メタデータ
| 項目 |
値 |
| Designation |
C/1992 F1 (Tanaka-Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-04-22T16:35:26.859840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
167 |
| NEO |
- |
| M1 |
5.600 |
| 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) |
1992-05-25.0000000 |
| e |
0.99597703 |
| q (au) |
1.261503 |
| a (au) |
313.574953 |
| i (deg) |
79.292423 |
| Ω (om, deg) |
300.508310 |
| ω (w, deg) |
65.475657 |
| M (ma, deg) |
0.005735 |
等級
散乱 + 全体線形
$$
M_a = (4.541 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.541 |
| n |
6.000 |
| gf |
0.998 |
| 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 |
08:01:35.31 |
-28:25:52.8 |
HIP 39269 |
3.37 |
| 2026-06-01 12:00 |
08:01:36.83 |
-28:25:39.2 |
HIP 39269 |
2.98 |
| 2026-06-02 00:00 |
08:01:38.36 |
-28:25:25.7 |
HIP 39269 |
2.58 |
| 2026-06-02 12:00 |
08:01:39.90 |
-28:25:12.3 |
HIP 39269 |
2.18 |
| 2026-06-03 00:00 |
08:01:41.46 |
-28:24:59.1 |
HIP 39269 |
1.79 |
| 2026-06-03 12:00 |
08:01:43.02 |
-28:24:46.1 |
HIP 39269 |
1.40 |
| 2026-06-04 00:00 |
08:01:44.61 |
-28:24:33.2 |
HIP 39269 |
1.02 |
| 2026-06-04 12:00 |
08:01:46.20 |
-28:24:20.5 |
HIP 39269 |
0.68 |
| 2026-06-05 00:00 |
08:01:47.81 |
-28:24:08.0 |
HIP 39269 |
0.46 |
| 2026-06-05 12:00 |
08:01:49.43 |
-28:23:55.6 |
HIP 39269 |
0.55 |
| 2026-06-06 00:00 |
08:01:51.07 |
-28:23:43.4 |
HIP 39269 |
0.85 |
| 2026-06-06 12:00 |
08:01:52.72 |
-28:23:31.4 |
HIP 39269 |
1.22 |
| 2026-06-07 00:00 |
08:01:54.38 |
-28:23:19.5 |
HIP 39269 |
1.61 |
| 2026-06-07 12:00 |
08:01:56.05 |
-28:23:07.8 |
HIP 39269 |
2.01 |
| 2026-06-08 00:00 |
08:01:57.74 |
-28:22:56.3 |
HIP 39269 |
2.42 |
| 2026-06-08 12:00 |
08:01:59.44 |
-28:22:44.9 |
HIP 39269 |
2.83 |
| 2026-06-09 00:00 |
08:02:01.15 |
-28:22:33.7 |
HIP 39269 |
3.24 |
| 2026-06-09 12:00 |
08:02:02.87 |
-28:22:22.7 |
HIP 39269 |
3.65 |
| 2026-06-10 00:00 |
08:02:04.60 |
-28:22:11.8 |
HIP 39269 |
4.07 |
| 2026-06-10 12:00 |
08:02:06.35 |
-28:22:01.2 |
HIP 39269 |
4.49 |
| 2026-06-11 00:00 |
08:02:08.11 |
-28:21:50.6 |
HIP 39269 |
4.91 |
| 2026-06-11 12:00 |
08:02:09.88 |
-28:21:40.3 |
HIP 39269 |
5.33 |
| 2026-06-12 00:00 |
08:02:11.66 |
-28:21:30.2 |
HIP 39269 |
5.75 |
| 2026-06-12 12:00 |
08:02:13.45 |
-28:21:20.2 |
HIP 39269 |
6.18 |
| 2026-06-13 00:00 |
08:02:15.25 |
-28:21:10.4 |
HIP 39269 |
6.60 |
| 2026-06-13 12:00 |
08:02:17.07 |
-28:21:00.7 |
HIP 39269 |
7.03 |
| 2026-06-14 00:00 |
08:02:18.89 |
-28:20:51.3 |
HIP 39269 |
7.46 |
| 2026-06-14 12:00 |
08:02:20.73 |
-28:20:42.0 |
HIP 39269 |
7.89 |
| 2026-06-15 00:00 |
08:02:22.58 |
-28:20:32.9 |
HIP 39269 |
8.32 |
| 2026-06-15 12:00 |
08:02:24.44 |
-28:20:24.0 |
HIP 39269 |
8.75 |
| 2026-06-16 00:00 |
08:02:26.31 |
-28:20:15.3 |
HIP 39269 |
9.18 |
| 2026-06-16 12:00 |
08:02:28.19 |
-28:20:06.8 |
HIP 39269 |
9.61 |
| 2026-06-17 00:00 |
08:02:30.07 |
-28:19:58.4 |
HIP 39269 |
10.04 |
| 2026-06-17 12:00 |
08:02:31.97 |
-28:19:50.2 |
HIP 39269 |
10.48 |
| 2026-06-18 00:00 |
08:02:33.88 |
-28:19:42.2 |
HIP 39269 |
10.92 |
| 2026-06-18 12:00 |
08:02:35.80 |
-28:19:34.4 |
HIP 39269 |
11.35 |
| 2026-06-19 00:00 |
08:02:37.73 |
-28:19:26.8 |
HIP 39269 |
11.79 |
| 2026-06-19 12:00 |
08:02:39.67 |
-28:19:19.4 |
HIP 39269 |
12.23 |
| 2026-06-20 00:00 |
08:02:41.61 |
-28:19:12.1 |
HIP 39269 |
12.67 |
| 2026-06-20 12:00 |
08:02:43.57 |
-28:19:05.0 |
HIP 39269 |
13.11 |
| 2026-06-21 00:00 |
08:02:45.54 |
-28:18:58.2 |
HIP 39269 |
13.55 |
| 2026-06-21 12:00 |
08:02:47.51 |
-28:18:51.5 |
HIP 39269 |
13.99 |
| 2026-06-22 00:00 |
08:02:49.49 |
-28:18:44.9 |
HIP 39269 |
14.44 |