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) |
| 2026-05-12 00:00 |
06:50:33.66 |
+26:13:08.7 |
HIP 32873 |
20.33 |
| 2026-05-12 12:00 |
06:51:06.96 |
+26:12:49.1 |
HIP 32959 |
15.29 |
| 2026-05-13 00:00 |
06:51:40.42 |
+26:12:28.9 |
HIP 32959 |
11.90 |
| 2026-05-13 12:00 |
06:52:14.04 |
+26:12:08.2 |
HIP 32959 |
12.76 |
| 2026-05-14 00:00 |
06:52:47.80 |
+26:11:46.9 |
HIP 32959 |
17.28 |
| 2026-05-14 12:00 |
06:53:21.72 |
+26:11:25.0 |
HIP 32959 |
23.47 |
| 2026-05-15 00:00 |
06:53:55.78 |
+26:11:02.5 |
HIP 33194 |
22.11 |
| 2026-05-15 12:00 |
06:54:30.00 |
+26:10:39.5 |
HIP 33194 |
21.19 |
| 2026-05-16 00:00 |
06:55:04.36 |
+26:10:15.8 |
HIP 33356 |
20.46 |
| 2026-05-16 12:00 |
06:55:38.87 |
+26:09:51.6 |
HIP 33356 |
14.82 |
| 2026-05-17 00:00 |
06:56:13.52 |
+26:09:26.8 |
HIP 33356 |
11.87 |
| 2026-05-17 12:00 |
06:56:48.32 |
+26:09:01.3 |
HIP 33356 |
13.55 |
| 2026-05-18 00:00 |
06:57:23.26 |
+26:08:35.3 |
HIP 33356 |
18.71 |
| 2026-05-18 12:00 |
06:57:58.35 |
+26:08:08.7 |
HIP 33595 |
11.52 |
| 2026-05-19 00:00 |
06:58:33.57 |
+26:07:41.4 |
HIP 33595 |
4.23 |
| 2026-05-19 12:00 |
06:59:08.93 |
+26:07:13.6 |
HIP 33595 |
5.36 |
| 2026-05-20 00:00 |
06:59:44.43 |
+26:06:45.1 |
HIP 33650 |
12.46 |
| 2026-05-20 12:00 |
07:00:20.07 |
+26:06:16.0 |
HIP 33793 |
12.11 |
| 2026-05-21 00:00 |
07:00:55.84 |
+26:05:46.3 |
HIP 33793 |
8.34 |
| 2026-05-21 12:00 |
07:01:31.75 |
+26:05:15.9 |
HIP 33793 |
11.05 |
| 2026-05-22 00:00 |
07:02:07.79 |
+26:04:45.0 |
HIP 33831 |
16.26 |
| 2026-05-22 12:00 |
07:02:43.97 |
+26:04:13.4 |
HIP 33831 |
22.45 |
| 2026-05-23 00:00 |
07:03:20.27 |
+26:03:41.1 |
HIP 33831 |
29.62 |
| 2026-05-23 12:00 |
07:03:56.71 |
+26:03:08.3 |
HIP 33831 |
37.24 |
| 2026-05-24 00:00 |
07:04:33.27 |
+26:02:34.8 |
HIP 34061 |
38.40 |
| 2026-05-24 12:00 |
07:05:09.96 |
+26:02:00.6 |
HIP 34061 |
40.55 |
| 2026-05-25 00:00 |
07:05:46.78 |
+26:01:25.8 |
HIP 34061 |
44.18 |
| 2026-05-25 12:00 |
07:06:23.73 |
+26:00:50.4 |
HIP 34567 |
46.40 |
| 2026-05-26 00:00 |
07:07:00.80 |
+26:00:14.3 |
HIP 34567 |
38.51 |
| 2026-05-26 12:00 |
07:07:37.99 |
+25:59:37.5 |
HIP 34567 |
30.83 |
| 2026-05-27 00:00 |
07:08:15.31 |
+25:59:00.1 |
HIP 34567 |
23.62 |
| 2026-05-27 12:00 |
07:08:52.75 |
+25:58:22.1 |
HIP 34567 |
17.50 |
| 2026-05-28 00:00 |
07:09:30.31 |
+25:57:43.3 |
HIP 34582 |
13.98 |
| 2026-05-28 12:00 |
07:10:07.99 |
+25:57:03.9 |
HIP 34582 |
14.03 |
| 2026-05-29 00:00 |
07:10:45.79 |
+25:56:23.9 |
HIP 34582 |
18.53 |
| 2026-05-29 12:00 |
07:11:23.71 |
+25:55:43.1 |
HIP 34861 |
22.09 |
| 2026-05-30 00:00 |
07:12:01.75 |
+25:55:01.7 |
HIP 34861 |
14.73 |
| 2026-05-30 12:00 |
07:12:39.91 |
+25:54:19.6 |
HIP 34861 |
9.64 |
| 2026-05-31 00:00 |
07:13:18.18 |
+25:53:36.8 |
HIP 34861 |
10.84 |
| 2026-05-31 12:00 |
07:13:56.57 |
+25:52:53.4 |
HIP 35070 |
16.06 |
| 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 |