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 | +8.2411 | -1.967 |
| 2003-01-09 | 2003-02-16 | -4.0411 | -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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 04:09:06.64 | -12:32:33.6 | HIP 19438 | 9.44 |
| 2026-02-03 12:00 | 04:09:05.70 | -12:32:14.6 | HIP 19438 | 9.71 |
| 2026-02-04 00:00 | 04:09:04.79 | -12:31:55.6 | HIP 19438 | 9.98 |
| 2026-02-04 12:00 | 04:09:03.90 | -12:31:36.4 | HIP 19438 | 10.25 |
| 2026-02-05 00:00 | 04:09:03.02 | -12:31:17.1 | HIP 19438 | 10.53 |
| 2026-02-05 12:00 | 04:09:02.18 | -12:30:57.8 | HIP 19438 | 10.80 |
| 2026-02-06 00:00 | 04:09:01.35 | -12:30:38.3 | HIP 19438 | 11.08 |
| 2026-02-06 12:00 | 04:09:00.55 | -12:30:18.7 | HIP 19438 | 11.36 |
| 2026-02-07 00:00 | 04:08:59.77 | -12:29:59.0 | HIP 19438 | 11.65 |
| 2026-02-07 12:00 | 04:08:59.01 | -12:29:39.2 | HIP 19438 | 11.93 |
| 2026-02-08 00:00 | 04:08:58.27 | -12:29:19.4 | HIP 19438 | 12.21 |
| 2026-02-08 12:00 | 04:08:57.56 | -12:28:59.4 | HIP 19438 | 12.49 |
| 2026-02-09 00:00 | 04:08:56.87 | -12:28:39.3 | HIP 19438 | 12.78 |
| 2026-02-09 12:00 | 04:08:56.20 | -12:28:19.2 | HIP 19438 | 13.06 |
| 2026-02-10 00:00 | 04:08:55.56 | -12:27:58.9 | HIP 19438 | 13.34 |
| 2026-02-10 12:00 | 04:08:54.94 | -12:27:38.6 | HIP 19438 | 13.63 |
| 2026-02-11 00:00 | 04:08:54.34 | -12:27:18.2 | HIP 19438 | 13.91 |
| 2026-02-11 12:00 | 04:08:53.77 | -12:26:57.7 | HIP 19438 | 14.19 |
| 2026-02-12 00:00 | 04:08:53.21 | -12:26:37.1 | HIP 19438 | 14.48 |
| 2026-02-12 12:00 | 04:08:52.68 | -12:26:16.4 | HIP 19438 | 14.76 |
| 2026-02-13 00:00 | 04:08:52.18 | -12:25:55.6 | HIP 19438 | 15.04 |
| 2026-02-13 12:00 | 04:08:51.70 | -12:25:34.8 | HIP 19438 | 15.32 |
| 2026-02-14 00:00 | 04:08:51.24 | -12:25:13.9 | HIP 19438 | 15.60 |
| 2026-02-14 12:00 | 04:08:50.80 | -12:24:52.9 | HIP 19438 | 15.88 |
| 2026-02-15 00:00 | 04:08:50.39 | -12:24:31.8 | HIP 19438 | 16.16 |
| 2026-02-15 12:00 | 04:08:50.00 | -12:24:10.7 | HIP 19438 | 16.44 |
| 2026-02-16 00:00 | 04:08:49.63 | -12:23:49.5 | HIP 19438 | 16.72 |
| 2026-02-16 12:00 | 04:08:49.29 | -12:23:28.2 | HIP 19438 | 17.00 |
| 2026-02-17 00:00 | 04:08:48.97 | -12:23:06.8 | HIP 19438 | 17.28 |
| 2026-02-17 12:00 | 04:08:48.67 | -12:22:45.4 | HIP 19290 | 17.15 |
| 2026-02-18 00:00 | 04:08:48.40 | -12:22:23.9 | HIP 19290 | 16.82 |
| 2026-02-18 12:00 | 04:08:48.15 | -12:22:02.4 | HIP 19290 | 16.50 |
| 2026-02-19 00:00 | 04:08:47.93 | -12:21:40.8 | HIP 19290 | 16.19 |
| 2026-02-19 12:00 | 04:08:47.72 | -12:21:19.1 | HIP 19290 | 15.88 |
| 2026-02-20 00:00 | 04:08:47.54 | -12:20:57.4 | HIP 19290 | 15.57 |
| 2026-02-20 12:00 | 04:08:47.39 | -12:20:35.6 | HIP 19290 | 15.27 |
| 2026-02-21 00:00 | 04:08:47.25 | -12:20:13.8 | HIP 19290 | 14.98 |
| 2026-02-21 12:00 | 04:08:47.14 | -12:19:51.9 | HIP 19290 | 14.69 |
| 2026-02-22 00:00 | 04:08:47.06 | -12:19:30.0 | HIP 19290 | 14.41 |
| 2026-02-22 12:00 | 04:08:46.99 | -12:19:08.0 | HIP 19290 | 14.14 |
| 2026-02-23 00:00 | 04:08:46.95 | -12:18:46.0 | HIP 19290 | 13.88 |
| 2026-02-23 12:00 | 04:08:46.93 | -12:18:24.0 | HIP 19290 | 13.62 |
| 2026-02-24 00:00 | 04:08:46.94 | -12:18:01.9 | HIP 19290 | 13.37 |