メタデータ
| 項目 |
値 |
| Designation |
P/2023 M2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-07-25T07:27:49.250880Z |
| Orbit solution date (soln_date, UTC) |
2024-10-05T23:12:36Z |
| Obs used |
117 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
18.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-09-01.0000000 |
| e |
0.36933815 |
| q (au) |
3.508349 |
| a (au) |
5.562964 |
| i (deg) |
19.725462 |
| Ω (om, deg) |
83.267905 |
| ω (w, deg) |
243.020623 |
| M (ma, deg) |
2.831128 |
等級
散乱 + 全体線形
$$
M_a = (7.606 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.606 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2023-07-25 |
2024-09-29 |
+22.4930 |
-12.377 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
06:50:59.86 |
+26:05:16.6 |
HIP 32873 |
11.57 |
| 2026-09-20 12:00 |
06:51:11.47 |
+26:05:50.4 |
HIP 32873 |
12.40 |
| 2026-09-21 00:00 |
06:51:22.94 |
+26:06:24.5 |
HIP 32873 |
13.69 |
| 2026-09-21 12:00 |
06:51:34.26 |
+26:06:58.8 |
HIP 32873 |
15.32 |
| 2026-09-22 00:00 |
06:51:45.44 |
+26:07:33.4 |
HIP 32959 |
16.56 |
| 2026-09-22 12:00 |
06:51:56.47 |
+26:08:08.3 |
HIP 32959 |
15.90 |
| 2026-09-23 00:00 |
06:52:07.35 |
+26:08:43.4 |
HIP 32959 |
15.62 |
| 2026-09-23 12:00 |
06:52:18.09 |
+26:09:18.8 |
HIP 32959 |
15.72 |
| 2026-09-24 00:00 |
06:52:28.67 |
+26:09:54.4 |
HIP 32959 |
16.18 |
| 2026-09-24 12:00 |
06:52:39.11 |
+26:10:30.4 |
HIP 32959 |
16.96 |
| 2026-09-25 00:00 |
06:52:49.40 |
+26:11:06.5 |
HIP 32959 |
18.01 |
| 2026-09-25 12:00 |
06:52:59.54 |
+26:11:43.0 |
HIP 32959 |
19.27 |
| 2026-09-26 00:00 |
06:53:09.53 |
+26:12:19.7 |
HIP 32959 |
20.69 |
| 2026-09-26 12:00 |
06:53:19.37 |
+26:12:56.7 |
HIP 32959 |
22.23 |
| 2026-09-27 00:00 |
06:53:29.05 |
+26:13:34.0 |
HIP 33194 |
22.70 |
| 2026-09-27 12:00 |
06:53:38.58 |
+26:14:11.6 |
HIP 33194 |
20.97 |
| 2026-09-28 00:00 |
06:53:47.96 |
+26:14:49.4 |
HIP 33194 |
19.36 |
| 2026-09-28 12:00 |
06:53:57.18 |
+26:15:27.6 |
HIP 33194 |
17.88 |
| 2026-09-29 00:00 |
06:54:06.25 |
+26:16:06.0 |
HIP 33194 |
16.56 |
| 2026-09-29 12:00 |
06:54:15.16 |
+26:16:44.7 |
HIP 33194 |
15.42 |
| 2026-09-30 00:00 |
06:54:23.91 |
+26:17:23.7 |
HIP 33194 |
14.50 |
| 2026-09-30 12:00 |
06:54:32.51 |
+26:18:03.0 |
HIP 33194 |
13.81 |
| 2026-10-01 00:00 |
06:54:40.94 |
+26:18:42.6 |
HIP 33194 |
13.40 |
| 2026-10-01 12:00 |
06:54:49.22 |
+26:19:22.5 |
HIP 33194 |
13.25 |
| 2026-10-02 00:00 |
06:54:57.34 |
+26:20:02.7 |
HIP 33194 |
13.38 |
| 2026-10-02 12:00 |
06:55:05.29 |
+26:20:43.3 |
HIP 33194 |
13.75 |
| 2026-10-03 00:00 |
06:55:13.09 |
+26:21:24.1 |
HIP 33194 |
14.34 |
| 2026-10-03 12:00 |
06:55:20.72 |
+26:22:05.2 |
HIP 33194 |
15.11 |
| 2026-10-04 00:00 |
06:55:28.19 |
+26:22:46.6 |
HIP 33194 |
16.02 |
| 2026-10-04 12:00 |
06:55:35.49 |
+26:23:28.4 |
HIP 33194 |
17.04 |
| 2026-10-05 00:00 |
06:55:42.62 |
+26:24:10.4 |
HIP 33194 |
18.14 |
| 2026-10-05 12:00 |
06:55:49.59 |
+26:24:52.8 |
HIP 33194 |
19.30 |
| 2026-10-06 00:00 |
06:55:56.40 |
+26:25:35.5 |
HIP 33194 |
20.50 |
| 2026-10-06 12:00 |
06:56:03.03 |
+26:26:18.5 |
HIP 33194 |
21.72 |
| 2026-10-07 00:00 |
06:56:09.50 |
+26:27:01.8 |
HIP 33194 |
22.96 |
| 2026-10-07 12:00 |
06:56:15.80 |
+26:27:45.5 |
HIP 33506 |
22.71 |
| 2026-10-08 00:00 |
06:56:21.93 |
+26:28:29.4 |
HIP 33506 |
21.19 |
| 2026-10-08 12:00 |
06:56:27.88 |
+26:29:13.7 |
HIP 33506 |
19.71 |
| 2026-10-09 00:00 |
06:56:33.67 |
+26:29:58.4 |
HIP 33506 |
18.27 |
| 2026-10-09 12:00 |
06:56:39.28 |
+26:30:43.3 |
HIP 33506 |
16.89 |
| 2026-10-10 00:00 |
06:56:44.72 |
+26:31:28.6 |
HIP 33506 |
15.55 |
| 2026-10-10 12:00 |
06:56:49.99 |
+26:32:14.2 |
HIP 33506 |
14.27 |
| 2026-10-11 00:00 |
06:56:55.08 |
+26:33:00.1 |
HIP 33506 |
13.05 |