メタデータ
| 項目 |
値 |
| Designation |
C/1948 T1 (Wirtanen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1947-09-03T21:00:21.755520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:09Z |
| Obs used |
19 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
8.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1949-11-26.0000000 |
| e |
1.00069715 |
| q (au) |
3.268165 |
| a (au) |
-4687.881007 |
| i (deg) |
155.078426 |
| Ω (om, deg) |
122.125436 |
| ω (w, deg) |
73.549407 |
| M (ma, deg) |
0.002500 |
等級
散乱 + 全体線形
$$
M_a = (-0.036 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-0.036 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.507 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
16:28:31.56 |
-41:49:12.5 |
HIP 80746 |
13.71 |
| 2026-06-01 12:00 |
16:28:29.96 |
-41:49:09.9 |
HIP 80746 |
13.83 |
| 2026-06-02 00:00 |
16:28:28.36 |
-41:49:07.2 |
HIP 80746 |
13.96 |
| 2026-06-02 12:00 |
16:28:26.76 |
-41:49:04.5 |
HIP 80746 |
14.09 |
| 2026-06-03 00:00 |
16:28:25.15 |
-41:49:01.7 |
HIP 80746 |
14.22 |
| 2026-06-03 12:00 |
16:28:23.55 |
-41:48:58.8 |
HIP 80746 |
14.36 |
| 2026-06-04 00:00 |
16:28:21.95 |
-41:48:55.9 |
HIP 80746 |
14.50 |
| 2026-06-04 12:00 |
16:28:20.36 |
-41:48:53.0 |
HIP 80746 |
14.65 |
| 2026-06-05 00:00 |
16:28:18.76 |
-41:48:50.0 |
HIP 80746 |
14.80 |
| 2026-06-05 12:00 |
16:28:17.16 |
-41:48:46.9 |
HIP 80746 |
14.95 |
| 2026-06-06 00:00 |
16:28:15.57 |
-41:48:43.8 |
HIP 80746 |
15.11 |
| 2026-06-06 12:00 |
16:28:13.97 |
-41:48:40.7 |
HIP 80746 |
15.27 |
| 2026-06-07 00:00 |
16:28:12.38 |
-41:48:37.5 |
HIP 80746 |
15.44 |
| 2026-06-07 12:00 |
16:28:10.79 |
-41:48:34.2 |
HIP 80746 |
15.61 |
| 2026-06-08 00:00 |
16:28:09.20 |
-41:48:30.9 |
HIP 80746 |
15.78 |
| 2026-06-08 12:00 |
16:28:07.62 |
-41:48:27.6 |
HIP 80746 |
15.95 |
| 2026-06-09 00:00 |
16:28:06.03 |
-41:48:24.2 |
HIP 80746 |
16.13 |
| 2026-06-09 12:00 |
16:28:04.45 |
-41:48:20.8 |
HIP 80746 |
16.31 |
| 2026-06-10 00:00 |
16:28:02.87 |
-41:48:17.3 |
HIP 80746 |
16.50 |
| 2026-06-10 12:00 |
16:28:01.29 |
-41:48:13.7 |
HIP 80746 |
16.68 |
| 2026-06-11 00:00 |
16:27:59.72 |
-41:48:10.1 |
HIP 80746 |
16.87 |
| 2026-06-11 12:00 |
16:27:58.15 |
-41:48:06.5 |
HIP 80746 |
17.06 |
| 2026-06-12 00:00 |
16:27:56.58 |
-41:48:02.8 |
HIP 80746 |
17.25 |
| 2026-06-12 12:00 |
16:27:55.01 |
-41:47:59.1 |
HIP 80746 |
17.45 |
| 2026-06-13 00:00 |
16:27:53.44 |
-41:47:55.3 |
HIP 80746 |
17.64 |
| 2026-06-13 12:00 |
16:27:51.88 |
-41:47:51.5 |
HIP 80746 |
17.84 |
| 2026-06-14 00:00 |
16:27:50.32 |
-41:47:47.6 |
HIP 80746 |
18.04 |
| 2026-06-14 12:00 |
16:27:48.77 |
-41:47:43.7 |
HIP 80746 |
18.25 |
| 2026-06-15 00:00 |
16:27:47.22 |
-41:47:39.8 |
HIP 80746 |
18.45 |
| 2026-06-15 12:00 |
16:27:45.67 |
-41:47:35.8 |
HIP 80746 |
18.66 |
| 2026-06-16 00:00 |
16:27:44.13 |
-41:47:31.7 |
HIP 80746 |
18.86 |
| 2026-06-16 12:00 |
16:27:42.59 |
-41:47:27.6 |
HIP 80746 |
19.07 |
| 2026-06-17 00:00 |
16:27:41.05 |
-41:47:23.5 |
HIP 80746 |
19.28 |
| 2026-06-17 12:00 |
16:27:39.52 |
-41:47:19.3 |
HIP 80746 |
19.49 |
| 2026-06-18 00:00 |
16:27:37.99 |
-41:47:15.1 |
HIP 80746 |
19.70 |
| 2026-06-18 12:00 |
16:27:36.47 |
-41:47:10.8 |
HIP 80746 |
19.92 |
| 2026-06-19 00:00 |
16:27:34.95 |
-41:47:06.5 |
HIP 80746 |
20.13 |
| 2026-06-19 12:00 |
16:27:33.43 |
-41:47:02.1 |
HIP 80746 |
20.35 |
| 2026-06-20 00:00 |
16:27:31.92 |
-41:46:57.7 |
HIP 80746 |
20.56 |
| 2026-06-20 12:00 |
16:27:30.42 |
-41:46:53.3 |
HIP 80746 |
20.78 |
| 2026-06-21 00:00 |
16:27:28.91 |
-41:46:48.8 |
HIP 80746 |
21.00 |
| 2026-06-21 12:00 |
16:27:27.42 |
-41:46:44.3 |
HIP 80746 |
21.21 |
| 2026-06-22 00:00 |
16:27:25.93 |
-41:46:39.7 |
HIP 80746 |
21.43 |