6P/d'Arrest
メタデータ
| 項目 |
値 |
| Designation |
6P/d’Arrest |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-09-17T18:56:35.044800Z |
| Orbit solution date (soln_date, UTC) |
2022-11-23T09:15:27Z |
| Obs used |
1093 |
| NEO |
- |
| M1 |
15.900 |
| K1 |
8.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-03-29.0000000 |
| e |
0.61267012 |
| q (au) |
1.354585 |
| a (au) |
3.497239 |
| i (deg) |
19.512431 |
| Ω (om, deg) |
138.937100 |
| ω (w, deg) |
178.106460 |
| M (ma, deg) |
333.960485 |
等級
散乱 + 全体線形
$$
M_a = (14.690 + 3.915\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.690 |
| n |
3.915 |
| 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 |
| 2021-03-10 |
2021-07-17 |
-7.6930 |
+2.374 |
| 2021-07-17 |
2021-09-17 |
+39.7603 |
-6.394 |
| 2021-09-18 |
2022-04-02 |
-14.7809 |
-1.960 |
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 |
11:00:13.54 |
+14:03:59.1 |
HIP 53649 |
31.46 |
| 2026-02-03 12:00 |
10:59:58.88 |
+14:06:35.9 |
HIP 53649 |
27.06 |
| 2026-02-04 00:00 |
10:59:44.08 |
+14:09:13.2 |
HIP 53649 |
22.63 |
| 2026-02-04 12:00 |
10:59:29.12 |
+14:11:51.0 |
HIP 53649 |
18.18 |
| 2026-02-05 00:00 |
10:59:14.02 |
+14:14:29.4 |
HIP 53649 |
13.71 |
| 2026-02-05 12:00 |
10:58:58.76 |
+14:17:08.2 |
HIP 53649 |
9.26 |
| 2026-02-06 00:00 |
10:58:43.36 |
+14:19:47.6 |
HIP 53649 |
4.96 |
| 2026-02-06 12:00 |
10:58:27.82 |
+14:22:27.4 |
HIP 53649 |
2.34 |
| 2026-02-07 00:00 |
10:58:12.13 |
+14:25:07.7 |
HIP 53598 |
4.70 |
| 2026-02-07 12:00 |
10:57:56.30 |
+14:27:48.3 |
HIP 53598 |
0.12 |
| 2026-02-08 00:00 |
10:57:40.34 |
+14:30:29.4 |
HIP 53598 |
4.69 |
| 2026-02-08 12:00 |
10:57:24.24 |
+14:33:10.9 |
HIP 53598 |
9.42 |
| 2026-02-09 00:00 |
10:57:08.00 |
+14:35:52.7 |
HIP 53598 |
14.18 |
| 2026-02-09 12:00 |
10:56:51.64 |
+14:38:34.9 |
HIP 53598 |
18.98 |
| 2026-02-10 00:00 |
10:56:35.14 |
+14:41:17.3 |
HIP 53598 |
23.80 |
| 2026-02-10 12:00 |
10:56:18.52 |
+14:44:00.1 |
HIP 53598 |
28.65 |
| 2026-02-11 00:00 |
10:56:01.77 |
+14:46:43.1 |
HIP 53366 |
31.05 |
| 2026-02-11 12:00 |
10:55:44.90 |
+14:49:26.4 |
HIP 53366 |
26.51 |
| 2026-02-12 00:00 |
10:55:27.91 |
+14:52:09.8 |
HIP 53366 |
22.10 |
| 2026-02-12 12:00 |
10:55:10.81 |
+14:54:53.5 |
HIP 53366 |
17.95 |
| 2026-02-13 00:00 |
10:54:53.58 |
+14:57:37.4 |
HIP 53366 |
14.31 |
| 2026-02-13 12:00 |
10:54:36.25 |
+15:00:21.4 |
HIP 53366 |
11.70 |
| 2026-02-14 00:00 |
10:54:18.81 |
+15:03:05.5 |
HIP 53366 |
10.92 |
| 2026-02-14 12:00 |
10:54:01.26 |
+15:05:49.8 |
HIP 53366 |
12.35 |
| 2026-02-15 00:00 |
10:53:43.61 |
+15:08:34.1 |
HIP 53366 |
15.41 |
| 2026-02-15 12:00 |
10:53:25.85 |
+15:11:18.5 |
HIP 53366 |
19.35 |
| 2026-02-16 00:00 |
10:53:08.00 |
+15:14:02.8 |
HIP 53366 |
23.75 |
| 2026-02-16 12:00 |
10:52:50.05 |
+15:16:47.2 |
HIP 53366 |
28.41 |
| 2026-02-17 00:00 |
10:52:32.01 |
+15:19:31.6 |
HIP 53366 |
33.23 |
| 2026-02-17 12:00 |
10:52:13.88 |
+15:22:16.0 |
HIP 53366 |
38.15 |
| 2026-02-18 00:00 |
10:51:55.66 |
+15:25:00.2 |
HIP 53031 |
40.34 |
| 2026-02-18 12:00 |
10:51:37.36 |
+15:27:44.4 |
HIP 53031 |
36.50 |
| 2026-02-19 00:00 |
10:51:18.98 |
+15:30:28.4 |
HIP 53031 |
33.01 |
| 2026-02-19 12:00 |
10:51:00.52 |
+15:33:12.3 |
HIP 53031 |
30.04 |
| 2026-02-20 00:00 |
10:50:41.98 |
+15:35:56.0 |
HIP 52918 |
25.45 |
| 2026-02-20 12:00 |
10:50:23.38 |
+15:38:39.6 |
HIP 52918 |
20.30 |
| 2026-02-21 00:00 |
10:50:04.70 |
+15:41:22.9 |
HIP 52918 |
15.21 |
| 2026-02-21 12:00 |
10:49:45.96 |
+15:44:05.9 |
HIP 52918 |
10.27 |
| 2026-02-22 00:00 |
10:49:27.16 |
+15:46:48.7 |
HIP 52918 |
5.94 |
| 2026-02-22 12:00 |
10:49:08.30 |
+15:49:31.2 |
HIP 52918 |
4.57 |
| 2026-02-23 00:00 |
10:48:49.39 |
+15:52:13.4 |
HIP 52918 |
7.90 |
| 2026-02-23 12:00 |
10:48:30.42 |
+15:54:55.2 |
HIP 52918 |
12.66 |
| 2026-02-24 00:00 |
10:48:11.40 |
+15:57:36.7 |
HIP 52918 |
17.73 |