C/2002 V1 (NEAT)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2002 V1 (NEAT) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2003-02-18T07:05:52.609920Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:30:22Z |
| Obs used | 1510 |
| NEO | - |
| M1 | 10.400 |
| K1 | 14.250 |
| PC | 0.030 |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2002-12-26.0000000 |
| e | 0.99990177 |
| q (au) | 0.099258 |
| a (au) | 1010.516972 |
| i (deg) | 81.706057 |
| Ω (om, deg) | 64.088430 |
| ω (w, deg) | 152.169686 |
| M (ma, deg) | 359.998334 |
等級
散乱 + 全体線形
$$ M_a = (8.600 + 5.819\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 8.600 |
| n | 5.819 |
| gf | 0.800 |
| gb | -0.500 |
| k | 1.000 |
| δ90 | 10.000 |
| パラメータ | 記号 | 範囲 | 説明 |
|---|---|---|---|
| 太陽・地球距離が1 AUのときの絶対等級 | H0 | -5 to 20 | 彗星の固有の明るさ |
| 測光スロープパラメータ | n | 2 to 6 | 太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 | gf |
0.8 to 1 | 前方散乱の強さ |
| 後方散乱非対称係数 | gb |
-1 to -0.5 | 後方散乱の強さ |
| 分配係数 | k | 0.8 to 1 | 前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 | δ90 | 1 to 10 | ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) | 終了日 (UTC) | a | b |
|---|---|---|---|
| 2002-11-06 | 2003-01-09 | +8.2413 | -1.967 |
| 2003-01-09 | 2003-02-16 | -4.0417 | -0.415 |
| 2003-02-18 | 2003-03-14 | -5.0184 | -2.415 |
| 2003-03-14 | 2003-10-22 | +0.7169 | -2.971 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 04:14:14.52 | -11:23:33.1 | HIP 19678 | 25.08 |
| 2026-06-01 12:00 | 04:14:17.04 | -11:23:28.8 | HIP 19678 | 25.51 |
| 2026-06-02 00:00 | 04:14:19.55 | -11:23:24.7 | HIP 19678 | 25.95 |
| 2026-06-02 12:00 | 04:14:22.06 | -11:23:20.7 | HIP 19678 | 26.39 |
| 2026-06-03 00:00 | 04:14:24.57 | -11:23:16.9 | HIP 19678 | 26.85 |
| 2026-06-03 12:00 | 04:14:27.07 | -11:23:13.3 | HIP 19678 | 27.31 |
| 2026-06-04 00:00 | 04:14:29.57 | -11:23:09.8 | HIP 19678 | 27.78 |
| 2026-06-04 12:00 | 04:14:32.07 | -11:23:06.6 | HIP 19678 | 28.26 |
| 2026-06-05 00:00 | 04:14:34.57 | -11:23:03.5 | HIP 19678 | 28.74 |
| 2026-06-05 12:00 | 04:14:37.06 | -11:23:00.5 | HIP 19678 | 29.23 |
| 2026-06-06 00:00 | 04:14:39.55 | -11:22:57.8 | HIP 19678 | 29.72 |
| 2026-06-06 12:00 | 04:14:42.04 | -11:22:55.2 | HIP 19678 | 30.22 |
| 2026-06-07 00:00 | 04:14:44.52 | -11:22:52.8 | HIP 19678 | 30.72 |
| 2026-06-07 12:00 | 04:14:47.00 | -11:22:50.6 | HIP 19678 | 31.23 |
| 2026-06-08 00:00 | 04:14:49.48 | -11:22:48.6 | HIP 19678 | 31.74 |
| 2026-06-08 12:00 | 04:14:51.95 | -11:22:46.7 | HIP 19678 | 32.26 |
| 2026-06-09 00:00 | 04:14:54.42 | -11:22:45.0 | HIP 19678 | 32.78 |
| 2026-06-09 12:00 | 04:14:56.88 | -11:22:43.5 | HIP 19678 | 33.30 |
| 2026-06-10 00:00 | 04:14:59.34 | -11:22:42.1 | HIP 19678 | 33.83 |
| 2026-06-10 12:00 | 04:15:01.79 | -11:22:41.0 | HIP 19678 | 34.36 |
| 2026-06-11 00:00 | 04:15:04.24 | -11:22:40.0 | HIP 19678 | 34.89 |
| 2026-06-11 12:00 | 04:15:06.68 | -11:22:39.2 | HIP 19678 | 35.42 |
| 2026-06-12 00:00 | 04:15:09.12 | -11:22:38.6 | HIP 19678 | 35.96 |
| 2026-06-12 12:00 | 04:15:11.56 | -11:22:38.1 | HIP 19678 | 36.50 |
| 2026-06-13 00:00 | 04:15:13.98 | -11:22:37.9 | HIP 19678 | 37.04 |
| 2026-06-13 12:00 | 04:15:16.41 | -11:22:37.8 | HIP 19678 | 37.58 |
| 2026-06-14 00:00 | 04:15:18.82 | -11:22:37.9 | HIP 19678 | 38.12 |
| 2026-06-14 12:00 | 04:15:21.23 | -11:22:38.1 | HIP 19678 | 38.67 |
| 2026-06-15 00:00 | 04:15:23.64 | -11:22:38.6 | HIP 19678 | 39.21 |
| 2026-06-15 12:00 | 04:15:26.03 | -11:22:39.2 | HIP 19678 | 39.76 |
| 2026-06-16 00:00 | 04:15:28.42 | -11:22:40.0 | HIP 19678 | 40.30 |
| 2026-06-16 12:00 | 04:15:30.81 | -11:22:41.0 | HIP 19678 | 40.85 |
| 2026-06-17 00:00 | 04:15:33.18 | -11:22:42.1 | HIP 19678 | 41.40 |
| 2026-06-17 12:00 | 04:15:35.55 | -11:22:43.4 | HIP 19678 | 41.95 |
| 2026-06-18 00:00 | 04:15:37.92 | -11:22:45.0 | HIP 19678 | 42.50 |
| 2026-06-18 12:00 | 04:15:40.27 | -11:22:46.6 | HIP 19678 | 43.05 |
| 2026-06-19 00:00 | 04:15:42.62 | -11:22:48.5 | HIP 19678 | 43.59 |
| 2026-06-19 12:00 | 04:15:44.96 | -11:22:50.6 | HIP 19678 | 44.14 |
| 2026-06-20 00:00 | 04:15:47.29 | -11:22:52.8 | HIP 19678 | 44.69 |
| 2026-06-20 12:00 | 04:15:49.61 | -11:22:55.2 | HIP 19678 | 45.24 |
| 2026-06-21 00:00 | 04:15:51.93 | -11:22:57.7 | HIP 19678 | 45.79 |
| 2026-06-21 12:00 | 04:15:54.23 | -11:23:00.5 | HIP 19678 | 46.34 |
| 2026-06-22 00:00 | 04:15:56.53 | -11:23:03.4 | HIP 19678 | 46.88 |