P/2023 M2 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
04:33:08.76 |
+20:10:21.3 |
HIP 21240 |
21.79 |
| 2026-02-03 12:00 |
04:33:06.83 |
+20:11:13.1 |
HIP 21314 |
22.12 |
| 2026-02-04 00:00 |
04:33:05.10 |
+20:12:05.2 |
HIP 21314 |
22.19 |
| 2026-02-04 12:00 |
04:33:03.56 |
+20:12:57.5 |
HIP 21314 |
22.26 |
| 2026-02-05 00:00 |
04:33:02.23 |
+20:13:50.2 |
HIP 21314 |
22.32 |
| 2026-02-05 12:00 |
04:33:01.10 |
+20:14:43.0 |
HIP 21314 |
22.37 |
| 2026-02-06 00:00 |
04:33:00.16 |
+20:15:36.2 |
HIP 21314 |
22.41 |
| 2026-02-06 12:00 |
04:32:59.43 |
+20:16:29.6 |
HIP 21314 |
22.44 |
| 2026-02-07 00:00 |
04:32:58.89 |
+20:17:23.3 |
HIP 21314 |
22.47 |
| 2026-02-07 12:00 |
04:32:58.55 |
+20:18:17.2 |
HIP 21314 |
22.48 |
| 2026-02-08 00:00 |
04:32:58.40 |
+20:19:11.4 |
HIP 21314 |
22.48 |
| 2026-02-08 12:00 |
04:32:58.46 |
+20:20:05.9 |
HIP 21314 |
22.47 |
| 2026-02-09 00:00 |
04:32:58.71 |
+20:21:00.6 |
HIP 21314 |
22.46 |
| 2026-02-09 12:00 |
04:32:59.16 |
+20:21:55.5 |
HIP 21314 |
22.43 |
| 2026-02-10 00:00 |
04:32:59.80 |
+20:22:50.7 |
HIP 21314 |
22.40 |
| 2026-02-10 12:00 |
04:33:00.64 |
+20:23:46.2 |
HIP 21314 |
22.36 |
| 2026-02-11 00:00 |
04:33:01.68 |
+20:24:41.9 |
HIP 21314 |
22.32 |
| 2026-02-11 12:00 |
04:33:02.91 |
+20:25:37.9 |
HIP 21314 |
22.28 |
| 2026-02-12 00:00 |
04:33:04.34 |
+20:26:34.1 |
HIP 21314 |
22.23 |
| 2026-02-12 12:00 |
04:33:05.97 |
+20:27:30.6 |
HIP 21314 |
22.19 |
| 2026-02-13 00:00 |
04:33:07.79 |
+20:28:27.3 |
HIP 21314 |
22.16 |
| 2026-02-13 12:00 |
04:33:09.80 |
+20:29:24.2 |
HIP 21314 |
22.14 |
| 2026-02-14 00:00 |
04:33:12.01 |
+20:30:21.4 |
HIP 21314 |
22.13 |
| 2026-02-14 12:00 |
04:33:14.41 |
+20:31:18.9 |
HIP 21314 |
22.13 |
| 2026-02-15 00:00 |
04:33:17.00 |
+20:32:16.5 |
HIP 21314 |
22.16 |
| 2026-02-15 12:00 |
04:33:19.79 |
+20:33:14.5 |
HIP 21314 |
22.22 |
| 2026-02-16 00:00 |
04:33:22.76 |
+20:34:12.6 |
HIP 21314 |
22.30 |
| 2026-02-16 12:00 |
04:33:25.93 |
+20:35:11.0 |
HIP 21314 |
22.41 |
| 2026-02-17 00:00 |
04:33:29.30 |
+20:36:09.6 |
HIP 21314 |
22.57 |
| 2026-02-17 12:00 |
04:33:32.85 |
+20:37:08.4 |
HIP 21314 |
22.77 |
| 2026-02-18 00:00 |
04:33:36.59 |
+20:38:07.4 |
HIP 21314 |
23.01 |
| 2026-02-18 12:00 |
04:33:40.52 |
+20:39:06.7 |
HIP 21314 |
23.31 |
| 2026-02-19 00:00 |
04:33:44.64 |
+20:40:06.2 |
HIP 21314 |
23.66 |
| 2026-02-19 12:00 |
04:33:48.95 |
+20:41:05.9 |
HIP 21314 |
24.07 |
| 2026-02-20 00:00 |
04:33:53.44 |
+20:42:05.8 |
HIP 21314 |
24.54 |
| 2026-02-20 12:00 |
04:33:58.13 |
+20:43:06.0 |
HIP 21318 |
24.83 |
| 2026-02-21 00:00 |
04:34:02.99 |
+20:44:06.3 |
HIP 21318 |
23.50 |
| 2026-02-21 12:00 |
04:34:08.05 |
+20:45:06.8 |
HIP 21318 |
22.17 |
| 2026-02-22 00:00 |
04:34:13.28 |
+20:46:07.6 |
HIP 21318 |
20.87 |
| 2026-02-22 12:00 |
04:34:18.71 |
+20:47:08.5 |
HIP 21318 |
19.60 |
| 2026-02-23 00:00 |
04:34:24.31 |
+20:48:09.7 |
HIP 21318 |
18.37 |
| 2026-02-23 12:00 |
04:34:30.10 |
+20:49:11.0 |
HIP 21318 |
17.21 |
| 2026-02-24 00:00 |
04:34:36.06 |
+20:50:12.5 |
HIP 21318 |
16.14 |