メタデータ
| 項目 |
値 |
| Designation |
C/1978 H1 (Meier) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1978-11-11T09:49:21.498240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:26Z |
| Obs used |
276 |
| NEO |
- |
| M1 |
5.100 |
| K1 |
7.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1978-12-13.0000000 |
| e |
1.00084968 |
| q (au) |
1.136526 |
| a (au) |
-1337.595649 |
| i (deg) |
43.761381 |
| Ω (om, deg) |
349.344795 |
| ω (w, deg) |
231.402033 |
| M (ma, deg) |
0.000636 |
等級
散乱 + 全体線形
$$
M_a = (1.696 + 4.508\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.696 |
| n |
4.508 |
| gf |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1978-04-27 |
1978-11-09 |
-2.4267 |
+0.754 |
| 1978-11-13 |
1979-12-21 |
-2.6793 |
+1.685 |
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) |
| 2026-05-12 00:00 |
00:26:15.41 |
+29:21:17.7 |
HIP 2133 |
20.50 |
| 2026-05-12 12:00 |
00:26:16.64 |
+29:21:31.6 |
HIP 2133 |
20.56 |
| 2026-05-13 00:00 |
00:26:17.86 |
+29:21:45.4 |
HIP 2133 |
20.63 |
| 2026-05-13 12:00 |
00:26:19.07 |
+29:21:59.3 |
HIP 2133 |
20.70 |
| 2026-05-14 00:00 |
00:26:20.27 |
+29:22:13.2 |
HIP 2133 |
20.79 |
| 2026-05-14 12:00 |
00:26:21.46 |
+29:22:27.0 |
HIP 2133 |
20.88 |
| 2026-05-15 00:00 |
00:26:22.64 |
+29:22:40.9 |
HIP 2133 |
20.97 |
| 2026-05-15 12:00 |
00:26:23.81 |
+29:22:54.9 |
HIP 2133 |
21.07 |
| 2026-05-16 00:00 |
00:26:24.97 |
+29:23:08.8 |
HIP 2133 |
21.18 |
| 2026-05-16 12:00 |
00:26:26.12 |
+29:23:22.7 |
HIP 2133 |
21.30 |
| 2026-05-17 00:00 |
00:26:27.26 |
+29:23:36.6 |
HIP 2133 |
21.42 |
| 2026-05-17 12:00 |
00:26:28.39 |
+29:23:50.6 |
HIP 2133 |
21.54 |
| 2026-05-18 00:00 |
00:26:29.50 |
+29:24:04.5 |
HIP 2133 |
21.67 |
| 2026-05-18 12:00 |
00:26:30.61 |
+29:24:18.5 |
HIP 2133 |
21.81 |
| 2026-05-19 00:00 |
00:26:31.71 |
+29:24:32.4 |
HIP 2133 |
21.95 |
| 2026-05-19 12:00 |
00:26:32.79 |
+29:24:46.4 |
HIP 2133 |
22.10 |
| 2026-05-20 00:00 |
00:26:33.87 |
+29:25:00.4 |
HIP 2133 |
22.25 |
| 2026-05-20 12:00 |
00:26:34.93 |
+29:25:14.3 |
HIP 2133 |
22.40 |
| 2026-05-21 00:00 |
00:26:35.99 |
+29:25:28.3 |
HIP 2133 |
22.56 |
| 2026-05-21 12:00 |
00:26:37.03 |
+29:25:42.2 |
HIP 2133 |
22.73 |
| 2026-05-22 00:00 |
00:26:38.06 |
+29:25:56.2 |
HIP 2133 |
22.90 |
| 2026-05-22 12:00 |
00:26:39.08 |
+29:26:10.2 |
HIP 2133 |
23.07 |
| 2026-05-23 00:00 |
00:26:40.09 |
+29:26:24.1 |
HIP 2133 |
23.24 |
| 2026-05-23 12:00 |
00:26:41.08 |
+29:26:38.1 |
HIP 2133 |
23.42 |
| 2026-05-24 00:00 |
00:26:42.07 |
+29:26:52.0 |
HIP 2133 |
23.61 |
| 2026-05-24 12:00 |
00:26:43.04 |
+29:27:05.9 |
HIP 2133 |
23.79 |
| 2026-05-25 00:00 |
00:26:44.00 |
+29:27:19.9 |
HIP 2133 |
23.98 |
| 2026-05-25 12:00 |
00:26:44.95 |
+29:27:33.8 |
HIP 2133 |
24.17 |
| 2026-05-26 00:00 |
00:26:45.89 |
+29:27:47.7 |
HIP 2133 |
24.37 |
| 2026-05-26 12:00 |
00:26:46.82 |
+29:28:01.6 |
HIP 2133 |
24.56 |
| 2026-05-27 00:00 |
00:26:47.74 |
+29:28:15.5 |
HIP 2133 |
24.76 |
| 2026-05-27 12:00 |
00:26:48.64 |
+29:28:29.3 |
HIP 2133 |
24.96 |
| 2026-05-28 00:00 |
00:26:49.53 |
+29:28:43.2 |
HIP 2133 |
25.17 |
| 2026-05-28 12:00 |
00:26:50.41 |
+29:28:57.1 |
HIP 2133 |
25.37 |
| 2026-05-29 00:00 |
00:26:51.28 |
+29:29:10.9 |
HIP 2133 |
25.58 |
| 2026-05-29 12:00 |
00:26:52.13 |
+29:29:24.7 |
HIP 2133 |
25.79 |
| 2026-05-30 00:00 |
00:26:52.98 |
+29:29:38.5 |
HIP 2133 |
26.00 |
| 2026-05-30 12:00 |
00:26:53.81 |
+29:29:52.3 |
HIP 2133 |
26.22 |
| 2026-05-31 00:00 |
00:26:54.63 |
+29:30:06.1 |
HIP 2133 |
26.43 |
| 2026-05-31 12:00 |
00:26:55.44 |
+29:30:19.8 |
HIP 2133 |
26.65 |
| 2026-06-01 00:00 |
00:26:56.23 |
+29:30:33.5 |
HIP 2133 |
26.86 |
| 2026-06-01 12:00 |
00:26:57.01 |
+29:30:47.2 |
HIP 2133 |
27.08 |
| 2026-06-02 00:00 |
00:26:57.78 |
+29:31:00.9 |
HIP 2133 |
27.30 |