メタデータ
| 項目 |
値 |
| Designation |
C/2023 H2 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-10-29T04:33:37.779840Z |
| Orbit solution date (soln_date, UTC) |
2024-07-30T14:57:25Z |
| Obs used |
724 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
5.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-04-23T06:42:47.548800Z |
| Discovery magnitude (MPC) |
20.78 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2023-10-07.0000000 |
| e |
0.99628184 |
| q (au) |
0.894405 |
| a (au) |
240.550492 |
| i (deg) |
113.753483 |
| Ω (om, deg) |
217.044806 |
| ω (w, deg) |
150.650349 |
| M (ma, deg) |
359.994138 |
等級
散乱 + 全体線形
$$
M_a = (13.783 + 4.803\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.783 |
| n |
4.803 |
| gf |
0.800 |
| gb |
-0.500 |
| 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 |
| 2023-03-26 |
2023-10-28 |
+3.5183 |
-1.258 |
| 2023-10-29 |
2024-02-05 |
-12.4077 |
-0.879 |
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) |
| 2026-07-29 00:00 |
13:56:56.56 |
-76:31:13.0 |
HIP 67986 |
15.99 |
| 2026-07-29 12:00 |
13:57:02.93 |
-76:28:13.2 |
HIP 67986 |
13.40 |
| 2026-07-30 00:00 |
13:57:09.64 |
-76:25:14.1 |
HIP 67986 |
11.04 |
| 2026-07-30 12:00 |
13:57:16.68 |
-76:22:15.6 |
HIP 67986 |
9.10 |
| 2026-07-31 00:00 |
13:57:24.06 |
-76:19:17.7 |
HIP 67986 |
7.89 |
| 2026-07-31 12:00 |
13:57:31.77 |
-76:16:20.4 |
HIP 67986 |
7.74 |
| 2026-08-01 00:00 |
13:57:39.80 |
-76:13:23.7 |
HIP 67986 |
8.71 |
| 2026-08-01 12:00 |
13:57:48.14 |
-76:10:27.7 |
HIP 67986 |
10.48 |
| 2026-08-02 00:00 |
13:57:56.81 |
-76:07:32.3 |
HIP 67986 |
12.72 |
| 2026-08-02 12:00 |
13:58:05.78 |
-76:04:37.6 |
HIP 67986 |
15.21 |
| 2026-08-03 00:00 |
13:58:15.07 |
-76:01:43.5 |
HIP 67986 |
17.86 |
| 2026-08-03 12:00 |
13:58:24.65 |
-75:58:50.1 |
HIP 67986 |
20.59 |
| 2026-08-04 00:00 |
13:58:34.54 |
-75:55:57.4 |
HIP 67986 |
23.37 |
| 2026-08-04 12:00 |
13:58:44.72 |
-75:53:05.3 |
HIP 67986 |
26.19 |
| 2026-08-05 00:00 |
13:58:55.19 |
-75:50:13.9 |
HIP 68894 |
28.17 |
| 2026-08-05 12:00 |
13:59:05.95 |
-75:47:23.3 |
HIP 68894 |
27.05 |
| 2026-08-06 00:00 |
13:59:17.00 |
-75:44:33.3 |
HIP 68894 |
26.18 |
| 2026-08-06 12:00 |
13:59:28.33 |
-75:41:44.0 |
HIP 68894 |
25.60 |
| 2026-08-07 00:00 |
13:59:39.93 |
-75:38:55.5 |
HIP 68894 |
25.31 |
| 2026-08-07 12:00 |
13:59:51.81 |
-75:36:07.7 |
HIP 68894 |
25.33 |
| 2026-08-08 00:00 |
14:00:03.97 |
-75:33:20.6 |
HIP 68894 |
25.65 |
| 2026-08-08 12:00 |
14:00:16.39 |
-75:30:34.3 |
HIP 68894 |
26.26 |
| 2026-08-09 00:00 |
14:00:29.07 |
-75:27:48.7 |
HIP 68894 |
27.14 |
| 2026-08-09 12:00 |
14:00:42.02 |
-75:25:03.8 |
HIP 68894 |
28.26 |
| 2026-08-10 00:00 |
14:00:55.22 |
-75:22:19.8 |
HIP 68894 |
29.59 |
| 2026-08-10 12:00 |
14:01:08.68 |
-75:19:36.4 |
HIP 68894 |
31.11 |
| 2026-08-11 00:00 |
14:01:22.39 |
-75:16:53.9 |
HIP 68894 |
32.78 |
| 2026-08-11 12:00 |
14:01:36.35 |
-75:14:12.2 |
HIP 68894 |
34.58 |
| 2026-08-12 00:00 |
14:01:50.56 |
-75:11:31.2 |
HIP 69090 |
32.83 |
| 2026-08-12 12:00 |
14:02:05.01 |
-75:08:51.0 |
HIP 69090 |
30.50 |
| 2026-08-13 00:00 |
14:02:19.70 |
-75:06:11.7 |
HIP 69090 |
28.25 |
| 2026-08-13 12:00 |
14:02:34.62 |
-75:03:33.1 |
HIP 69090 |
26.10 |
| 2026-08-14 00:00 |
14:02:49.78 |
-75:00:55.4 |
HIP 69090 |
24.08 |
| 2026-08-14 12:00 |
14:03:05.17 |
-74:58:18.5 |
HIP 69090 |
22.21 |
| 2026-08-15 00:00 |
14:03:20.78 |
-74:55:42.4 |
HIP 69090 |
20.54 |
| 2026-08-15 12:00 |
14:03:36.62 |
-74:53:07.1 |
HIP 69090 |
19.11 |
| 2026-08-16 00:00 |
14:03:52.68 |
-74:50:32.7 |
HIP 69002 |
17.29 |
| 2026-08-16 12:00 |
14:04:08.95 |
-74:47:59.1 |
HIP 69002 |
15.13 |
| 2026-08-17 00:00 |
14:04:25.44 |
-74:45:26.4 |
HIP 69002 |
13.19 |
| 2026-08-17 12:00 |
14:04:42.14 |
-74:42:54.5 |
HIP 69002 |
11.56 |
| 2026-08-18 00:00 |
14:04:59.06 |
-74:40:23.5 |
HIP 69002 |
10.40 |
| 2026-08-18 12:00 |
14:05:16.17 |
-74:37:53.3 |
HIP 69002 |
9.87 |
| 2026-08-19 00:00 |
14:05:33.49 |
-74:35:24.0 |
HIP 68972 |
9.01 |