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) |
| 2026-03-26 00:00 |
03:57:51.79 |
+32:17:10.0 |
HIP 18397 |
25.03 |
| 2026-03-26 12:00 |
03:57:53.43 |
+32:17:06.1 |
HIP 18397 |
25.35 |
| 2026-03-27 00:00 |
03:57:55.10 |
+32:17:02.3 |
HIP 18397 |
25.67 |
| 2026-03-27 12:00 |
03:57:56.78 |
+32:16:58.6 |
HIP 18397 |
25.99 |
| 2026-03-28 00:00 |
03:57:58.49 |
+32:16:55.0 |
HIP 18397 |
26.32 |
| 2026-03-28 12:00 |
03:58:00.21 |
+32:16:51.5 |
HIP 18397 |
26.66 |
| 2026-03-29 00:00 |
03:58:01.95 |
+32:16:48.1 |
HIP 18670 |
26.87 |
| 2026-03-29 12:00 |
03:58:03.72 |
+32:16:44.7 |
HIP 18670 |
26.52 |
| 2026-03-30 00:00 |
03:58:05.50 |
+32:16:41.5 |
HIP 18670 |
26.16 |
| 2026-03-30 12:00 |
03:58:07.30 |
+32:16:38.3 |
HIP 18670 |
25.80 |
| 2026-03-31 00:00 |
03:58:09.12 |
+32:16:35.3 |
HIP 18670 |
25.45 |
| 2026-03-31 12:00 |
03:58:10.97 |
+32:16:32.3 |
HIP 18670 |
25.08 |
| 2026-04-01 00:00 |
03:58:12.83 |
+32:16:29.4 |
HIP 18670 |
24.72 |
| 2026-04-01 12:00 |
03:58:14.71 |
+32:16:26.6 |
HIP 18670 |
24.36 |
| 2026-04-02 00:00 |
03:58:16.60 |
+32:16:23.9 |
HIP 18670 |
23.99 |
| 2026-04-02 12:00 |
03:58:18.52 |
+32:16:21.3 |
HIP 18670 |
23.62 |
| 2026-04-03 00:00 |
03:58:20.46 |
+32:16:18.8 |
HIP 18670 |
23.25 |
| 2026-04-03 12:00 |
03:58:22.41 |
+32:16:16.4 |
HIP 18670 |
22.88 |
| 2026-04-04 00:00 |
03:58:24.38 |
+32:16:14.1 |
HIP 18670 |
22.51 |
| 2026-04-04 12:00 |
03:58:26.37 |
+32:16:11.8 |
HIP 18670 |
22.14 |
| 2026-04-05 00:00 |
03:58:28.38 |
+32:16:09.7 |
HIP 18670 |
21.77 |
| 2026-04-05 12:00 |
03:58:30.41 |
+32:16:07.7 |
HIP 18670 |
21.40 |
| 2026-04-06 00:00 |
03:58:32.45 |
+32:16:05.7 |
HIP 18670 |
21.03 |
| 2026-04-06 12:00 |
03:58:34.51 |
+32:16:03.8 |
HIP 18670 |
20.66 |
| 2026-04-07 00:00 |
03:58:36.59 |
+32:16:02.1 |
HIP 18670 |
20.28 |
| 2026-04-07 12:00 |
03:58:38.68 |
+32:16:00.4 |
HIP 18670 |
19.91 |
| 2026-04-08 00:00 |
03:58:40.80 |
+32:15:58.8 |
HIP 18670 |
19.55 |
| 2026-04-08 12:00 |
03:58:42.93 |
+32:15:57.3 |
HIP 18670 |
19.18 |
| 2026-04-09 00:00 |
03:58:45.07 |
+32:15:55.9 |
HIP 18670 |
18.81 |
| 2026-04-09 12:00 |
03:58:47.24 |
+32:15:54.6 |
HIP 18670 |
18.45 |
| 2026-04-10 00:00 |
03:58:49.42 |
+32:15:53.3 |
HIP 18670 |
18.09 |
| 2026-04-10 12:00 |
03:58:51.61 |
+32:15:52.2 |
HIP 18670 |
17.73 |
| 2026-04-11 00:00 |
03:58:53.82 |
+32:15:51.1 |
HIP 18670 |
17.38 |
| 2026-04-11 12:00 |
03:58:56.05 |
+32:15:50.2 |
HIP 18670 |
17.03 |
| 2026-04-12 00:00 |
03:58:58.30 |
+32:15:49.3 |
HIP 18670 |
16.69 |
| 2026-04-12 12:00 |
03:59:00.56 |
+32:15:48.6 |
HIP 18670 |
16.35 |
| 2026-04-13 00:00 |
03:59:02.83 |
+32:15:47.9 |
HIP 18670 |
16.02 |
| 2026-04-13 12:00 |
03:59:05.12 |
+32:15:47.3 |
HIP 18670 |
15.69 |
| 2026-04-14 00:00 |
03:59:07.43 |
+32:15:46.8 |
HIP 18670 |
15.37 |
| 2026-04-14 12:00 |
03:59:09.75 |
+32:15:46.4 |
HIP 18670 |
15.06 |
| 2026-04-15 00:00 |
03:59:12.08 |
+32:15:46.0 |
HIP 18670 |
14.76 |
| 2026-04-15 12:00 |
03:59:14.43 |
+32:15:45.8 |
HIP 18670 |
14.47 |
| 2026-04-16 00:00 |
03:59:16.80 |
+32:15:45.7 |
HIP 18670 |
14.19 |