メタデータ
| 項目 |
値 |
| Designation |
C/2017 W2 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-11-01T22:30:18.835200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:38Z |
| Obs used |
169 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-12-26.0000000 |
| e |
0.71125672 |
| q (au) |
3.957327 |
| a (au) |
13.705348 |
| i (deg) |
98.179291 |
| Ω (om, deg) |
312.809062 |
| ω (w, deg) |
169.157714 |
| M (ma, deg) |
1.050179 |
等級
散乱 + 全体線形
$$
M_a = (10.278 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.278 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.700 |
| k |
0.800 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
23:47:19.84 |
-56:00:23.5 |
HIP 117276 |
12.49 |
| 2026-06-01 12:00 |
23:47:21.44 |
-56:01:34.1 |
HIP 117276 |
13.67 |
| 2026-06-02 00:00 |
23:47:22.94 |
-56:02:45.1 |
HIP 117276 |
14.86 |
| 2026-06-02 12:00 |
23:47:24.34 |
-56:03:56.5 |
HIP 117276 |
16.06 |
| 2026-06-03 00:00 |
23:47:25.63 |
-56:05:08.4 |
HIP 117276 |
17.26 |
| 2026-06-03 12:00 |
23:47:26.83 |
-56:06:20.8 |
HIP 117276 |
18.46 |
| 2026-06-04 00:00 |
23:47:27.93 |
-56:07:33.6 |
HIP 117276 |
19.67 |
| 2026-06-04 12:00 |
23:47:28.93 |
-56:08:46.9 |
HIP 117276 |
20.89 |
| 2026-06-05 00:00 |
23:47:29.83 |
-56:10:00.5 |
HIP 117521 |
22.01 |
| 2026-06-05 12:00 |
23:47:30.62 |
-56:11:14.7 |
HIP 117521 |
21.56 |
| 2026-06-06 00:00 |
23:47:31.31 |
-56:12:29.2 |
HIP 117521 |
21.18 |
| 2026-06-06 12:00 |
23:47:31.90 |
-56:13:44.1 |
HIP 117521 |
20.89 |
| 2026-06-07 00:00 |
23:47:32.38 |
-56:14:59.5 |
HIP 117508 |
20.33 |
| 2026-06-07 12:00 |
23:47:32.76 |
-56:16:15.3 |
HIP 117508 |
19.78 |
| 2026-06-08 00:00 |
23:47:33.04 |
-56:17:31.4 |
HIP 117508 |
19.31 |
| 2026-06-08 12:00 |
23:47:33.21 |
-56:18:48.0 |
HIP 117508 |
18.93 |
| 2026-06-09 00:00 |
23:47:33.28 |
-56:20:05.0 |
HIP 117508 |
18.64 |
| 2026-06-09 12:00 |
23:47:33.24 |
-56:21:22.3 |
HIP 117508 |
18.45 |
| 2026-06-10 00:00 |
23:47:33.09 |
-56:22:40.0 |
HIP 117508 |
18.36 |
| 2026-06-10 12:00 |
23:47:32.84 |
-56:23:58.1 |
HIP 117508 |
18.38 |
| 2026-06-11 00:00 |
23:47:32.48 |
-56:25:16.6 |
HIP 117508 |
18.51 |
| 2026-06-11 12:00 |
23:47:32.02 |
-56:26:35.4 |
HIP 117508 |
18.74 |
| 2026-06-12 00:00 |
23:47:31.44 |
-56:27:54.5 |
HIP 117508 |
19.07 |
| 2026-06-12 12:00 |
23:47:30.76 |
-56:29:14.0 |
HIP 117508 |
19.51 |
| 2026-06-13 00:00 |
23:47:29.97 |
-56:30:33.9 |
HIP 117160 |
19.68 |
| 2026-06-13 12:00 |
23:47:29.07 |
-56:31:54.0 |
HIP 117160 |
19.81 |
| 2026-06-14 00:00 |
23:47:28.06 |
-56:33:14.5 |
HIP 117160 |
20.02 |
| 2026-06-14 12:00 |
23:47:26.94 |
-56:34:35.4 |
HIP 117160 |
20.31 |
| 2026-06-15 00:00 |
23:47:25.71 |
-56:35:56.5 |
HIP 117160 |
20.67 |
| 2026-06-15 12:00 |
23:47:24.36 |
-56:37:17.9 |
HIP 117160 |
21.10 |
| 2026-06-16 00:00 |
23:47:22.91 |
-56:38:39.6 |
HIP 117160 |
21.59 |
| 2026-06-16 12:00 |
23:47:21.35 |
-56:40:01.6 |
HIP 117322 |
21.40 |
| 2026-06-17 00:00 |
23:47:19.67 |
-56:41:23.9 |
HIP 117322 |
20.03 |
| 2026-06-17 12:00 |
23:47:17.89 |
-56:42:46.5 |
HIP 117322 |
18.66 |
| 2026-06-18 00:00 |
23:47:15.99 |
-56:44:09.3 |
HIP 117322 |
17.29 |
| 2026-06-18 12:00 |
23:47:13.98 |
-56:45:32.4 |
HIP 117322 |
15.93 |
| 2026-06-19 00:00 |
23:47:11.86 |
-56:46:55.7 |
HIP 117322 |
14.57 |
| 2026-06-19 12:00 |
23:47:09.62 |
-56:48:19.2 |
HIP 117322 |
13.22 |
| 2026-06-20 00:00 |
23:47:07.27 |
-56:49:43.0 |
HIP 117322 |
11.89 |
| 2026-06-20 12:00 |
23:47:04.81 |
-56:51:07.0 |
HIP 117322 |
10.59 |
| 2026-06-21 00:00 |
23:47:02.24 |
-56:52:31.3 |
HIP 117322 |
9.32 |
| 2026-06-21 12:00 |
23:46:59.55 |
-56:53:55.7 |
HIP 117322 |
8.12 |
| 2026-06-22 00:00 |
23:46:56.75 |
-56:55:20.3 |
HIP 117322 |
7.02 |