メタデータ
| 項目 |
値 |
| Designation |
C/2001 N2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-08-19T15:57:25.813440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:10Z |
| Obs used |
884 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2002-03-18.0000000 |
| e |
1.00105829 |
| q (au) |
2.668513 |
| a (au) |
-2521.533796 |
| i (deg) |
138.543532 |
| Ω (om, deg) |
52.803642 |
| ω (w, deg) |
151.896075 |
| M (ma, deg) |
-0.001204 |
等級
散乱 + 全体線形
$$
M_a = (10.423 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.423 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
| 2001-07-11 |
2002-03-19 |
+6.0608 |
-3.799 |
| 2002-03-19 |
2002-08-17 |
-14.8317 |
+6.318 |
| 2002-08-19 |
2003-06-08 |
+6.3253 |
-2.392 |
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) |
| 2026-09-20 00:00 |
06:43:28.46 |
-10:17:21.5 |
HIP 32088 |
22.40 |
| 2026-09-20 12:00 |
06:43:28.89 |
-10:17:42.3 |
HIP 32088 |
22.30 |
| 2026-09-21 00:00 |
06:43:29.30 |
-10:18:03.1 |
HIP 32088 |
22.19 |
| 2026-09-21 12:00 |
06:43:29.68 |
-10:18:23.9 |
HIP 32088 |
22.09 |
| 2026-09-22 00:00 |
06:43:30.05 |
-10:18:44.7 |
HIP 32088 |
21.99 |
| 2026-09-22 12:00 |
06:43:30.39 |
-10:19:05.6 |
HIP 32088 |
21.89 |
| 2026-09-23 00:00 |
06:43:30.70 |
-10:19:26.5 |
HIP 32088 |
21.79 |
| 2026-09-23 12:00 |
06:43:31.00 |
-10:19:47.4 |
HIP 32088 |
21.69 |
| 2026-09-24 00:00 |
06:43:31.27 |
-10:20:08.3 |
HIP 32088 |
21.59 |
| 2026-09-24 12:00 |
06:43:31.52 |
-10:20:29.2 |
HIP 32088 |
21.49 |
| 2026-09-25 00:00 |
06:43:31.75 |
-10:20:50.2 |
HIP 32088 |
21.39 |
| 2026-09-25 12:00 |
06:43:31.95 |
-10:21:11.2 |
HIP 32088 |
21.29 |
| 2026-09-26 00:00 |
06:43:32.14 |
-10:21:32.1 |
HIP 32088 |
21.19 |
| 2026-09-26 12:00 |
06:43:32.30 |
-10:21:53.1 |
HIP 32088 |
21.09 |
| 2026-09-27 00:00 |
06:43:32.43 |
-10:22:14.1 |
HIP 32088 |
20.99 |
| 2026-09-27 12:00 |
06:43:32.55 |
-10:22:35.1 |
HIP 32088 |
20.89 |
| 2026-09-28 00:00 |
06:43:32.64 |
-10:22:56.0 |
HIP 32088 |
20.79 |
| 2026-09-28 12:00 |
06:43:32.71 |
-10:23:17.0 |
HIP 32088 |
20.69 |
| 2026-09-29 00:00 |
06:43:32.75 |
-10:23:38.0 |
HIP 32088 |
20.59 |
| 2026-09-29 12:00 |
06:43:32.78 |
-10:23:59.0 |
HIP 32088 |
20.50 |
| 2026-09-30 00:00 |
06:43:32.78 |
-10:24:20.0 |
HIP 32088 |
20.40 |
| 2026-09-30 12:00 |
06:43:32.76 |
-10:24:41.0 |
HIP 32088 |
20.30 |
| 2026-10-01 00:00 |
06:43:32.71 |
-10:25:02.0 |
HIP 32088 |
20.20 |
| 2026-10-01 12:00 |
06:43:32.64 |
-10:25:23.0 |
HIP 32088 |
20.10 |
| 2026-10-02 00:00 |
06:43:32.55 |
-10:25:43.9 |
HIP 32088 |
20.01 |
| 2026-10-02 12:00 |
06:43:32.43 |
-10:26:04.9 |
HIP 32088 |
19.91 |
| 2026-10-03 00:00 |
06:43:32.29 |
-10:26:25.8 |
HIP 32088 |
19.81 |
| 2026-10-03 12:00 |
06:43:32.13 |
-10:26:46.7 |
HIP 32088 |
19.71 |
| 2026-10-04 00:00 |
06:43:31.95 |
-10:27:07.7 |
HIP 32088 |
19.62 |
| 2026-10-04 12:00 |
06:43:31.74 |
-10:27:28.6 |
HIP 32088 |
19.52 |
| 2026-10-05 00:00 |
06:43:31.51 |
-10:27:49.4 |
HIP 32088 |
19.42 |
| 2026-10-05 12:00 |
06:43:31.25 |
-10:28:10.3 |
HIP 32088 |
19.33 |
| 2026-10-06 00:00 |
06:43:30.98 |
-10:28:31.1 |
HIP 32088 |
19.23 |
| 2026-10-06 12:00 |
06:43:30.68 |
-10:28:52.0 |
HIP 32088 |
19.14 |
| 2026-10-07 00:00 |
06:43:30.35 |
-10:29:12.7 |
HIP 32088 |
19.04 |
| 2026-10-07 12:00 |
06:43:30.00 |
-10:29:33.5 |
HIP 32088 |
18.95 |
| 2026-10-08 00:00 |
06:43:29.63 |
-10:29:54.2 |
HIP 32088 |
18.85 |
| 2026-10-08 12:00 |
06:43:29.24 |
-10:30:14.9 |
HIP 32088 |
18.76 |
| 2026-10-09 00:00 |
06:43:28.82 |
-10:30:35.6 |
HIP 32088 |
18.66 |
| 2026-10-09 12:00 |
06:43:28.38 |
-10:30:56.3 |
HIP 32088 |
18.57 |
| 2026-10-10 00:00 |
06:43:27.91 |
-10:31:16.9 |
HIP 32088 |
18.48 |
| 2026-10-10 12:00 |
06:43:27.42 |
-10:31:37.4 |
HIP 32131 |
18.21 |
| 2026-10-11 00:00 |
06:43:26.91 |
-10:31:57.9 |
HIP 32131 |
17.87 |