メタデータ
| 項目 |
値 |
| Designation |
C/2018 V1 (Machholz-Fujikawa-Iwamoto) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-12-03T12:11:39.986880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:46Z |
| Obs used |
750 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
6.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-11-16.0000000 |
| e |
1.00039061 |
| q (au) |
0.386955 |
| a (au) |
-990.650949 |
| i (deg) |
143.987960 |
| Ω (om, deg) |
128.722091 |
| ω (w, deg) |
88.774914 |
| M (ma, deg) |
-0.000553 |
等級
散乱 + 全体線形
$$
M_a = (12.888 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.888 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2018-11-08 |
2018-11-17 |
-1.9894 |
-0.711 |
| 2018-11-17 |
2018-12-01 |
+3.0505 |
+1.813 |
| 2018-12-04 |
2018-12-17 |
+11.8201 |
+5.111 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
14:54:09.21 |
-54:14:32.8 |
HIP 72746 |
29.46 |
| 2026-06-01 12:00 |
14:54:00.28 |
-54:13:52.4 |
HIP 72746 |
29.37 |
| 2026-06-02 00:00 |
14:53:51.40 |
-54:13:11.6 |
HIP 72746 |
29.36 |
| 2026-06-02 12:00 |
14:53:42.56 |
-54:12:30.5 |
HIP 72746 |
29.42 |
| 2026-06-03 00:00 |
14:53:33.76 |
-54:11:49.1 |
HIP 72746 |
29.57 |
| 2026-06-03 12:00 |
14:53:25.01 |
-54:11:07.3 |
HIP 72746 |
29.79 |
| 2026-06-04 00:00 |
14:53:16.29 |
-54:10:25.1 |
HIP 72746 |
30.09 |
| 2026-06-04 12:00 |
14:53:07.63 |
-54:09:42.6 |
HIP 72746 |
30.46 |
| 2026-06-05 00:00 |
14:52:59.01 |
-54:08:59.8 |
HIP 72746 |
30.91 |
| 2026-06-05 12:00 |
14:52:50.43 |
-54:08:16.6 |
HIP 72746 |
31.41 |
| 2026-06-06 00:00 |
14:52:41.90 |
-54:07:33.2 |
HIP 72746 |
31.99 |
| 2026-06-06 12:00 |
14:52:33.42 |
-54:06:49.3 |
HIP 72746 |
32.62 |
| 2026-06-07 00:00 |
14:52:24.98 |
-54:06:05.2 |
HIP 72443 |
31.56 |
| 2026-06-07 12:00 |
14:52:16.60 |
-54:05:20.8 |
HIP 72443 |
30.35 |
| 2026-06-08 00:00 |
14:52:08.26 |
-54:04:36.0 |
HIP 72443 |
29.17 |
| 2026-06-08 12:00 |
14:51:59.97 |
-54:03:51.0 |
HIP 72443 |
28.02 |
| 2026-06-09 00:00 |
14:51:51.73 |
-54:03:05.6 |
HIP 72443 |
26.90 |
| 2026-06-09 12:00 |
14:51:43.55 |
-54:02:19.9 |
HIP 72443 |
25.82 |
| 2026-06-10 00:00 |
14:51:35.41 |
-54:01:34.0 |
HIP 72443 |
24.78 |
| 2026-06-10 12:00 |
14:51:27.33 |
-54:00:47.7 |
HIP 72443 |
23.79 |
| 2026-06-11 00:00 |
14:51:19.30 |
-54:00:01.2 |
HIP 72595 |
22.84 |
| 2026-06-11 12:00 |
14:51:11.32 |
-53:59:14.4 |
HIP 72595 |
21.78 |
| 2026-06-12 00:00 |
14:51:03.40 |
-53:58:27.3 |
HIP 72595 |
20.75 |
| 2026-06-12 12:00 |
14:50:55.53 |
-53:57:39.9 |
HIP 72595 |
19.77 |
| 2026-06-13 00:00 |
14:50:47.71 |
-53:56:52.3 |
HIP 72595 |
18.84 |
| 2026-06-13 12:00 |
14:50:39.95 |
-53:56:04.4 |
HIP 72595 |
17.96 |
| 2026-06-14 00:00 |
14:50:32.25 |
-53:55:16.2 |
HIP 72595 |
17.15 |
| 2026-06-14 12:00 |
14:50:24.61 |
-53:54:27.8 |
HIP 72595 |
16.42 |
| 2026-06-15 00:00 |
14:50:17.02 |
-53:53:39.2 |
HIP 72595 |
15.76 |
| 2026-06-15 12:00 |
14:50:09.49 |
-53:52:50.3 |
HIP 72595 |
15.20 |
| 2026-06-16 00:00 |
14:50:02.02 |
-53:52:01.1 |
HIP 72595 |
14.74 |
| 2026-06-16 12:00 |
14:49:54.60 |
-53:51:11.7 |
HIP 72595 |
14.39 |
| 2026-06-17 00:00 |
14:49:47.25 |
-53:50:22.1 |
HIP 72595 |
14.16 |
| 2026-06-17 12:00 |
14:49:39.96 |
-53:49:32.3 |
HIP 72595 |
14.04 |
| 2026-06-18 00:00 |
14:49:32.72 |
-53:48:42.3 |
HIP 72595 |
14.05 |
| 2026-06-18 12:00 |
14:49:25.55 |
-53:47:52.0 |
HIP 72595 |
14.19 |
| 2026-06-19 00:00 |
14:49:18.44 |
-53:47:01.5 |
HIP 72595 |
14.44 |
| 2026-06-19 12:00 |
14:49:11.39 |
-53:46:10.9 |
HIP 72595 |
14.80 |
| 2026-06-20 00:00 |
14:49:04.41 |
-53:45:20.0 |
HIP 72595 |
15.26 |
| 2026-06-20 12:00 |
14:48:57.49 |
-53:44:28.9 |
HIP 72595 |
15.81 |
| 2026-06-21 00:00 |
14:48:50.63 |
-53:43:37.7 |
HIP 72595 |
16.44 |
| 2026-06-21 12:00 |
14:48:43.83 |
-53:42:46.2 |
HIP 72595 |
17.14 |
| 2026-06-22 00:00 |
14:48:37.10 |
-53:41:54.6 |
HIP 72595 |
17.91 |