メタデータ
| 項目 |
値 |
| Designation |
417P/NEOWISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-04-21T21:50:27.404160Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T14:06:24Z |
| Obs used |
277 |
| NEO |
- |
| M1 |
17.500 |
| K1 |
6.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-01-17T05:24:50.284800Z |
| Discovery magnitude (MPC) |
20.40 T |
| Discovery observatory (MPC) |
Z84 · Calar Alto-Schmidt |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-01-27.0000000 |
| e |
0.55459375 |
| q (au) |
1.492286 |
| a (au) |
3.350393 |
| i (deg) |
8.129115 |
| Ω (om, deg) |
111.357188 |
| ω (w, deg) |
129.397423 |
| M (ma, deg) |
228.869825 |
等級
散乱 + 全体線形
$$
M_a = (17.824 + 3.206\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.824 |
| n |
3.206 |
| gf |
0.800 |
| gb |
-0.673 |
| k |
0.914 |
| δ90 |
1.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
07:14:35.07 |
+25:52:09.2 |
HIP 35070 |
7.43 |
| 2026-06-01 12:00 |
07:15:13.69 |
+25:51:24.4 |
HIP 35070 |
1.91 |
| 2026-06-02 00:00 |
07:15:52.42 |
+25:50:38.8 |
HIP 35070 |
10.23 |
| 2026-06-02 12:00 |
07:16:31.27 |
+25:49:52.6 |
HIP 35070 |
18.97 |
| 2026-06-03 00:00 |
07:17:10.23 |
+25:49:05.7 |
HIP 35435 |
24.68 |
| 2026-06-03 12:00 |
07:17:49.29 |
+25:48:18.0 |
HIP 35435 |
16.88 |
| 2026-06-04 00:00 |
07:18:28.47 |
+25:47:29.7 |
HIP 35435 |
10.78 |
| 2026-06-04 12:00 |
07:19:07.76 |
+25:46:40.6 |
HIP 35435 |
10.23 |
| 2026-06-05 00:00 |
07:19:47.16 |
+25:45:50.8 |
HIP 35435 |
15.86 |
| 2026-06-05 12:00 |
07:20:26.67 |
+25:45:00.4 |
HIP 35624 |
9.59 |
| 2026-06-06 00:00 |
07:21:06.29 |
+25:44:09.1 |
HIP 35624 |
4.08 |
| 2026-06-06 12:00 |
07:21:46.01 |
+25:43:17.2 |
HIP 35624 |
10.12 |
| 2026-06-07 00:00 |
07:22:25.84 |
+25:42:24.6 |
HIP 35624 |
18.73 |
| 2026-06-07 12:00 |
07:23:05.78 |
+25:41:31.2 |
HIP 35624 |
27.63 |
| 2026-06-08 00:00 |
07:23:45.82 |
+25:40:37.1 |
HIP 35624 |
36.62 |
| 2026-06-08 12:00 |
07:24:25.96 |
+25:39:42.2 |
HIP 36110 |
30.79 |
| 2026-06-09 00:00 |
07:25:06.22 |
+25:38:46.6 |
HIP 36110 |
24.60 |
| 2026-06-09 12:00 |
07:25:46.57 |
+25:37:50.3 |
HIP 36110 |
20.71 |
| 2026-06-10 00:00 |
07:26:27.03 |
+25:36:53.2 |
HIP 36110 |
20.48 |
| 2026-06-10 12:00 |
07:27:07.59 |
+25:35:55.4 |
HIP 36110 |
24.06 |
| 2026-06-11 00:00 |
07:27:48.25 |
+25:34:56.8 |
HIP 36110 |
30.14 |
| 2026-06-11 12:00 |
07:28:29.01 |
+25:33:57.5 |
HIP 36483 |
26.95 |
| 2026-06-12 00:00 |
07:29:09.87 |
+25:32:57.5 |
HIP 36483 |
17.85 |
| 2026-06-12 12:00 |
07:29:50.83 |
+25:31:56.6 |
HIP 36483 |
9.07 |
| 2026-06-13 00:00 |
07:30:31.89 |
+25:30:55.1 |
HIP 36483 |
4.35 |
| 2026-06-13 12:00 |
07:31:13.04 |
+25:29:52.7 |
HIP 36483 |
11.40 |
| 2026-06-14 00:00 |
07:31:54.30 |
+25:28:49.6 |
HIP 36483 |
20.41 |
| 2026-06-14 12:00 |
07:32:35.64 |
+25:27:45.8 |
HIP 36765 |
15.56 |
| 2026-06-15 00:00 |
07:33:17.09 |
+25:26:41.2 |
HIP 36765 |
6.33 |
| 2026-06-15 12:00 |
07:33:58.63 |
+25:25:35.8 |
HIP 36765 |
3.96 |
| 2026-06-16 00:00 |
07:34:40.26 |
+25:24:29.6 |
HIP 36907 |
12.52 |
| 2026-06-16 12:00 |
07:35:21.98 |
+25:23:22.7 |
HIP 36907 |
10.61 |
| 2026-06-17 00:00 |
07:36:03.79 |
+25:22:15.0 |
HIP 36907 |
15.79 |
| 2026-06-17 12:00 |
07:36:45.70 |
+25:21:06.6 |
HIP 37064 |
23.25 |
| 2026-06-18 00:00 |
07:37:27.69 |
+25:19:57.3 |
HIP 37191 |
20.32 |
| 2026-06-18 12:00 |
07:38:09.78 |
+25:18:47.3 |
HIP 37191 |
14.71 |
| 2026-06-19 00:00 |
07:38:51.95 |
+25:17:36.6 |
HIP 37191 |
14.27 |
| 2026-06-19 12:00 |
07:39:34.20 |
+25:16:25.0 |
HIP 37191 |
19.39 |
| 2026-06-20 00:00 |
07:40:16.55 |
+25:15:12.7 |
HIP 37434 |
20.26 |
| 2026-06-20 12:00 |
07:40:58.98 |
+25:13:59.6 |
HIP 37434 |
16.11 |
| 2026-06-21 00:00 |
07:41:41.49 |
+25:12:45.7 |
HIP 37434 |
17.20 |
| 2026-06-21 12:00 |
07:42:24.09 |
+25:11:31.0 |
HIP 37434 |
22.82 |
| 2026-06-22 00:00 |
07:43:06.77 |
+25:10:15.6 |
HIP 37434 |
30.59 |