メタデータ
| 項目 |
値 |
| Designation |
C/2016 M1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-08-10T04:14:19.821120Z |
| Orbit solution date (soln_date, UTC) |
2022-03-09T09:02:19Z |
| Obs used |
3553 |
| NEO |
- |
| M1 |
8.400 |
| K1 |
6.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-01-25.0000000 |
| e |
0.99907148 |
| q (au) |
2.210500 |
| a (au) |
2380.662751 |
| i (deg) |
90.993781 |
| Ω (om, deg) |
92.204019 |
| ω (w, deg) |
209.825799 |
| M (ma, deg) |
359.998327 |
等級
散乱 + 全体線形
$$
M_a = (6.650 + 3.587\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.650 |
| n |
3.587 |
| gf |
1.000 |
| gb |
-0.868 |
| k |
0.997 |
| 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 |
| 2016-04-11 |
2017-08-24 |
-0.4988 |
+0.462 |
| 2017-08-24 |
2018-08-10 |
+3.5426 |
-2.264 |
| 2018-08-10 |
2022-03-01 |
+3.6685 |
-3.220 |
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) |
| 2026-05-12 00:00 |
06:02:14.57 |
+14:52:30.9 |
HIP 28473 |
23.09 |
| 2026-05-12 12:00 |
06:02:19.07 |
+14:52:47.5 |
HIP 28473 |
24.10 |
| 2026-05-13 00:00 |
06:02:23.61 |
+14:53:04.1 |
HIP 28473 |
25.12 |
| 2026-05-13 12:00 |
06:02:28.18 |
+14:53:20.5 |
HIP 28473 |
26.17 |
| 2026-05-14 00:00 |
06:02:32.77 |
+14:53:36.8 |
HIP 28473 |
27.22 |
| 2026-05-14 12:00 |
06:02:37.39 |
+14:53:53.1 |
HIP 28473 |
28.29 |
| 2026-05-15 00:00 |
06:02:42.03 |
+14:54:09.2 |
HIP 28473 |
29.38 |
| 2026-05-15 12:00 |
06:02:46.71 |
+14:54:25.2 |
HIP 28473 |
30.47 |
| 2026-05-16 00:00 |
06:02:51.41 |
+14:54:41.2 |
HIP 28473 |
31.58 |
| 2026-05-16 12:00 |
06:02:56.13 |
+14:54:57.0 |
HIP 28473 |
32.69 |
| 2026-05-17 00:00 |
06:03:00.88 |
+14:55:12.7 |
HIP 28663 |
33.35 |
| 2026-05-17 12:00 |
06:03:05.66 |
+14:55:28.3 |
HIP 28663 |
33.56 |
| 2026-05-18 00:00 |
06:03:10.46 |
+14:55:43.8 |
HIP 28663 |
33.82 |
| 2026-05-18 12:00 |
06:03:15.28 |
+14:55:59.1 |
HIP 28663 |
34.11 |
| 2026-05-19 00:00 |
06:03:20.13 |
+14:56:14.4 |
HIP 28663 |
34.44 |
| 2026-05-19 12:00 |
06:03:25.01 |
+14:56:29.6 |
HIP 28663 |
34.80 |
| 2026-05-20 00:00 |
06:03:29.90 |
+14:56:44.6 |
HIP 28663 |
35.21 |
| 2026-05-20 12:00 |
06:03:34.82 |
+14:56:59.6 |
HIP 28663 |
35.64 |
| 2026-05-21 00:00 |
06:03:39.76 |
+14:57:14.4 |
HIP 28663 |
36.12 |
| 2026-05-21 12:00 |
06:03:44.73 |
+14:57:29.2 |
HIP 28834 |
36.05 |
| 2026-05-22 00:00 |
06:03:49.71 |
+14:57:43.8 |
HIP 28834 |
35.16 |
| 2026-05-22 12:00 |
06:03:54.72 |
+14:57:58.3 |
HIP 28834 |
34.30 |
| 2026-05-23 00:00 |
06:03:59.75 |
+14:58:12.7 |
HIP 28834 |
33.46 |
| 2026-05-23 12:00 |
06:04:04.80 |
+14:58:27.0 |
HIP 28834 |
32.65 |
| 2026-05-24 00:00 |
06:04:09.87 |
+14:58:41.2 |
HIP 28834 |
31.86 |
| 2026-05-24 12:00 |
06:04:14.96 |
+14:58:55.2 |
HIP 28834 |
31.10 |
| 2026-05-25 00:00 |
06:04:20.07 |
+14:59:09.2 |
HIP 28834 |
30.37 |
| 2026-05-25 12:00 |
06:04:25.20 |
+14:59:23.0 |
HIP 28834 |
29.68 |
| 2026-05-26 00:00 |
06:04:30.35 |
+14:59:36.8 |
HIP 28834 |
29.03 |
| 2026-05-26 12:00 |
06:04:35.51 |
+14:59:50.4 |
HIP 28834 |
28.41 |
| 2026-05-27 00:00 |
06:04:40.70 |
+15:00:03.9 |
HIP 28834 |
27.85 |
| 2026-05-27 12:00 |
06:04:45.90 |
+15:00:17.3 |
HIP 28834 |
27.33 |
| 2026-05-28 00:00 |
06:04:51.12 |
+15:00:30.6 |
HIP 28834 |
26.86 |
| 2026-05-28 12:00 |
06:04:56.36 |
+15:00:43.8 |
HIP 28834 |
26.45 |
| 2026-05-29 00:00 |
06:05:01.61 |
+15:00:56.9 |
HIP 28834 |
26.09 |
| 2026-05-29 12:00 |
06:05:06.88 |
+15:01:09.8 |
HIP 28834 |
25.80 |
| 2026-05-30 00:00 |
06:05:12.17 |
+15:01:22.7 |
HIP 28834 |
25.57 |
| 2026-05-30 12:00 |
06:05:17.48 |
+15:01:35.4 |
HIP 28834 |
25.41 |
| 2026-05-31 00:00 |
06:05:22.80 |
+15:01:48.1 |
HIP 28834 |
25.31 |
| 2026-05-31 12:00 |
06:05:28.13 |
+15:02:00.6 |
HIP 28834 |
25.28 |
| 2026-06-01 00:00 |
06:05:33.48 |
+15:02:13.0 |
HIP 28834 |
25.33 |
| 2026-06-01 12:00 |
06:05:38.85 |
+15:02:25.3 |
HIP 28834 |
25.44 |
| 2026-06-02 00:00 |
06:05:44.22 |
+15:02:37.4 |
HIP 28834 |
25.62 |