was very worthwhite, despite the small Renato Levai (RL) magnitude of this eclipse (0.25). 1. Introdução. Os instantes cronometrados para os contatos da umbra com o limbo lunar ou com os centros Na Noite de 24-25 de maio de 1994, o das duas crateras estão listados na tabela 2 em Tempo extremo sul da Lua atravessou o extremo norte da umbra Universal Coordenado (TUC).
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