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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 04:09:27.65 | -11:55:39.4 | HIP 19409 | 3.99 |
| 2026-03-26 12:00 | 04:09:28.95 | -11:55:17.7 | HIP 19409 | 4.38 |
| 2026-03-27 00:00 | 04:09:30.28 | -11:54:56.2 | HIP 19409 | 4.80 |
| 2026-03-27 12:00 | 04:09:31.63 | -11:54:34.6 | HIP 19409 | 5.22 |
| 2026-03-28 00:00 | 04:09:32.99 | -11:54:13.2 | HIP 19409 | 5.65 |
| 2026-03-28 12:00 | 04:09:34.37 | -11:53:51.8 | HIP 19409 | 6.10 |
| 2026-03-29 00:00 | 04:09:35.77 | -11:53:30.5 | HIP 19409 | 6.55 |
| 2026-03-29 12:00 | 04:09:37.19 | -11:53:09.2 | HIP 19409 | 7.01 |
| 2026-03-30 00:00 | 04:09:38.62 | -11:52:48.0 | HIP 19409 | 7.47 |
| 2026-03-30 12:00 | 04:09:40.08 | -11:52:26.9 | HIP 19409 | 7.94 |
| 2026-03-31 00:00 | 04:09:41.55 | -11:52:05.8 | HIP 19409 | 8.41 |
| 2026-03-31 12:00 | 04:09:43.03 | -11:51:44.9 | HIP 19409 | 8.89 |
| 2026-04-01 00:00 | 04:09:44.54 | -11:51:23.9 | HIP 19409 | 9.37 |
| 2026-04-01 12:00 | 04:09:46.06 | -11:51:03.1 | HIP 19409 | 9.85 |
| 2026-04-02 00:00 | 04:09:47.60 | -11:50:42.3 | HIP 19409 | 10.34 |
| 2026-04-02 12:00 | 04:09:49.16 | -11:50:21.6 | HIP 19409 | 10.83 |
| 2026-04-03 00:00 | 04:09:50.73 | -11:50:01.0 | HIP 19409 | 11.33 |
| 2026-04-03 12:00 | 04:09:52.33 | -11:49:40.4 | HIP 19409 | 11.82 |
| 2026-04-04 00:00 | 04:09:53.93 | -11:49:20.0 | HIP 19409 | 12.32 |
| 2026-04-04 12:00 | 04:09:55.56 | -11:48:59.6 | HIP 19409 | 12.83 |
| 2026-04-05 00:00 | 04:09:57.20 | -11:48:39.3 | HIP 19409 | 13.33 |
| 2026-04-05 12:00 | 04:09:58.85 | -11:48:19.1 | HIP 19409 | 13.84 |
| 2026-04-06 00:00 | 04:10:00.53 | -11:47:58.9 | HIP 19409 | 14.35 |
| 2026-04-06 12:00 | 04:10:02.22 | -11:47:38.9 | HIP 19409 | 14.87 |
| 2026-04-07 00:00 | 04:10:03.92 | -11:47:18.9 | HIP 19409 | 15.38 |
| 2026-04-07 12:00 | 04:10:05.64 | -11:46:59.0 | HIP 19409 | 15.90 |
| 2026-04-08 00:00 | 04:10:07.38 | -11:46:39.2 | HIP 19409 | 16.42 |
| 2026-04-08 12:00 | 04:10:09.13 | -11:46:19.5 | HIP 19409 | 16.94 |
| 2026-04-09 00:00 | 04:10:10.90 | -11:45:59.9 | HIP 19409 | 17.47 |
| 2026-04-09 12:00 | 04:10:12.68 | -11:45:40.4 | HIP 19409 | 18.00 |
| 2026-04-10 00:00 | 04:10:14.48 | -11:45:20.9 | HIP 19409 | 18.53 |
| 2026-04-10 12:00 | 04:10:16.29 | -11:45:01.6 | HIP 19409 | 19.06 |
| 2026-04-11 00:00 | 04:10:18.12 | -11:44:42.4 | HIP 19409 | 19.59 |
| 2026-04-11 12:00 | 04:10:19.96 | -11:44:23.2 | HIP 19409 | 20.13 |
| 2026-04-12 00:00 | 04:10:21.82 | -11:44:04.2 | HIP 19409 | 20.66 |
| 2026-04-12 12:00 | 04:10:23.69 | -11:43:45.2 | HIP 19409 | 21.20 |
| 2026-04-13 00:00 | 04:10:25.58 | -11:43:26.4 | HIP 19409 | 21.74 |
| 2026-04-13 12:00 | 04:10:27.48 | -11:43:07.7 | HIP 19409 | 22.29 |
| 2026-04-14 00:00 | 04:10:29.40 | -11:42:49.0 | HIP 19409 | 22.83 |
| 2026-04-14 12:00 | 04:10:31.32 | -11:42:30.5 | HIP 19506 | 22.84 |
| 2026-04-15 00:00 | 04:10:33.27 | -11:42:12.1 | HIP 19506 | 22.48 |
| 2026-04-15 12:00 | 04:10:35.22 | -11:41:53.8 | HIP 19506 | 22.12 |
| 2026-04-16 00:00 | 04:10:37.19 | -11:41:35.5 | HIP 19506 | 21.77 |