メタデータ
| 項目 |
値 |
| Designation |
398P/Boattini |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-12-26T17:48:49.337280Z |
| Orbit solution date (soln_date, UTC) |
2025-09-10T22:25:49Z |
| Obs used |
1644 |
| NEO |
- |
| M1 |
15.200 |
| K1 |
11.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-08-11T13:58:29.683200Z |
| Discovery magnitude (MPC) |
19.11 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-11-12.0000000 |
| e |
0.58256076 |
| q (au) |
1.305705 |
| a (au) |
3.127893 |
| i (deg) |
11.015212 |
| Ω (om, deg) |
127.464461 |
| ω (w, deg) |
320.231140 |
| M (ma, deg) |
352.028427 |
等級
散乱 + 全体線形
$$
M_a = (20.000 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
20.000 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.883 |
| k |
0.995 |
| δ90 |
10.000 |
| 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) |
| 2026-03-26 00:00 |
00:55:36.82 |
-01:11:21.2 |
HIP 4314 |
19.71 |
| 2026-03-26 12:00 |
00:56:49.53 |
-01:03:56.9 |
HIP 4314 |
35.54 |
| 2026-03-27 00:00 |
00:58:02.42 |
-00:56:31.9 |
HIP 4619 |
25.27 |
| 2026-03-27 12:00 |
00:59:15.50 |
-00:49:06.2 |
HIP 4619 |
8.72 |
| 2026-03-28 00:00 |
01:00:28.76 |
-00:41:39.9 |
HIP 4619 |
17.11 |
| 2026-03-28 12:00 |
01:01:42.21 |
-00:34:12.8 |
HIP 4795 |
15.12 |
| 2026-03-29 00:00 |
01:02:55.85 |
-00:26:45.2 |
HIP 4795 |
21.74 |
| 2026-03-29 12:00 |
01:04:09.67 |
-00:19:16.8 |
HIP 5181 |
31.61 |
| 2026-03-30 00:00 |
01:05:23.68 |
-00:11:47.9 |
HIP 5181 |
13.57 |
| 2026-03-30 12:00 |
01:06:37.88 |
-00:04:18.3 |
HIP 5181 |
12.90 |
| 2026-03-31 00:00 |
01:07:52.27 |
+00:03:11.9 |
HIP 5181 |
30.85 |
| 2026-03-31 12:00 |
01:09:06.85 |
+00:10:42.7 |
HIP 5181 |
50.46 |
| 2026-04-01 00:00 |
01:10:21.62 |
+00:18:14.0 |
HIP 5603 |
50.21 |
| 2026-04-01 12:00 |
01:11:36.59 |
+00:25:45.9 |
HIP 5647 |
35.86 |
| 2026-04-02 00:00 |
01:12:51.75 |
+00:33:18.4 |
HIP 5647 |
26.09 |
| 2026-04-02 12:00 |
01:14:07.11 |
+00:40:51.5 |
HIP 5886 |
26.13 |
| 2026-04-03 00:00 |
01:15:22.66 |
+00:48:25.0 |
HIP 5886 |
7.11 |
| 2026-04-03 12:00 |
01:16:38.41 |
+00:55:59.1 |
HIP 5886 |
15.74 |
| 2026-04-04 00:00 |
01:17:54.36 |
+01:03:33.7 |
HIP 6049 |
6.28 |
| 2026-04-04 12:00 |
01:19:10.51 |
+01:11:08.8 |
HIP 6112 |
16.68 |
| 2026-04-05 00:00 |
01:20:26.86 |
+01:18:44.4 |
HIP 6112 |
36.04 |
| 2026-04-05 12:00 |
01:21:43.41 |
+01:26:20.4 |
HIP 6432 |
21.82 |
| 2026-04-06 00:00 |
01:23:00.16 |
+01:33:56.8 |
HIP 6432 |
11.25 |
| 2026-04-06 12:00 |
01:24:17.12 |
+01:41:33.7 |
HIP 6509 |
16.03 |
| 2026-04-07 00:00 |
01:25:34.29 |
+01:49:11.0 |
HIP 6653 |
21.81 |
| 2026-04-07 12:00 |
01:26:51.66 |
+01:56:48.7 |
HIP 6777 |
11.67 |
| 2026-04-08 00:00 |
01:28:09.23 |
+02:04:26.8 |
HIP 6777 |
15.71 |
| 2026-04-08 12:00 |
01:29:27.02 |
+02:12:05.3 |
HIP 7054 |
21.87 |
| 2026-04-09 00:00 |
01:30:45.01 |
+02:19:44.1 |
HIP 7054 |
6.87 |
| 2026-04-09 12:00 |
01:32:03.22 |
+02:27:23.2 |
HIP 7054 |
22.23 |
| 2026-04-10 00:00 |
01:33:21.63 |
+02:35:02.6 |
HIP 7295 |
8.65 |
| 2026-04-10 12:00 |
01:34:40.26 |
+02:42:42.4 |
HIP 7295 |
14.12 |
| 2026-04-11 00:00 |
01:35:59.10 |
+02:50:22.4 |
HIP 7295 |
34.87 |
| 2026-04-11 12:00 |
01:37:18.15 |
+02:58:02.6 |
HIP 7632 |
27.59 |
| 2026-04-12 00:00 |
01:38:37.42 |
+03:05:43.1 |
HIP 7747 |
27.25 |
| 2026-04-12 12:00 |
01:39:56.90 |
+03:13:23.9 |
HIP 7747 |
14.30 |
| 2026-04-13 00:00 |
01:41:16.61 |
+03:21:04.8 |
HIP 7860 |
21.88 |
| 2026-04-13 12:00 |
01:42:36.52 |
+03:28:45.9 |
HIP 8090 |
19.95 |
| 2026-04-14 00:00 |
01:43:56.66 |
+03:36:27.1 |
HIP 8090 |
1.58 |
| 2026-04-14 12:00 |
01:45:17.02 |
+03:44:08.5 |
HIP 8211 |
7.85 |
| 2026-04-15 00:00 |
01:46:37.59 |
+03:51:50.0 |
HIP 8329 |
11.56 |
| 2026-04-15 12:00 |
01:47:58.39 |
+03:59:31.6 |
HIP 8329 |
10.10 |
| 2026-04-16 00:00 |
01:49:19.41 |
+04:07:13.3 |
HIP 8605 |
26.03 |