メタデータ
| 項目 |
値 |
| Designation |
P/2018 VN2 (Leonard) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-06-06T13:25:31.356480Z |
| Orbit solution date (soln_date, UTC) |
2026-09-21T07:12:11Z |
| Obs used |
239 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
19.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2022-03-06.0000000 |
| e |
0.47858960 |
| q (au) |
2.118118 |
| a (au) |
4.062285 |
| i (deg) |
18.247857 |
| Ω (om, deg) |
226.468699 |
| ω (w, deg) |
138.823235 |
| M (ma, deg) |
164.730662 |
等級
散乱 + 全体線形
$$
M_a = (14.818 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.818 |
| n |
2.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
02:05:17.88 |
+27:22:30.7 |
HIP 9608 |
24.18 |
| 2026-09-20 12:00 |
02:05:19.96 |
+27:19:14.5 |
HIP 9608 |
25.68 |
| 2026-09-21 00:00 |
02:05:21.61 |
+27:15:53.1 |
HIP 9623 |
24.85 |
| 2026-09-21 12:00 |
02:05:22.84 |
+27:12:26.7 |
HIP 9623 |
23.82 |
| 2026-09-22 00:00 |
02:05:23.64 |
+27:08:55.1 |
HIP 9623 |
23.16 |
| 2026-09-22 12:00 |
02:05:24.02 |
+27:05:18.5 |
HIP 9833 |
21.31 |
| 2026-09-23 00:00 |
02:05:23.98 |
+27:01:36.8 |
HIP 9833 |
18.89 |
| 2026-09-23 12:00 |
02:05:23.54 |
+26:57:50.1 |
HIP 9833 |
16.98 |
| 2026-09-24 00:00 |
02:05:22.68 |
+26:53:58.2 |
HIP 9833 |
15.84 |
| 2026-09-24 12:00 |
02:05:21.41 |
+26:50:01.2 |
HIP 9833 |
15.69 |
| 2026-09-25 00:00 |
02:05:19.74 |
+26:45:59.2 |
HIP 9833 |
16.62 |
| 2026-09-25 12:00 |
02:05:17.66 |
+26:41:52.1 |
HIP 9833 |
18.54 |
| 2026-09-26 00:00 |
02:05:15.19 |
+26:37:40.0 |
HIP 9833 |
21.22 |
| 2026-09-26 12:00 |
02:05:12.33 |
+26:33:22.7 |
HIP 9688 |
19.90 |
| 2026-09-27 00:00 |
02:05:09.08 |
+26:29:00.5 |
HIP 9688 |
15.63 |
| 2026-09-27 12:00 |
02:05:05.44 |
+26:24:33.2 |
HIP 9688 |
11.36 |
| 2026-09-28 00:00 |
02:05:01.42 |
+26:20:00.8 |
HIP 9688 |
7.29 |
| 2026-09-28 12:00 |
02:04:57.02 |
+26:15:23.5 |
HIP 9688 |
4.39 |
| 2026-09-29 00:00 |
02:04:52.24 |
+26:10:41.1 |
HIP 9688 |
5.49 |
| 2026-09-29 12:00 |
02:04:47.10 |
+26:05:53.8 |
HIP 9688 |
9.42 |
| 2026-09-30 00:00 |
02:04:41.59 |
+26:01:01.5 |
HIP 9669 |
7.41 |
| 2026-09-30 12:00 |
02:04:35.73 |
+25:56:04.2 |
HIP 9669 |
3.39 |
| 2026-10-01 00:00 |
02:04:29.51 |
+25:51:02.0 |
HIP 9669 |
4.58 |
| 2026-10-01 12:00 |
02:04:22.93 |
+25:45:54.9 |
HIP 9669 |
9.30 |
| 2026-10-02 00:00 |
02:04:16.02 |
+25:40:43.0 |
HIP 9669 |
14.54 |
| 2026-10-02 12:00 |
02:04:08.76 |
+25:35:26.1 |
HIP 9683 |
12.03 |
| 2026-10-03 00:00 |
02:04:01.17 |
+25:30:04.5 |
HIP 9683 |
9.11 |
| 2026-10-03 12:00 |
02:03:53.25 |
+25:24:38.1 |
HIP 9683 |
9.28 |
| 2026-10-04 00:00 |
02:03:45.01 |
+25:19:06.9 |
HIP 9609 |
7.60 |
| 2026-10-04 12:00 |
02:03:36.46 |
+25:13:31.0 |
HIP 9609 |
1.70 |
| 2026-10-05 00:00 |
02:03:27.60 |
+25:07:50.4 |
HIP 9609 |
4.35 |
| 2026-10-05 12:00 |
02:03:18.43 |
+25:02:05.1 |
HIP 9609 |
10.46 |
| 2026-10-06 00:00 |
02:03:08.97 |
+24:56:15.3 |
HIP 9609 |
16.67 |
| 2026-10-06 12:00 |
02:02:59.23 |
+24:50:20.9 |
HIP 9609 |
22.98 |
| 2026-10-07 00:00 |
02:02:49.20 |
+24:44:22.0 |
HIP 9435 |
28.61 |
| 2026-10-07 12:00 |
02:02:38.90 |
+24:38:18.7 |
HIP 9435 |
23.27 |
| 2026-10-08 00:00 |
02:02:28.33 |
+24:32:11.0 |
HIP 9435 |
18.59 |
| 2026-10-08 12:00 |
02:02:17.51 |
+24:25:58.9 |
HIP 9435 |
15.31 |
| 2026-10-09 00:00 |
02:02:06.44 |
+24:19:42.6 |
HIP 9435 |
14.55 |
| 2026-10-09 12:00 |
02:01:55.13 |
+24:13:22.1 |
HIP 9435 |
16.76 |
| 2026-10-10 00:00 |
02:01:43.59 |
+24:06:57.4 |
HIP 9435 |
21.12 |
| 2026-10-10 12:00 |
02:01:31.82 |
+24:00:28.7 |
HIP 9435 |
26.64 |
| 2026-10-11 00:00 |
02:01:19.84 |
+23:53:55.9 |
HIP 9452 |
30.36 |