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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 04:18:13.08 | -11:34:17.9 | HIP 20115 | 13.02 |
| 2026-07-29 12:00 | 04:18:14.35 | -11:34:32.6 | HIP 20115 | 12.63 |
| 2026-07-30 00:00 | 04:18:15.60 | -11:34:47.5 | HIP 20115 | 12.24 |
| 2026-07-30 12:00 | 04:18:16.84 | -11:35:02.5 | HIP 20115 | 11.86 |
| 2026-07-31 00:00 | 04:18:18.05 | -11:35:17.7 | HIP 20115 | 11.48 |
| 2026-07-31 12:00 | 04:18:19.24 | -11:35:32.9 | HIP 20115 | 11.09 |
| 2026-08-01 00:00 | 04:18:20.42 | -11:35:48.3 | HIP 20115 | 10.71 |
| 2026-08-01 12:00 | 04:18:21.58 | -11:36:03.8 | HIP 20115 | 10.34 |
| 2026-08-02 00:00 | 04:18:22.72 | -11:36:19.5 | HIP 20115 | 9.96 |
| 2026-08-02 12:00 | 04:18:23.84 | -11:36:35.3 | HIP 20115 | 9.58 |
| 2026-08-03 00:00 | 04:18:24.94 | -11:36:51.1 | HIP 20115 | 9.21 |
| 2026-08-03 12:00 | 04:18:26.02 | -11:37:07.2 | HIP 20115 | 8.84 |
| 2026-08-04 00:00 | 04:18:27.09 | -11:37:23.3 | HIP 20115 | 8.47 |
| 2026-08-04 12:00 | 04:18:28.13 | -11:37:39.5 | HIP 20115 | 8.10 |
| 2026-08-05 00:00 | 04:18:29.16 | -11:37:55.9 | HIP 20115 | 7.73 |
| 2026-08-05 12:00 | 04:18:30.16 | -11:38:12.4 | HIP 20115 | 7.36 |
| 2026-08-06 00:00 | 04:18:31.15 | -11:38:29.0 | HIP 20115 | 7.00 |
| 2026-08-06 12:00 | 04:18:32.12 | -11:38:45.7 | HIP 20115 | 6.63 |
| 2026-08-07 00:00 | 04:18:33.06 | -11:39:02.6 | HIP 20115 | 6.27 |
| 2026-08-07 12:00 | 04:18:33.99 | -11:39:19.5 | HIP 20115 | 5.91 |
| 2026-08-08 00:00 | 04:18:34.90 | -11:39:36.6 | HIP 20115 | 5.55 |
| 2026-08-08 12:00 | 04:18:35.79 | -11:39:53.8 | HIP 20115 | 5.19 |
| 2026-08-09 00:00 | 04:18:36.66 | -11:40:11.1 | HIP 20115 | 4.83 |
| 2026-08-09 12:00 | 04:18:37.50 | -11:40:28.5 | HIP 20115 | 4.48 |
| 2026-08-10 00:00 | 04:18:38.33 | -11:40:46.0 | HIP 20115 | 4.12 |
| 2026-08-10 12:00 | 04:18:39.14 | -11:41:03.6 | HIP 20115 | 3.77 |
| 2026-08-11 00:00 | 04:18:39.92 | -11:41:21.3 | HIP 20115 | 3.41 |
| 2026-08-11 12:00 | 04:18:40.69 | -11:41:39.1 | HIP 20115 | 3.06 |
| 2026-08-12 00:00 | 04:18:41.44 | -11:41:57.1 | HIP 20115 | 2.71 |
| 2026-08-12 12:00 | 04:18:42.16 | -11:42:15.1 | HIP 20115 | 2.36 |
| 2026-08-13 00:00 | 04:18:42.87 | -11:42:33.2 | HIP 20115 | 2.02 |
| 2026-08-13 12:00 | 04:18:43.55 | -11:42:51.5 | HIP 20115 | 1.67 |
| 2026-08-14 00:00 | 04:18:44.21 | -11:43:09.8 | HIP 20115 | 1.33 |
| 2026-08-14 12:00 | 04:18:44.86 | -11:43:28.2 | HIP 20115 | 0.99 |
| 2026-08-15 00:00 | 04:18:45.48 | -11:43:46.7 | HIP 20115 | 0.66 |
| 2026-08-15 12:00 | 04:18:46.08 | -11:44:05.3 | HIP 20115 | 0.37 |
| 2026-08-16 00:00 | 04:18:46.66 | -11:44:24.0 | HIP 20115 | 0.27 |
| 2026-08-16 12:00 | 04:18:47.22 | -11:44:42.8 | HIP 20115 | 0.50 |
| 2026-08-17 00:00 | 04:18:47.75 | -11:45:01.7 | HIP 20115 | 0.81 |
| 2026-08-17 12:00 | 04:18:48.27 | -11:45:20.7 | HIP 20115 | 1.14 |
| 2026-08-18 00:00 | 04:18:48.76 | -11:45:39.8 | HIP 20115 | 1.47 |
| 2026-08-18 12:00 | 04:18:49.24 | -11:45:58.9 | HIP 20115 | 1.81 |
| 2026-08-19 00:00 | 04:18:49.69 | -11:46:18.1 | HIP 20115 | 2.15 |