メタデータ
| 項目 |
値 |
| Designation |
C/2002 E2 (Snyder-Murakami) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-02-21T19:01:43.622400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:15Z |
| Obs used |
905 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
7.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2002-05-22.0000000 |
| e |
1.00078903 |
| q (au) |
1.466445 |
| a (au) |
-1858.536843 |
| i (deg) |
92.544982 |
| Ω (om, deg) |
244.582842 |
| ω (w, deg) |
9.034141 |
| M (ma, deg) |
0.001097 |
等級
散乱 + 全体線形
$$
M_a = (8.648 + 4.589\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.648 |
| n |
4.589 |
| gf |
0.980 |
| gb |
-1.000 |
| k |
0.992 |
| δ90 |
9.688 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
04:08:11.80 |
+32:48:11.5 |
HIP 19240 |
19.76 |
| 2026-09-20 12:00 |
04:08:10.59 |
+32:48:14.5 |
HIP 19240 |
19.59 |
| 2026-09-21 00:00 |
04:08:09.36 |
+32:48:17.3 |
HIP 19240 |
19.42 |
| 2026-09-21 12:00 |
04:08:08.10 |
+32:48:20.1 |
HIP 19240 |
19.25 |
| 2026-09-22 00:00 |
04:08:06.82 |
+32:48:22.8 |
HIP 19240 |
19.09 |
| 2026-09-22 12:00 |
04:08:05.52 |
+32:48:25.4 |
HIP 19240 |
18.92 |
| 2026-09-23 00:00 |
04:08:04.19 |
+32:48:27.9 |
HIP 19240 |
18.76 |
| 2026-09-23 12:00 |
04:08:02.84 |
+32:48:30.4 |
HIP 19240 |
18.60 |
| 2026-09-24 00:00 |
04:08:01.47 |
+32:48:32.7 |
HIP 19240 |
18.44 |
| 2026-09-24 12:00 |
04:08:00.07 |
+32:48:35.0 |
HIP 19240 |
18.29 |
| 2026-09-25 00:00 |
04:07:58.65 |
+32:48:37.2 |
HIP 19240 |
18.13 |
| 2026-09-25 12:00 |
04:07:57.21 |
+32:48:39.3 |
HIP 19240 |
17.98 |
| 2026-09-26 00:00 |
04:07:55.74 |
+32:48:41.3 |
HIP 19240 |
17.84 |
| 2026-09-26 12:00 |
04:07:54.25 |
+32:48:43.2 |
HIP 19240 |
17.70 |
| 2026-09-27 00:00 |
04:07:52.74 |
+32:48:45.0 |
HIP 19240 |
17.56 |
| 2026-09-27 12:00 |
04:07:51.20 |
+32:48:46.8 |
HIP 19240 |
17.42 |
| 2026-09-28 00:00 |
04:07:49.64 |
+32:48:48.5 |
HIP 19240 |
17.29 |
| 2026-09-28 12:00 |
04:07:48.06 |
+32:48:50.0 |
HIP 19240 |
17.17 |
| 2026-09-29 00:00 |
04:07:46.46 |
+32:48:51.5 |
HIP 19240 |
17.05 |
| 2026-09-29 12:00 |
04:07:44.84 |
+32:48:52.9 |
HIP 19240 |
16.94 |
| 2026-09-30 00:00 |
04:07:43.19 |
+32:48:54.3 |
HIP 19240 |
16.84 |
| 2026-09-30 12:00 |
04:07:41.52 |
+32:48:55.5 |
HIP 19240 |
16.74 |
| 2026-10-01 00:00 |
04:07:39.83 |
+32:48:56.6 |
HIP 19240 |
16.65 |
| 2026-10-01 12:00 |
04:07:38.11 |
+32:48:57.7 |
HIP 19240 |
16.57 |
| 2026-10-02 00:00 |
04:07:36.38 |
+32:48:58.6 |
HIP 19240 |
16.49 |
| 2026-10-02 12:00 |
04:07:34.62 |
+32:48:59.5 |
HIP 19240 |
16.43 |
| 2026-10-03 00:00 |
04:07:32.84 |
+32:49:00.3 |
HIP 19240 |
16.37 |
| 2026-10-03 12:00 |
04:07:31.04 |
+32:49:00.9 |
HIP 19240 |
16.32 |
| 2026-10-04 00:00 |
04:07:29.22 |
+32:49:01.5 |
HIP 19240 |
16.28 |
| 2026-10-04 12:00 |
04:07:27.37 |
+32:49:02.0 |
HIP 19240 |
16.26 |
| 2026-10-05 00:00 |
04:07:25.51 |
+32:49:02.5 |
HIP 19240 |
16.24 |
| 2026-10-05 12:00 |
04:07:23.62 |
+32:49:02.8 |
HIP 19240 |
16.23 |
| 2026-10-06 00:00 |
04:07:21.72 |
+32:49:03.0 |
HIP 19240 |
16.24 |
| 2026-10-06 12:00 |
04:07:19.79 |
+32:49:03.1 |
HIP 19240 |
16.26 |
| 2026-10-07 00:00 |
04:07:17.84 |
+32:49:03.2 |
HIP 19143 |
16.16 |
| 2026-10-07 12:00 |
04:07:15.87 |
+32:49:03.1 |
HIP 19143 |
15.80 |
| 2026-10-08 00:00 |
04:07:13.88 |
+32:49:03.0 |
HIP 19143 |
15.45 |
| 2026-10-08 12:00 |
04:07:11.87 |
+32:49:02.7 |
HIP 19143 |
15.09 |
| 2026-10-09 00:00 |
04:07:09.84 |
+32:49:02.4 |
HIP 19143 |
14.74 |
| 2026-10-09 12:00 |
04:07:07.79 |
+32:49:01.9 |
HIP 19143 |
14.39 |
| 2026-10-10 00:00 |
04:07:05.72 |
+32:49:01.4 |
HIP 19143 |
14.04 |
| 2026-10-10 12:00 |
04:07:03.63 |
+32:49:00.8 |
HIP 19143 |
13.69 |
| 2026-10-11 00:00 |
04:07:01.52 |
+32:49:00.1 |
HIP 19143 |
13.34 |