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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
06:05:49.62 |
+15:02:49.5 |
HIP 28834 |
25.87 |
| 2026-06-03 00:00 |
06:05:55.02 |
+15:03:01.5 |
HIP 28834 |
26.19 |
| 2026-06-03 12:00 |
06:06:00.45 |
+15:03:13.3 |
HIP 28834 |
26.57 |
| 2026-06-04 00:00 |
06:06:05.88 |
+15:03:25.0 |
HIP 28834 |
27.02 |
| 2026-06-04 12:00 |
06:06:11.33 |
+15:03:36.6 |
HIP 29038 |
26.61 |
| 2026-06-05 00:00 |
06:06:16.78 |
+15:03:48.1 |
HIP 29038 |
25.76 |
| 2026-06-05 12:00 |
06:06:22.26 |
+15:03:59.5 |
HIP 29038 |
24.96 |
| 2026-06-06 00:00 |
06:06:27.74 |
+15:04:10.8 |
HIP 29038 |
24.19 |
| 2026-06-06 12:00 |
06:06:33.23 |
+15:04:22.0 |
HIP 29038 |
23.47 |
| 2026-06-07 00:00 |
06:06:38.74 |
+15:04:33.0 |
HIP 29038 |
22.81 |
| 2026-06-07 12:00 |
06:06:44.25 |
+15:04:44.0 |
HIP 29038 |
22.20 |
| 2026-06-08 00:00 |
06:06:49.78 |
+15:04:54.8 |
HIP 29038 |
21.66 |
| 2026-06-08 12:00 |
06:06:55.32 |
+15:05:05.5 |
HIP 29038 |
21.19 |
| 2026-06-09 00:00 |
06:07:00.87 |
+15:05:16.1 |
HIP 29038 |
20.79 |
| 2026-06-09 12:00 |
06:07:06.42 |
+15:05:26.6 |
HIP 29038 |
20.47 |
| 2026-06-10 00:00 |
06:07:11.99 |
+15:05:37.0 |
HIP 29038 |
20.24 |
| 2026-06-10 12:00 |
06:07:17.56 |
+15:05:47.2 |
HIP 29038 |
20.09 |
| 2026-06-11 00:00 |
06:07:23.15 |
+15:05:57.4 |
HIP 29038 |
20.03 |
| 2026-06-11 12:00 |
06:07:28.74 |
+15:06:07.4 |
HIP 29038 |
20.06 |
| 2026-06-12 00:00 |
06:07:34.34 |
+15:06:17.3 |
HIP 29038 |
20.18 |
| 2026-06-12 12:00 |
06:07:39.94 |
+15:06:27.1 |
HIP 29038 |
20.39 |
| 2026-06-13 00:00 |
06:07:45.56 |
+15:06:36.8 |
HIP 29038 |
20.68 |
| 2026-06-13 12:00 |
06:07:51.18 |
+15:06:46.3 |
HIP 29038 |
21.06 |
| 2026-06-14 00:00 |
06:07:56.80 |
+15:06:55.8 |
HIP 29038 |
21.52 |
| 2026-06-14 12:00 |
06:08:02.43 |
+15:07:05.1 |
HIP 29038 |
22.05 |
| 2026-06-15 00:00 |
06:08:08.07 |
+15:07:14.4 |
HIP 29038 |
22.65 |
| 2026-06-15 12:00 |
06:08:13.71 |
+15:07:23.5 |
HIP 29038 |
23.31 |
| 2026-06-16 00:00 |
06:08:19.36 |
+15:07:32.5 |
HIP 29038 |
24.03 |
| 2026-06-16 12:00 |
06:08:25.01 |
+15:07:41.4 |
HIP 29038 |
24.81 |
| 2026-06-17 00:00 |
06:08:30.67 |
+15:07:50.1 |
HIP 29038 |
25.64 |
| 2026-06-17 12:00 |
06:08:36.33 |
+15:07:58.8 |
HIP 29239 |
25.11 |
| 2026-06-18 00:00 |
06:08:41.99 |
+15:08:07.3 |
HIP 29239 |
24.21 |
| 2026-06-18 12:00 |
06:08:47.66 |
+15:08:15.8 |
HIP 29239 |
23.36 |
| 2026-06-19 00:00 |
06:08:53.32 |
+15:08:24.1 |
HIP 29239 |
22.55 |
| 2026-06-19 12:00 |
06:08:58.99 |
+15:08:32.3 |
HIP 29239 |
21.80 |
| 2026-06-20 00:00 |
06:09:04.67 |
+15:08:40.4 |
HIP 29239 |
21.12 |
| 2026-06-20 12:00 |
06:09:10.34 |
+15:08:48.4 |
HIP 29239 |
20.50 |
| 2026-06-21 00:00 |
06:09:16.01 |
+15:08:56.2 |
HIP 29239 |
19.95 |
| 2026-06-21 12:00 |
06:09:21.69 |
+15:09:04.0 |
HIP 29239 |
19.48 |
| 2026-06-22 00:00 |
06:09:27.36 |
+15:09:11.6 |
HIP 29239 |
19.11 |