メタデータ
| 項目 |
値 |
| Designation |
C/1948 N1 (Wirtanen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1949-05-01T03:57:14.875200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:09Z |
| Obs used |
20 |
| NEO |
- |
| M1 |
11.300 |
| 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) |
1950-03-16.0000000 |
| e |
0.99945965 |
| q (au) |
2.517468 |
| a (au) |
4658.939225 |
| i (deg) |
130.267603 |
| Ω (om, deg) |
120.604872 |
| ω (w, deg) |
229.968351 |
| M (ma, deg) |
0.000988 |
等級
散乱 + 全体線形
$$
M_a = (7.043 + 4.134\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.043 |
| n |
4.134 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
06:45:39.68 |
+46:35:13.3 |
HIP 32361 |
17.10 |
| 2026-06-01 12:00 |
06:45:41.11 |
+46:35:08.9 |
HIP 32361 |
17.23 |
| 2026-06-02 00:00 |
06:45:42.56 |
+46:35:04.6 |
HIP 32361 |
17.36 |
| 2026-06-02 12:00 |
06:45:44.01 |
+46:35:00.4 |
HIP 32361 |
17.49 |
| 2026-06-03 00:00 |
06:45:45.47 |
+46:34:56.2 |
HIP 32361 |
17.62 |
| 2026-06-03 12:00 |
06:45:46.93 |
+46:34:52.0 |
HIP 32361 |
17.76 |
| 2026-06-04 00:00 |
06:45:48.40 |
+46:34:47.9 |
HIP 32361 |
17.90 |
| 2026-06-04 12:00 |
06:45:49.88 |
+46:34:43.8 |
HIP 32361 |
18.04 |
| 2026-06-05 00:00 |
06:45:51.37 |
+46:34:39.8 |
HIP 32361 |
18.19 |
| 2026-06-05 12:00 |
06:45:52.86 |
+46:34:35.8 |
HIP 32361 |
18.33 |
| 2026-06-06 00:00 |
06:45:54.35 |
+46:34:31.9 |
HIP 32361 |
18.48 |
| 2026-06-06 12:00 |
06:45:55.86 |
+46:34:28.0 |
HIP 32361 |
18.63 |
| 2026-06-07 00:00 |
06:45:57.37 |
+46:34:24.2 |
HIP 32361 |
18.79 |
| 2026-06-07 12:00 |
06:45:58.88 |
+46:34:20.4 |
HIP 32361 |
18.94 |
| 2026-06-08 00:00 |
06:46:00.40 |
+46:34:16.7 |
HIP 32361 |
19.10 |
| 2026-06-08 12:00 |
06:46:01.93 |
+46:34:13.0 |
HIP 32361 |
19.26 |
| 2026-06-09 00:00 |
06:46:03.46 |
+46:34:09.3 |
HIP 32361 |
19.42 |
| 2026-06-09 12:00 |
06:46:04.99 |
+46:34:05.7 |
HIP 32361 |
19.58 |
| 2026-06-10 00:00 |
06:46:06.54 |
+46:34:02.2 |
HIP 32361 |
19.75 |
| 2026-06-10 12:00 |
06:46:08.08 |
+46:33:58.7 |
HIP 32361 |
19.91 |
| 2026-06-11 00:00 |
06:46:09.64 |
+46:33:55.3 |
HIP 32361 |
20.08 |
| 2026-06-11 12:00 |
06:46:11.19 |
+46:33:51.9 |
HIP 32361 |
20.26 |
| 2026-06-12 00:00 |
06:46:12.76 |
+46:33:48.5 |
HIP 32361 |
20.43 |
| 2026-06-12 12:00 |
06:46:14.32 |
+46:33:45.3 |
HIP 32361 |
20.60 |
| 2026-06-13 00:00 |
06:46:15.90 |
+46:33:42.0 |
HIP 32361 |
20.78 |
| 2026-06-13 12:00 |
06:46:17.47 |
+46:33:38.8 |
HIP 32361 |
20.96 |
| 2026-06-14 00:00 |
06:46:19.05 |
+46:33:35.7 |
HIP 32361 |
21.14 |
| 2026-06-14 12:00 |
06:46:20.64 |
+46:33:32.6 |
HIP 32361 |
21.32 |
| 2026-06-15 00:00 |
06:46:22.23 |
+46:33:29.6 |
HIP 32361 |
21.50 |
| 2026-06-15 12:00 |
06:46:23.82 |
+46:33:26.6 |
HIP 32361 |
21.69 |
| 2026-06-16 00:00 |
06:46:25.42 |
+46:33:23.7 |
HIP 32361 |
21.88 |
| 2026-06-16 12:00 |
06:46:27.02 |
+46:33:20.8 |
HIP 32361 |
22.06 |
| 2026-06-17 00:00 |
06:46:28.63 |
+46:33:18.0 |
HIP 32361 |
22.25 |
| 2026-06-17 12:00 |
06:46:30.24 |
+46:33:15.3 |
HIP 32361 |
22.44 |
| 2026-06-18 00:00 |
06:46:31.85 |
+46:33:12.5 |
HIP 32361 |
22.64 |
| 2026-06-18 12:00 |
06:46:33.46 |
+46:33:09.9 |
HIP 32361 |
22.83 |
| 2026-06-19 00:00 |
06:46:35.08 |
+46:33:07.3 |
HIP 32361 |
23.03 |
| 2026-06-19 12:00 |
06:46:36.71 |
+46:33:04.7 |
HIP 32361 |
23.22 |
| 2026-06-20 00:00 |
06:46:38.33 |
+46:33:02.2 |
HIP 32361 |
23.42 |
| 2026-06-20 12:00 |
06:46:39.96 |
+46:32:59.8 |
HIP 32361 |
23.62 |
| 2026-06-21 00:00 |
06:46:41.59 |
+46:32:57.4 |
HIP 32361 |
23.82 |
| 2026-06-21 12:00 |
06:46:43.22 |
+46:32:55.1 |
HIP 32361 |
24.02 |
| 2026-06-22 00:00 |
06:46:44.86 |
+46:32:52.8 |
HIP 32361 |
24.23 |