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) |
| 2026-05-12 00:00 |
18:11:47.59 |
-03:14:43.5 |
HIP 89236 |
18.84 |
| 2026-05-12 12:00 |
18:11:46.35 |
-03:14:37.7 |
HIP 89236 |
19.11 |
| 2026-05-13 00:00 |
18:11:45.09 |
-03:14:32.0 |
HIP 89236 |
19.39 |
| 2026-05-13 12:00 |
18:11:43.82 |
-03:14:26.3 |
HIP 89236 |
19.67 |
| 2026-05-14 00:00 |
18:11:42.55 |
-03:14:20.7 |
HIP 89236 |
19.95 |
| 2026-05-14 12:00 |
18:11:41.26 |
-03:14:15.1 |
HIP 89236 |
20.24 |
| 2026-05-15 00:00 |
18:11:39.97 |
-03:14:09.6 |
HIP 89236 |
20.53 |
| 2026-05-15 12:00 |
18:11:38.66 |
-03:14:04.1 |
HIP 89236 |
20.82 |
| 2026-05-16 00:00 |
18:11:37.35 |
-03:13:58.7 |
HIP 89068 |
20.97 |
| 2026-05-16 12:00 |
18:11:36.03 |
-03:13:53.4 |
HIP 89068 |
20.68 |
| 2026-05-17 00:00 |
18:11:34.70 |
-03:13:48.1 |
HIP 89068 |
20.40 |
| 2026-05-17 12:00 |
18:11:33.36 |
-03:13:42.9 |
HIP 89068 |
20.12 |
| 2026-05-18 00:00 |
18:11:32.02 |
-03:13:37.7 |
HIP 89068 |
19.84 |
| 2026-05-18 12:00 |
18:11:30.66 |
-03:13:32.6 |
HIP 89068 |
19.56 |
| 2026-05-19 00:00 |
18:11:29.30 |
-03:13:27.6 |
HIP 89068 |
19.29 |
| 2026-05-19 12:00 |
18:11:27.93 |
-03:13:22.6 |
HIP 89068 |
19.01 |
| 2026-05-20 00:00 |
18:11:26.55 |
-03:13:17.7 |
HIP 89068 |
18.74 |
| 2026-05-20 12:00 |
18:11:25.16 |
-03:13:12.9 |
HIP 89068 |
18.47 |
| 2026-05-21 00:00 |
18:11:23.77 |
-03:13:08.1 |
HIP 89068 |
18.21 |
| 2026-05-21 12:00 |
18:11:22.37 |
-03:13:03.4 |
HIP 89068 |
17.94 |
| 2026-05-22 00:00 |
18:11:20.96 |
-03:12:58.7 |
HIP 89068 |
17.68 |
| 2026-05-22 12:00 |
18:11:19.54 |
-03:12:54.1 |
HIP 89068 |
17.43 |
| 2026-05-23 00:00 |
18:11:18.11 |
-03:12:49.5 |
HIP 89068 |
17.17 |
| 2026-05-23 12:00 |
18:11:16.68 |
-03:12:45.1 |
HIP 89068 |
16.92 |
| 2026-05-24 00:00 |
18:11:15.24 |
-03:12:40.7 |
HIP 89068 |
16.68 |
| 2026-05-24 12:00 |
18:11:13.80 |
-03:12:36.3 |
HIP 89068 |
16.44 |
| 2026-05-25 00:00 |
18:11:12.34 |
-03:12:32.0 |
HIP 89068 |
16.20 |
| 2026-05-25 12:00 |
18:11:10.88 |
-03:12:27.8 |
HIP 89068 |
15.97 |
| 2026-05-26 00:00 |
18:11:09.42 |
-03:12:23.7 |
HIP 89068 |
15.75 |
| 2026-05-26 12:00 |
18:11:07.94 |
-03:12:19.6 |
HIP 89068 |
15.53 |
| 2026-05-27 00:00 |
18:11:06.47 |
-03:12:15.5 |
HIP 89068 |
15.32 |
| 2026-05-27 12:00 |
18:11:04.98 |
-03:12:11.6 |
HIP 89068 |
15.12 |
| 2026-05-28 00:00 |
18:11:03.49 |
-03:12:07.7 |
HIP 89068 |
14.92 |
| 2026-05-28 12:00 |
18:11:01.99 |
-03:12:03.9 |
HIP 89068 |
14.73 |
| 2026-05-29 00:00 |
18:11:00.48 |
-03:12:00.1 |
HIP 89068 |
14.54 |
| 2026-05-29 12:00 |
18:10:58.97 |
-03:11:56.4 |
HIP 89068 |
14.37 |
| 2026-05-30 00:00 |
18:10:57.46 |
-03:11:52.8 |
HIP 89068 |
14.21 |
| 2026-05-30 12:00 |
18:10:55.94 |
-03:11:49.2 |
HIP 89068 |
14.05 |
| 2026-05-31 00:00 |
18:10:54.41 |
-03:11:45.7 |
HIP 89068 |
13.90 |
| 2026-05-31 12:00 |
18:10:52.87 |
-03:11:42.3 |
HIP 89068 |
13.77 |
| 2026-06-01 00:00 |
18:10:51.34 |
-03:11:38.9 |
HIP 89068 |
13.64 |
| 2026-06-01 12:00 |
18:10:49.79 |
-03:11:35.6 |
HIP 89068 |
13.53 |
| 2026-06-02 00:00 |
18:10:48.24 |
-03:11:32.4 |
HIP 89068 |
13.42 |