メタデータ
| 項目 |
値 |
| Designation |
391P/Kowalski |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-02-19T21:01:27.626880Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:26Z |
| Obs used |
261 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
10.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-10-22T00:19:10.848000Z |
| Discovery magnitude (MPC) |
20.30 N |
| Discovery observatory (MPC) |
J22 · Tacande Observatory, La Palma |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-11-18.0000000 |
| e |
0.11956279 |
| q (au) |
4.119554 |
| a (au) |
4.678987 |
| i (deg) |
21.275094 |
| Ω (om, deg) |
124.763090 |
| ω (w, deg) |
186.875752 |
| M (ma, deg) |
26.499836 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-07-29 00:00 |
15:07:50.85 |
+04:14:27.8 |
HIP 73971 |
18.14 |
| 2026-07-29 12:00 |
15:07:56.68 |
+04:11:18.7 |
HIP 74079 |
16.37 |
| 2026-07-30 00:00 |
15:08:02.71 |
+04:08:09.0 |
HIP 74079 |
12.89 |
| 2026-07-30 12:00 |
15:08:08.93 |
+04:04:58.7 |
HIP 74079 |
9.42 |
| 2026-07-31 00:00 |
15:08:15.34 |
+04:01:47.9 |
HIP 74079 |
6.00 |
| 2026-07-31 12:00 |
15:08:21.95 |
+03:58:36.6 |
HIP 74079 |
2.94 |
| 2026-08-01 00:00 |
15:08:28.75 |
+03:55:24.8 |
HIP 74079 |
2.70 |
| 2026-08-01 12:00 |
15:08:35.74 |
+03:52:12.5 |
HIP 74079 |
5.71 |
| 2026-08-02 00:00 |
15:08:42.93 |
+03:48:59.7 |
HIP 74079 |
9.24 |
| 2026-08-02 12:00 |
15:08:50.30 |
+03:45:46.4 |
HIP 74182 |
11.26 |
| 2026-08-03 00:00 |
15:08:57.87 |
+03:42:32.6 |
HIP 74182 |
12.04 |
| 2026-08-03 12:00 |
15:09:05.62 |
+03:39:18.4 |
HIP 74202 |
10.92 |
| 2026-08-04 00:00 |
15:09:13.57 |
+03:36:03.7 |
HIP 74202 |
10.64 |
| 2026-08-04 12:00 |
15:09:21.70 |
+03:32:48.6 |
HIP 74202 |
11.64 |
| 2026-08-05 00:00 |
15:09:30.02 |
+03:29:33.1 |
HIP 74202 |
13.67 |
| 2026-08-05 12:00 |
15:09:38.53 |
+03:26:17.1 |
HIP 74190 |
16.36 |
| 2026-08-06 00:00 |
15:09:47.23 |
+03:23:00.8 |
HIP 74190 |
13.37 |
| 2026-08-06 12:00 |
15:09:56.12 |
+03:19:44.0 |
HIP 74190 |
11.01 |
| 2026-08-07 00:00 |
15:10:05.19 |
+03:16:26.8 |
HIP 74190 |
9.78 |
| 2026-08-07 12:00 |
15:10:14.44 |
+03:13:09.3 |
HIP 74190 |
10.13 |
| 2026-08-08 00:00 |
15:10:23.89 |
+03:09:51.4 |
HIP 74190 |
11.97 |
| 2026-08-08 12:00 |
15:10:33.51 |
+03:06:33.2 |
HIP 74190 |
14.76 |
| 2026-08-09 00:00 |
15:10:43.33 |
+03:03:14.5 |
HIP 74328 |
17.85 |
| 2026-08-09 12:00 |
15:10:53.32 |
+02:59:55.6 |
HIP 74328 |
13.71 |
| 2026-08-10 00:00 |
15:11:03.50 |
+02:56:36.3 |
HIP 74328 |
9.54 |
| 2026-08-10 12:00 |
15:11:13.87 |
+02:53:16.7 |
HIP 74328 |
5.37 |
| 2026-08-11 00:00 |
15:11:24.41 |
+02:49:56.9 |
HIP 74328 |
1.40 |
| 2026-08-11 12:00 |
15:11:35.14 |
+02:46:36.7 |
HIP 74328 |
3.36 |
| 2026-08-12 00:00 |
15:11:46.04 |
+02:43:16.2 |
HIP 74328 |
7.59 |
| 2026-08-12 12:00 |
15:11:57.13 |
+02:39:55.5 |
HIP 74328 |
11.91 |
| 2026-08-13 00:00 |
15:12:08.40 |
+02:36:34.5 |
HIP 74328 |
16.27 |
| 2026-08-13 12:00 |
15:12:19.84 |
+02:33:13.2 |
HIP 74364 |
20.61 |
| 2026-08-14 00:00 |
15:12:31.47 |
+02:29:51.7 |
HIP 74364 |
18.95 |
| 2026-08-14 12:00 |
15:12:43.27 |
+02:26:30.0 |
HIP 74513 |
17.38 |
| 2026-08-15 00:00 |
15:12:55.25 |
+02:23:08.1 |
HIP 74513 |
12.93 |
| 2026-08-15 12:00 |
15:13:07.40 |
+02:19:45.9 |
HIP 74513 |
8.48 |
| 2026-08-16 00:00 |
15:13:19.73 |
+02:16:23.6 |
HIP 74513 |
4.18 |
| 2026-08-16 12:00 |
15:13:32.23 |
+02:13:01.1 |
HIP 74513 |
2.18 |
| 2026-08-17 00:00 |
15:13:44.91 |
+02:09:38.4 |
HIP 74513 |
5.87 |
| 2026-08-17 12:00 |
15:13:57.76 |
+02:06:15.6 |
HIP 74513 |
10.38 |
| 2026-08-18 00:00 |
15:14:10.78 |
+02:02:52.5 |
HIP 74513 |
15.00 |
| 2026-08-18 12:00 |
15:14:23.97 |
+01:59:29.4 |
HIP 74562 |
16.58 |
| 2026-08-19 00:00 |
15:14:37.33 |
+01:56:06.1 |
HIP 74562 |
14.75 |