メタデータ
| 項目 |
値 |
| Designation |
46P/Wirtanen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-12-12T22:20:53.010240Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T09:51:41Z |
| Obs used |
4224 |
| NEO |
Yes |
| M1 |
16.600 |
| K1 |
4.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-12-13.0000000 |
| e |
0.65875501 |
| q (au) |
1.055355 |
| a (au) |
3.092662 |
| i (deg) |
11.747549 |
| Ω (om, deg) |
82.157634 |
| ω (w, deg) |
356.341072 |
| M (ma, deg) |
0.012474 |
等級
散乱 + 全体線形
$$
M_a = (15.091 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.091 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.838 |
| 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) |
| 2026-05-12 00:00 |
16:30:19.36 |
-17:23:24.2 |
HIP 80711 |
23.21 |
| 2026-05-12 12:00 |
16:29:57.71 |
-17:22:51.4 |
HIP 80711 |
18.38 |
| 2026-05-13 00:00 |
16:29:35.96 |
-17:22:18.5 |
HIP 80711 |
13.80 |
| 2026-05-13 12:00 |
16:29:14.12 |
-17:21:45.6 |
HIP 80711 |
9.86 |
| 2026-05-14 00:00 |
16:28:52.19 |
-17:21:12.6 |
HIP 80711 |
7.66 |
| 2026-05-14 12:00 |
16:28:30.18 |
-17:20:39.6 |
HIP 80711 |
8.70 |
| 2026-05-15 00:00 |
16:28:08.08 |
-17:20:06.5 |
HIP 80711 |
12.20 |
| 2026-05-15 12:00 |
16:27:45.90 |
-17:19:33.4 |
HIP 80711 |
16.69 |
| 2026-05-16 00:00 |
16:27:23.65 |
-17:19:00.2 |
HIP 80711 |
21.58 |
| 2026-05-16 12:00 |
16:27:01.33 |
-17:18:27.0 |
HIP 80711 |
26.66 |
| 2026-05-17 00:00 |
16:26:38.94 |
-17:17:53.8 |
HIP 80570 |
28.73 |
| 2026-05-17 12:00 |
16:26:16.48 |
-17:17:20.6 |
HIP 80403 |
27.93 |
| 2026-05-18 00:00 |
16:25:53.96 |
-17:16:47.4 |
HIP 80403 |
24.16 |
| 2026-05-18 12:00 |
16:25:31.39 |
-17:16:14.2 |
HIP 80403 |
21.10 |
| 2026-05-19 00:00 |
16:25:08.76 |
-17:15:41.0 |
HIP 80403 |
19.11 |
| 2026-05-19 12:00 |
16:24:46.08 |
-17:15:07.8 |
HIP 80403 |
18.55 |
| 2026-05-20 00:00 |
16:24:23.36 |
-17:14:34.6 |
HIP 80403 |
19.55 |
| 2026-05-20 12:00 |
16:24:00.59 |
-17:14:01.5 |
HIP 80240 |
20.55 |
| 2026-05-21 00:00 |
16:23:37.79 |
-17:13:28.4 |
HIP 80240 |
16.23 |
| 2026-05-21 12:00 |
16:23:14.95 |
-17:12:55.4 |
HIP 80240 |
12.83 |
| 2026-05-22 00:00 |
16:22:52.08 |
-17:12:22.4 |
HIP 80240 |
11.23 |
| 2026-05-22 12:00 |
16:22:29.18 |
-17:11:49.4 |
HIP 80240 |
12.16 |
| 2026-05-23 00:00 |
16:22:06.26 |
-17:11:16.5 |
HIP 80240 |
15.18 |
| 2026-05-23 12:00 |
16:21:43.32 |
-17:10:43.7 |
HIP 80072 |
17.45 |
| 2026-05-24 00:00 |
16:21:20.35 |
-17:10:11.0 |
HIP 80072 |
12.17 |
| 2026-05-24 12:00 |
16:20:57.38 |
-17:09:38.3 |
HIP 80072 |
7.24 |
| 2026-05-25 00:00 |
16:20:34.40 |
-17:09:05.8 |
HIP 80072 |
4.19 |
| 2026-05-25 12:00 |
16:20:11.41 |
-17:08:33.3 |
HIP 80072 |
6.61 |
| 2026-05-26 00:00 |
16:19:48.41 |
-17:08:00.9 |
HIP 80072 |
11.43 |
| 2026-05-26 12:00 |
16:19:25.42 |
-17:07:28.7 |
HIP 80072 |
16.69 |
| 2026-05-27 00:00 |
16:19:02.43 |
-17:06:56.5 |
HIP 79895 |
18.36 |
| 2026-05-27 12:00 |
16:18:39.45 |
-17:06:24.5 |
HIP 79895 |
17.10 |
| 2026-05-28 00:00 |
16:18:16.48 |
-17:05:52.6 |
HIP 79895 |
17.56 |
| 2026-05-28 12:00 |
16:17:53.52 |
-17:05:20.9 |
HIP 79895 |
19.62 |
| 2026-05-29 00:00 |
16:17:30.58 |
-17:04:49.3 |
HIP 79895 |
22.85 |
| 2026-05-29 12:00 |
16:17:07.66 |
-17:04:17.8 |
HIP 79895 |
26.82 |
| 2026-05-30 00:00 |
16:16:44.76 |
-17:03:46.5 |
HIP 79895 |
31.25 |
| 2026-05-30 12:00 |
16:16:21.90 |
-17:03:15.4 |
HIP 79895 |
35.97 |
| 2026-05-31 00:00 |
16:15:59.06 |
-17:02:44.4 |
HIP 79579 |
33.88 |
| 2026-05-31 12:00 |
16:15:36.26 |
-17:02:13.6 |
HIP 79579 |
30.38 |
| 2026-06-01 00:00 |
16:15:13.49 |
-17:01:43.0 |
HIP 79579 |
27.54 |
| 2026-06-01 12:00 |
16:14:50.77 |
-17:01:12.6 |
HIP 79579 |
25.55 |
| 2026-06-02 00:00 |
16:14:28.08 |
-17:00:42.4 |
HIP 79579 |
24.64 |