メタデータ
| 項目 |
値 |
| Designation |
C/2017 D3 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-04-26T17:48:37.664640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:30Z |
| Obs used |
523 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-10-06.0000000 |
| e |
1.00243639 |
| q (au) |
4.971286 |
| a (au) |
-2040.429612 |
| i (deg) |
125.570039 |
| Ω (om, deg) |
186.618173 |
| ω (w, deg) |
340.767499 |
| M (ma, deg) |
0.001735 |
等級
散乱 + 全体線形
$$
M_a = (10.067 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.067 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.999 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
03:47:55.82 |
+72:29:13.4 |
HIP 18000 |
13.42 |
| 2026-05-12 12:00 |
03:48:11.34 |
+72:29:07.3 |
HIP 18000 |
12.28 |
| 2026-05-13 00:00 |
03:48:26.88 |
+72:29:01.6 |
HIP 18000 |
11.14 |
| 2026-05-13 12:00 |
03:48:42.42 |
+72:28:56.4 |
HIP 18000 |
10.01 |
| 2026-05-14 00:00 |
03:48:57.98 |
+72:28:51.7 |
HIP 18000 |
8.89 |
| 2026-05-14 12:00 |
03:49:13.54 |
+72:28:47.6 |
HIP 18000 |
7.77 |
| 2026-05-15 00:00 |
03:49:29.12 |
+72:28:43.9 |
HIP 18000 |
6.67 |
| 2026-05-15 12:00 |
03:49:44.70 |
+72:28:40.7 |
HIP 18000 |
5.60 |
| 2026-05-16 00:00 |
03:50:00.29 |
+72:28:38.0 |
HIP 18000 |
4.57 |
| 2026-05-16 12:00 |
03:50:15.88 |
+72:28:35.8 |
HIP 18000 |
3.63 |
| 2026-05-17 00:00 |
03:50:31.48 |
+72:28:34.1 |
HIP 18000 |
2.85 |
| 2026-05-17 12:00 |
03:50:47.08 |
+72:28:32.8 |
HIP 18000 |
2.41 |
| 2026-05-18 00:00 |
03:51:02.69 |
+72:28:32.1 |
HIP 18000 |
2.49 |
| 2026-05-18 12:00 |
03:51:18.30 |
+72:28:31.8 |
HIP 18000 |
3.05 |
| 2026-05-19 00:00 |
03:51:33.90 |
+72:28:32.1 |
HIP 18000 |
3.89 |
| 2026-05-19 12:00 |
03:51:49.51 |
+72:28:32.8 |
HIP 18000 |
4.87 |
| 2026-05-20 00:00 |
03:52:05.12 |
+72:28:34.0 |
HIP 18000 |
5.91 |
| 2026-05-20 12:00 |
03:52:20.73 |
+72:28:35.7 |
HIP 18000 |
7.00 |
| 2026-05-21 00:00 |
03:52:36.33 |
+72:28:37.9 |
HIP 18000 |
8.10 |
| 2026-05-21 12:00 |
03:52:51.93 |
+72:28:40.5 |
HIP 18000 |
9.22 |
| 2026-05-22 00:00 |
03:53:07.53 |
+72:28:43.6 |
HIP 18000 |
10.35 |
| 2026-05-22 12:00 |
03:53:23.12 |
+72:28:47.2 |
HIP 18000 |
11.49 |
| 2026-05-23 00:00 |
03:53:38.70 |
+72:28:51.3 |
HIP 18000 |
12.63 |
| 2026-05-23 12:00 |
03:53:54.28 |
+72:28:55.9 |
HIP 18000 |
13.78 |
| 2026-05-24 00:00 |
03:54:09.85 |
+72:29:00.9 |
HIP 18000 |
14.92 |
| 2026-05-24 12:00 |
03:54:25.41 |
+72:29:06.4 |
HIP 18000 |
16.07 |
| 2026-05-25 00:00 |
03:54:40.97 |
+72:29:12.4 |
HIP 18000 |
17.22 |
| 2026-05-25 12:00 |
03:54:56.51 |
+72:29:18.8 |
HIP 18000 |
18.38 |
| 2026-05-26 00:00 |
03:55:12.04 |
+72:29:25.7 |
HIP 18545 |
18.97 |
| 2026-05-26 12:00 |
03:55:27.56 |
+72:29:33.1 |
HIP 18545 |
18.12 |
| 2026-05-27 00:00 |
03:55:43.07 |
+72:29:40.9 |
HIP 18545 |
17.29 |
| 2026-05-27 12:00 |
03:55:58.56 |
+72:29:49.2 |
HIP 18545 |
16.51 |
| 2026-05-28 00:00 |
03:56:14.04 |
+72:29:58.0 |
HIP 18545 |
15.76 |
| 2026-05-28 12:00 |
03:56:29.51 |
+72:30:07.2 |
HIP 18545 |
15.06 |
| 2026-05-29 00:00 |
03:56:44.96 |
+72:30:16.9 |
HIP 18545 |
14.41 |
| 2026-05-29 12:00 |
03:57:00.40 |
+72:30:27.0 |
HIP 18545 |
13.83 |
| 2026-05-30 00:00 |
03:57:15.81 |
+72:30:37.6 |
HIP 18545 |
13.32 |
| 2026-05-30 12:00 |
03:57:31.21 |
+72:30:48.7 |
HIP 18545 |
12.88 |
| 2026-05-31 00:00 |
03:57:46.60 |
+72:31:00.2 |
HIP 18545 |
12.53 |
| 2026-05-31 12:00 |
03:58:01.96 |
+72:31:12.2 |
HIP 18545 |
12.27 |
| 2026-06-01 00:00 |
03:58:17.30 |
+72:31:24.6 |
HIP 18545 |
12.11 |
| 2026-06-01 12:00 |
03:58:32.63 |
+72:31:37.4 |
HIP 18545 |
12.06 |
| 2026-06-02 00:00 |
03:58:47.93 |
+72:31:50.8 |
HIP 18545 |
12.11 |