C/2012 S1 (ISON)
메타데이터
| 항목 | 값 |
|---|---|
| Designation | C/2012 S1 (ISON) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2013-11-28T18:20:55.495680Z |
| Orbit solution date (soln_date, UTC) | 2025-11-21T13:42:48Z |
| Obs used | 6684 |
| NEO | - |
| M1 | 10.400 |
| K1 | 4.500 |
| PC | - |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2013-05-01.0000000 |
| e | 1.00000509 |
| q (au) | 0.012467 |
| a (au) | -2446.893404 |
| i (deg) | 62.162896 |
| Ω (om, deg) | 295.686541 |
| ω (w, deg) | 345.541197 |
| M (ma, deg) | -0.001724 |
밝기
산란 + 전체 선형
$$ M_a = (11.695 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 11.695 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.791 |
| k | 0.951 |
| δ90 | 10.000 |
| 파라미터 | 기호 | 범위 | 설명 |
|---|---|---|---|
| 태양·지구거리 1 AU에서의 절대등급 | H0 | -5 to 20 | 혜성의 고유 밝기 |
| 광도 기울기 파라미터 | n | 2 to 6 | 태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 | gf |
0.8 to 1 | 전방 산란의 강도 |
| 후방 산란 비대칭 계수 | gb |
-1 to -0.5 | 후방 산란의 강도 |
| 분할 계수 | k | 0.8 to 1 | 전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 | δ90 | 1 to 10 | 코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) | 끝 (UTC) | a | b |
|---|---|---|---|
| 2011-09-30 | 2013-11-13 | +0.7784 | -0.530 |
| 2013-11-13 | 2013-11-28 | +7.8926 | -0.124 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 07:17:07.44 | +37:28:43.0 | HIP 35225 | 14.32 |
| 2026-03-26 12:00 | 07:17:06.40 | +37:28:29.9 | HIP 35225 | 14.05 |
| 2026-03-27 00:00 | 07:17:05.39 | +37:28:16.6 | HIP 35225 | 13.79 |
| 2026-03-27 12:00 | 07:17:04.42 | +37:28:03.3 | HIP 35225 | 13.53 |
| 2026-03-28 00:00 | 07:17:03.50 | +37:27:49.9 | HIP 35225 | 13.27 |
| 2026-03-28 12:00 | 07:17:02.61 | +37:27:36.5 | HIP 35225 | 13.01 |
| 2026-03-29 00:00 | 07:17:01.77 | +37:27:22.9 | HIP 35225 | 12.76 |
| 2026-03-29 12:00 | 07:17:00.96 | +37:27:09.3 | HIP 35225 | 12.50 |
| 2026-03-30 00:00 | 07:17:00.20 | +37:26:55.6 | HIP 35225 | 12.25 |
| 2026-03-30 12:00 | 07:16:59.47 | +37:26:41.9 | HIP 35225 | 12.00 |
| 2026-03-31 00:00 | 07:16:58.79 | +37:26:28.1 | HIP 35225 | 11.75 |
| 2026-03-31 12:00 | 07:16:58.15 | +37:26:14.2 | HIP 35225 | 11.50 |
| 2026-04-01 00:00 | 07:16:57.55 | +37:26:00.2 | HIP 35225 | 11.25 |
| 2026-04-01 12:00 | 07:16:56.98 | +37:25:46.2 | HIP 35225 | 11.00 |
| 2026-04-02 00:00 | 07:16:56.46 | +37:25:32.1 | HIP 35225 | 10.76 |
| 2026-04-02 12:00 | 07:16:55.98 | +37:25:18.0 | HIP 35225 | 10.51 |
| 2026-04-03 00:00 | 07:16:55.54 | +37:25:03.7 | HIP 35225 | 10.26 |
| 2026-04-03 12:00 | 07:16:55.14 | +37:24:49.5 | HIP 35225 | 10.02 |
| 2026-04-04 00:00 | 07:16:54.78 | +37:24:35.1 | HIP 35225 | 9.77 |
| 2026-04-04 12:00 | 07:16:54.46 | +37:24:20.7 | HIP 35225 | 9.52 |
| 2026-04-05 00:00 | 07:16:54.17 | +37:24:06.3 | HIP 35225 | 9.28 |
| 2026-04-05 12:00 | 07:16:53.93 | +37:23:51.8 | HIP 35225 | 9.03 |
| 2026-04-06 00:00 | 07:16:53.73 | +37:23:37.2 | HIP 35225 | 8.79 |
| 2026-04-06 12:00 | 07:16:53.57 | +37:23:22.6 | HIP 35225 | 8.54 |
| 2026-04-07 00:00 | 07:16:53.45 | +37:23:07.9 | HIP 35225 | 8.30 |
| 2026-04-07 12:00 | 07:16:53.37 | +37:22:53.2 | HIP 35225 | 8.05 |
| 2026-04-08 00:00 | 07:16:53.33 | +37:22:38.4 | HIP 35225 | 7.80 |
| 2026-04-08 12:00 | 07:16:53.33 | +37:22:23.6 | HIP 35225 | 7.56 |
| 2026-04-09 00:00 | 07:16:53.37 | +37:22:08.7 | HIP 35225 | 7.31 |
| 2026-04-09 12:00 | 07:16:53.45 | +37:21:53.8 | HIP 35225 | 7.07 |
| 2026-04-10 00:00 | 07:16:53.57 | +37:21:38.8 | HIP 35225 | 6.82 |
| 2026-04-10 12:00 | 07:16:53.73 | +37:21:23.8 | HIP 35225 | 6.58 |
| 2026-04-11 00:00 | 07:16:53.93 | +37:21:08.7 | HIP 35225 | 6.34 |
| 2026-04-11 12:00 | 07:16:54.16 | +37:20:53.6 | HIP 35225 | 6.10 |
| 2026-04-12 00:00 | 07:16:54.44 | +37:20:38.4 | HIP 35225 | 5.86 |
| 2026-04-12 12:00 | 07:16:54.76 | +37:20:23.2 | HIP 35225 | 5.63 |
| 2026-04-13 00:00 | 07:16:55.12 | +37:20:08.0 | HIP 35225 | 5.39 |
| 2026-04-13 12:00 | 07:16:55.51 | +37:19:52.7 | HIP 35225 | 5.17 |
| 2026-04-14 00:00 | 07:16:55.95 | +37:19:37.4 | HIP 35225 | 4.94 |
| 2026-04-14 12:00 | 07:16:56.42 | +37:19:22.0 | HIP 35225 | 4.73 |
| 2026-04-15 00:00 | 07:16:56.94 | +37:19:06.6 | HIP 35225 | 4.52 |
| 2026-04-15 12:00 | 07:16:57.49 | +37:18:51.2 | HIP 35225 | 4.33 |
| 2026-04-16 00:00 | 07:16:58.08 | +37:18:35.7 | HIP 35225 | 4.14 |