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) |
| 2026-06-01 00:00 |
04:03:31.11 |
+32:21:09.0 |
HIP 19013 |
19.62 |
| 2026-06-01 12:00 |
04:03:34.00 |
+32:21:15.6 |
HIP 19013 |
19.18 |
| 2026-06-02 00:00 |
04:03:36.88 |
+32:21:22.2 |
HIP 19013 |
18.76 |
| 2026-06-02 12:00 |
04:03:39.76 |
+32:21:28.9 |
HIP 19013 |
18.35 |
| 2026-06-03 00:00 |
04:03:42.64 |
+32:21:35.6 |
HIP 19013 |
17.95 |
| 2026-06-03 12:00 |
04:03:45.51 |
+32:21:42.4 |
HIP 19039 |
17.47 |
| 2026-06-04 00:00 |
04:03:48.38 |
+32:21:49.2 |
HIP 19039 |
16.97 |
| 2026-06-04 12:00 |
04:03:51.25 |
+32:21:56.1 |
HIP 19039 |
16.48 |
| 2026-06-05 00:00 |
04:03:54.11 |
+32:22:03.0 |
HIP 19039 |
16.00 |
| 2026-06-05 12:00 |
04:03:56.97 |
+32:22:09.9 |
HIP 19039 |
15.53 |
| 2026-06-06 00:00 |
04:03:59.82 |
+32:22:17.0 |
HIP 19039 |
15.07 |
| 2026-06-06 12:00 |
04:04:02.67 |
+32:22:24.0 |
HIP 19039 |
14.61 |
| 2026-06-07 00:00 |
04:04:05.51 |
+32:22:31.1 |
HIP 19039 |
14.18 |
| 2026-06-07 12:00 |
04:04:08.34 |
+32:22:38.3 |
HIP 19039 |
13.75 |
| 2026-06-08 00:00 |
04:04:11.17 |
+32:22:45.5 |
HIP 19039 |
13.34 |
| 2026-06-08 12:00 |
04:04:14.00 |
+32:22:52.7 |
HIP 19039 |
12.94 |
| 2026-06-09 00:00 |
04:04:16.82 |
+32:23:00.0 |
HIP 19039 |
12.56 |
| 2026-06-09 12:00 |
04:04:19.63 |
+32:23:07.3 |
HIP 19039 |
12.20 |
| 2026-06-10 00:00 |
04:04:22.44 |
+32:23:14.7 |
HIP 19039 |
11.86 |
| 2026-06-10 12:00 |
04:04:25.24 |
+32:23:22.1 |
HIP 19039 |
11.54 |
| 2026-06-11 00:00 |
04:04:28.04 |
+32:23:29.5 |
HIP 19039 |
11.24 |
| 2026-06-11 12:00 |
04:04:30.83 |
+32:23:37.0 |
HIP 19039 |
10.97 |
| 2026-06-12 00:00 |
04:04:33.61 |
+32:23:44.5 |
HIP 19039 |
10.72 |
| 2026-06-12 12:00 |
04:04:36.38 |
+32:23:52.1 |
HIP 19039 |
10.50 |
| 2026-06-13 00:00 |
04:04:39.15 |
+32:23:59.7 |
HIP 19039 |
10.31 |
| 2026-06-13 12:00 |
04:04:41.91 |
+32:24:07.3 |
HIP 19039 |
10.15 |
| 2026-06-14 00:00 |
04:04:44.66 |
+32:24:15.0 |
HIP 19039 |
10.03 |
| 2026-06-14 12:00 |
04:04:47.40 |
+32:24:22.7 |
HIP 19039 |
9.94 |
| 2026-06-15 00:00 |
04:04:50.14 |
+32:24:30.5 |
HIP 19039 |
9.88 |
| 2026-06-15 12:00 |
04:04:52.86 |
+32:24:38.3 |
HIP 19039 |
9.85 |
| 2026-06-16 00:00 |
04:04:55.58 |
+32:24:46.1 |
HIP 19039 |
9.86 |
| 2026-06-16 12:00 |
04:04:58.29 |
+32:24:54.0 |
HIP 19039 |
9.91 |
| 2026-06-17 00:00 |
04:05:00.99 |
+32:25:01.9 |
HIP 19039 |
9.99 |
| 2026-06-17 12:00 |
04:05:03.68 |
+32:25:09.8 |
HIP 19039 |
10.09 |
| 2026-06-18 00:00 |
04:05:06.37 |
+32:25:17.8 |
HIP 19039 |
10.23 |
| 2026-06-18 12:00 |
04:05:09.04 |
+32:25:25.8 |
HIP 19039 |
10.40 |
| 2026-06-19 00:00 |
04:05:11.70 |
+32:25:33.8 |
HIP 19039 |
10.60 |
| 2026-06-19 12:00 |
04:05:14.35 |
+32:25:41.8 |
HIP 19039 |
10.82 |
| 2026-06-20 00:00 |
04:05:17.00 |
+32:25:49.9 |
HIP 19039 |
11.07 |
| 2026-06-20 12:00 |
04:05:19.63 |
+32:25:58.0 |
HIP 19039 |
11.33 |
| 2026-06-21 00:00 |
04:05:22.25 |
+32:26:06.2 |
HIP 19039 |
11.62 |
| 2026-06-21 12:00 |
04:05:24.87 |
+32:26:14.3 |
HIP 19039 |
11.93 |
| 2026-06-22 00:00 |
04:05:27.47 |
+32:26:22.5 |
HIP 19039 |
12.25 |