メタデータ
| 項目 |
値 |
| Designation |
C/1994 T1 (Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1994-10-02T13:22:18.399360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
344 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
5.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1994-11-26.0000000 |
| e |
0.99949492 |
| q (au) |
1.845392 |
| a (au) |
3653.643991 |
| i (deg) |
101.737600 |
| Ω (om, deg) |
249.943625 |
| ω (w, deg) |
142.784278 |
| M (ma, deg) |
0.000243 |
等級
散乱 + 全体線形
$$
M_a = (9.712 + 3.102\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.712 |
| n |
3.102 |
| gf |
1.000 |
| gb |
-0.544 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
18:00:36.39 |
-79:59:47.9 |
HIP 88757 |
19.67 |
| 2026-03-26 12:00 |
18:00:35.25 |
-80:00:14.2 |
HIP 88757 |
19.92 |
| 2026-03-27 00:00 |
18:00:33.99 |
-80:00:40.5 |
HIP 88757 |
20.19 |
| 2026-03-27 12:00 |
18:00:32.63 |
-80:01:06.8 |
HIP 88757 |
20.46 |
| 2026-03-28 00:00 |
18:00:31.15 |
-80:01:33.0 |
HIP 88757 |
20.75 |
| 2026-03-28 12:00 |
18:00:29.57 |
-80:01:59.2 |
HIP 88757 |
21.04 |
| 2026-03-29 00:00 |
18:00:27.87 |
-80:02:25.4 |
HIP 88757 |
21.34 |
| 2026-03-29 12:00 |
18:00:26.06 |
-80:02:51.6 |
HIP 88757 |
21.65 |
| 2026-03-30 00:00 |
18:00:24.15 |
-80:03:17.7 |
HIP 88757 |
21.97 |
| 2026-03-30 12:00 |
18:00:22.12 |
-80:03:43.8 |
HIP 88757 |
22.29 |
| 2026-03-31 00:00 |
18:00:19.98 |
-80:04:09.9 |
HIP 88757 |
22.63 |
| 2026-03-31 12:00 |
18:00:17.73 |
-80:04:35.9 |
HIP 88757 |
22.97 |
| 2026-04-01 00:00 |
18:00:15.37 |
-80:05:01.9 |
HIP 88757 |
23.32 |
| 2026-04-01 12:00 |
18:00:12.90 |
-80:05:27.9 |
HIP 88757 |
23.67 |
| 2026-04-02 00:00 |
18:00:10.31 |
-80:05:53.7 |
HIP 88757 |
24.03 |
| 2026-04-02 12:00 |
18:00:07.62 |
-80:06:19.6 |
HIP 88757 |
24.39 |
| 2026-04-03 00:00 |
18:00:04.82 |
-80:06:45.4 |
HIP 88757 |
24.77 |
| 2026-04-03 12:00 |
18:00:01.90 |
-80:07:11.1 |
HIP 88757 |
25.14 |
| 2026-04-04 00:00 |
17:59:58.87 |
-80:07:36.8 |
HIP 88757 |
25.52 |
| 2026-04-04 12:00 |
17:59:55.74 |
-80:08:02.5 |
HIP 88757 |
25.91 |
| 2026-04-05 00:00 |
17:59:52.49 |
-80:08:28.1 |
HIP 88757 |
26.30 |
| 2026-04-05 12:00 |
17:59:49.13 |
-80:08:53.6 |
HIP 88757 |
26.70 |
| 2026-04-06 00:00 |
17:59:45.66 |
-80:09:19.1 |
HIP 88757 |
27.10 |
| 2026-04-06 12:00 |
17:59:42.08 |
-80:09:44.5 |
HIP 88757 |
27.50 |
| 2026-04-07 00:00 |
17:59:38.39 |
-80:10:09.8 |
HIP 88757 |
27.91 |
| 2026-04-07 12:00 |
17:59:34.58 |
-80:10:35.1 |
HIP 88757 |
28.32 |
| 2026-04-08 00:00 |
17:59:30.67 |
-80:11:00.3 |
HIP 88757 |
28.74 |
| 2026-04-08 12:00 |
17:59:26.64 |
-80:11:25.4 |
HIP 88757 |
29.15 |
| 2026-04-09 00:00 |
17:59:22.51 |
-80:11:50.4 |
HIP 88538 |
29.18 |
| 2026-04-09 12:00 |
17:59:18.26 |
-80:12:15.4 |
HIP 88538 |
28.89 |
| 2026-04-10 00:00 |
17:59:13.90 |
-80:12:40.3 |
HIP 88538 |
28.61 |
| 2026-04-10 12:00 |
17:59:09.43 |
-80:13:05.1 |
HIP 88538 |
28.34 |
| 2026-04-11 00:00 |
17:59:04.85 |
-80:13:29.9 |
HIP 88538 |
28.07 |
| 2026-04-11 12:00 |
17:59:00.16 |
-80:13:54.5 |
HIP 88538 |
27.82 |
| 2026-04-12 00:00 |
17:58:55.36 |
-80:14:19.1 |
HIP 88538 |
27.57 |
| 2026-04-12 12:00 |
17:58:50.45 |
-80:14:43.6 |
HIP 88538 |
27.33 |
| 2026-04-13 00:00 |
17:58:45.43 |
-80:15:07.9 |
HIP 88538 |
27.10 |
| 2026-04-13 12:00 |
17:58:40.30 |
-80:15:32.2 |
HIP 88538 |
26.88 |
| 2026-04-14 00:00 |
17:58:35.06 |
-80:15:56.4 |
HIP 88538 |
26.67 |
| 2026-04-14 12:00 |
17:58:29.71 |
-80:16:20.5 |
HIP 88538 |
26.47 |
| 2026-04-15 00:00 |
17:58:24.25 |
-80:16:44.5 |
HIP 88538 |
26.28 |
| 2026-04-15 12:00 |
17:58:18.68 |
-80:17:08.4 |
HIP 88538 |
26.10 |
| 2026-04-16 00:00 |
17:58:13.00 |
-80:17:32.2 |
HIP 88538 |
25.93 |