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) |
| 2026-06-01 00:00 |
05:32:47.89 |
+24:10:18.9 |
HIP 26062 |
29.10 |
| 2026-06-01 12:00 |
05:33:12.52 |
+24:11:06.4 |
HIP 26201 |
26.10 |
| 2026-06-02 00:00 |
05:33:37.18 |
+24:11:53.6 |
HIP 26201 |
20.46 |
| 2026-06-02 12:00 |
05:34:01.85 |
+24:12:40.6 |
HIP 26201 |
14.85 |
| 2026-06-03 00:00 |
05:34:26.54 |
+24:13:27.3 |
HIP 26201 |
9.34 |
| 2026-06-03 12:00 |
05:34:51.25 |
+24:14:13.8 |
HIP 26201 |
4.27 |
| 2026-06-04 00:00 |
05:35:15.97 |
+24:15:00.1 |
HIP 26201 |
3.74 |
| 2026-06-04 12:00 |
05:35:40.71 |
+24:15:46.1 |
HIP 26201 |
8.63 |
| 2026-06-05 00:00 |
05:36:05.46 |
+24:16:31.9 |
HIP 26201 |
14.14 |
| 2026-06-05 12:00 |
05:36:30.23 |
+24:17:17.5 |
HIP 26201 |
19.75 |
| 2026-06-06 00:00 |
05:36:55.01 |
+24:18:02.8 |
HIP 26201 |
25.40 |
| 2026-06-06 12:00 |
05:37:19.80 |
+24:18:47.9 |
HIP 26248 |
30.50 |
| 2026-06-07 00:00 |
05:37:44.61 |
+24:19:32.8 |
HIP 26651 |
29.54 |
| 2026-06-07 12:00 |
05:38:09.43 |
+24:20:17.4 |
HIP 26651 |
24.22 |
| 2026-06-08 00:00 |
05:38:34.25 |
+24:21:01.8 |
HIP 26651 |
19.14 |
| 2026-06-08 12:00 |
05:38:59.09 |
+24:21:45.9 |
HIP 26651 |
14.51 |
| 2026-06-09 00:00 |
05:39:23.94 |
+24:22:29.8 |
HIP 26651 |
10.95 |
| 2026-06-09 12:00 |
05:39:48.80 |
+24:23:13.5 |
HIP 26651 |
9.72 |
| 2026-06-10 00:00 |
05:40:13.66 |
+24:23:57.0 |
HIP 26691 |
8.37 |
| 2026-06-10 12:00 |
05:40:38.53 |
+24:24:40.2 |
HIP 26761 |
7.14 |
| 2026-06-11 00:00 |
05:41:03.41 |
+24:25:23.2 |
HIP 26761 |
4.40 |
| 2026-06-11 12:00 |
05:41:28.30 |
+24:26:05.9 |
HIP 26761 |
7.27 |
| 2026-06-12 00:00 |
05:41:53.19 |
+24:26:48.4 |
HIP 26839 |
7.75 |
| 2026-06-12 12:00 |
05:42:18.09 |
+24:27:30.7 |
HIP 26839 |
9.65 |
| 2026-06-13 00:00 |
05:42:42.99 |
+24:28:12.7 |
HIP 26839 |
13.84 |
| 2026-06-13 12:00 |
05:43:07.89 |
+24:28:54.5 |
HIP 26839 |
18.85 |
| 2026-06-14 00:00 |
05:43:32.80 |
+24:29:36.1 |
HIP 27135 |
23.38 |
| 2026-06-14 12:00 |
05:43:57.71 |
+24:30:17.4 |
HIP 27135 |
18.03 |
| 2026-06-15 00:00 |
05:44:22.62 |
+24:30:58.5 |
HIP 27135 |
12.98 |
| 2026-06-15 12:00 |
05:44:47.53 |
+24:31:39.4 |
HIP 27135 |
8.78 |
| 2026-06-16 00:00 |
05:45:12.44 |
+24:32:20.1 |
HIP 27135 |
7.13 |
| 2026-06-16 12:00 |
05:45:37.34 |
+24:33:00.5 |
HIP 27135 |
9.47 |
| 2026-06-17 00:00 |
05:46:02.25 |
+24:33:40.6 |
HIP 27135 |
13.91 |
| 2026-06-17 12:00 |
05:46:27.15 |
+24:34:20.6 |
HIP 27135 |
19.04 |
| 2026-06-18 00:00 |
05:46:52.05 |
+24:35:00.3 |
HIP 27382 |
15.66 |
| 2026-06-18 12:00 |
05:47:16.94 |
+24:35:39.8 |
HIP 27382 |
10.12 |
| 2026-06-19 00:00 |
05:47:41.83 |
+24:36:19.1 |
HIP 27382 |
4.95 |
| 2026-06-19 12:00 |
05:48:06.71 |
+24:36:58.1 |
HIP 27382 |
3.40 |
| 2026-06-20 00:00 |
05:48:31.59 |
+24:37:37.0 |
HIP 27468 |
7.57 |
| 2026-06-20 12:00 |
05:48:56.46 |
+24:38:15.6 |
HIP 27468 |
4.33 |
| 2026-06-21 00:00 |
05:49:21.32 |
+24:38:53.9 |
HIP 27468 |
6.70 |
| 2026-06-21 12:00 |
05:49:46.17 |
+24:39:32.1 |
HIP 27468 |
11.65 |
| 2026-06-22 00:00 |
05:50:11.01 |
+24:40:10.0 |
HIP 27468 |
17.05 |