メタデータ
| 項目 |
値 |
| Designation |
C/1978 R3 (Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1978-08-13T16:08:35.136960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
46 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1978-11-02.0000000 |
| e |
1.00028144 |
| q (au) |
1.771588 |
| a (au) |
-6294.758943 |
| i (deg) |
130.636426 |
| Ω (om, deg) |
290.677833 |
| ω (w, deg) |
224.754011 |
| M (ma, deg) |
0.000159 |
等級
散乱 + 全体線形
$$
M_a = (7.180 + 2.924\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.180 |
| n |
2.924 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-03-26 00:00 |
18:12:52.68 |
-03:26:51.8 |
HIP 89236 |
4.70 |
| 2026-03-26 12:00 |
18:12:52.61 |
-03:26:42.9 |
HIP 89236 |
4.76 |
| 2026-03-27 00:00 |
18:12:52.52 |
-03:26:34.1 |
HIP 89236 |
4.82 |
| 2026-03-27 12:00 |
18:12:52.42 |
-03:26:25.2 |
HIP 89236 |
4.88 |
| 2026-03-28 00:00 |
18:12:52.30 |
-03:26:16.4 |
HIP 89236 |
4.94 |
| 2026-03-28 12:00 |
18:12:52.17 |
-03:26:07.5 |
HIP 89236 |
5.00 |
| 2026-03-29 00:00 |
18:12:52.03 |
-03:25:58.7 |
HIP 89236 |
5.06 |
| 2026-03-29 12:00 |
18:12:51.87 |
-03:25:49.9 |
HIP 89236 |
5.12 |
| 2026-03-30 00:00 |
18:12:51.70 |
-03:25:41.1 |
HIP 89236 |
5.19 |
| 2026-03-30 12:00 |
18:12:51.51 |
-03:25:32.3 |
HIP 89236 |
5.25 |
| 2026-03-31 00:00 |
18:12:51.31 |
-03:25:23.5 |
HIP 89236 |
5.32 |
| 2026-03-31 12:00 |
18:12:51.09 |
-03:25:14.7 |
HIP 89236 |
5.39 |
| 2026-04-01 00:00 |
18:12:50.87 |
-03:25:05.9 |
HIP 89236 |
5.45 |
| 2026-04-01 12:00 |
18:12:50.62 |
-03:24:57.2 |
HIP 89236 |
5.52 |
| 2026-04-02 00:00 |
18:12:50.36 |
-03:24:48.4 |
HIP 89236 |
5.59 |
| 2026-04-02 12:00 |
18:12:50.09 |
-03:24:39.7 |
HIP 89236 |
5.67 |
| 2026-04-03 00:00 |
18:12:49.81 |
-03:24:31.0 |
HIP 89236 |
5.74 |
| 2026-04-03 12:00 |
18:12:49.51 |
-03:24:22.3 |
HIP 89236 |
5.81 |
| 2026-04-04 00:00 |
18:12:49.20 |
-03:24:13.6 |
HIP 89236 |
5.89 |
| 2026-04-04 12:00 |
18:12:48.87 |
-03:24:04.9 |
HIP 89236 |
5.97 |
| 2026-04-05 00:00 |
18:12:48.53 |
-03:23:56.3 |
HIP 89236 |
6.05 |
| 2026-04-05 12:00 |
18:12:48.17 |
-03:23:47.6 |
HIP 89236 |
6.13 |
| 2026-04-06 00:00 |
18:12:47.80 |
-03:23:39.0 |
HIP 89236 |
6.21 |
| 2026-04-06 12:00 |
18:12:47.42 |
-03:23:30.4 |
HIP 89236 |
6.29 |
| 2026-04-07 00:00 |
18:12:47.03 |
-03:23:21.9 |
HIP 89236 |
6.38 |
| 2026-04-07 12:00 |
18:12:46.62 |
-03:23:13.3 |
HIP 89236 |
6.47 |
| 2026-04-08 00:00 |
18:12:46.19 |
-03:23:04.8 |
HIP 89236 |
6.55 |
| 2026-04-08 12:00 |
18:12:45.75 |
-03:22:56.3 |
HIP 89236 |
6.65 |
| 2026-04-09 00:00 |
18:12:45.30 |
-03:22:47.8 |
HIP 89236 |
6.74 |
| 2026-04-09 12:00 |
18:12:44.84 |
-03:22:39.3 |
HIP 89236 |
6.84 |
| 2026-04-10 00:00 |
18:12:44.36 |
-03:22:30.8 |
HIP 89236 |
6.93 |
| 2026-04-10 12:00 |
18:12:43.87 |
-03:22:22.4 |
HIP 89236 |
7.03 |
| 2026-04-11 00:00 |
18:12:43.36 |
-03:22:14.0 |
HIP 89236 |
7.14 |
| 2026-04-11 12:00 |
18:12:42.84 |
-03:22:05.6 |
HIP 89236 |
7.24 |
| 2026-04-12 00:00 |
18:12:42.31 |
-03:21:57.3 |
HIP 89236 |
7.35 |
| 2026-04-12 12:00 |
18:12:41.76 |
-03:21:49.0 |
HIP 89236 |
7.46 |
| 2026-04-13 00:00 |
18:12:41.20 |
-03:21:40.7 |
HIP 89236 |
7.57 |
| 2026-04-13 12:00 |
18:12:40.63 |
-03:21:32.4 |
HIP 89236 |
7.68 |
| 2026-04-14 00:00 |
18:12:40.04 |
-03:21:24.1 |
HIP 89236 |
7.80 |
| 2026-04-14 12:00 |
18:12:39.44 |
-03:21:15.9 |
HIP 89236 |
7.92 |
| 2026-04-15 00:00 |
18:12:38.83 |
-03:21:07.7 |
HIP 89236 |
8.04 |
| 2026-04-15 12:00 |
18:12:38.20 |
-03:20:59.6 |
HIP 89236 |
8.16 |
| 2026-04-16 00:00 |
18:12:37.56 |
-03:20:51.4 |
HIP 89236 |
8.29 |