メタデータ
| 項目 |
値 |
| Designation |
18D/Perrine-Mrkos |
| Type |
D |
| Perihelion (tp_cal, UTC) |
1968-11-01T13:00:40.325760Z |
| Orbit solution date (soln_date, UTC) |
2002-02-22T17:02:43Z |
| Obs used |
16 |
| NEO |
Yes |
| M1 |
11.500 |
| K1 |
20.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1969-01-19.0000000 |
| e |
0.64258098 |
| q (au) |
1.272248 |
| a (au) |
3.559542 |
| i (deg) |
17.758983 |
| Ω (om, deg) |
240.875547 |
| ω (w, deg) |
166.050417 |
| M (ma, deg) |
11.514613 |
等級
散乱 + 全体線形
$$
M_a = (12.123 + 4.437\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.123 |
| n |
4.437 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
09:59:08.65 |
-04:44:34.8 |
HIP 49021 |
21.24 |
| 2026-06-01 12:00 |
09:59:25.40 |
-04:44:06.2 |
HIP 49021 |
19.22 |
| 2026-06-02 00:00 |
09:59:42.28 |
-04:43:38.9 |
HIP 49021 |
17.94 |
| 2026-06-02 12:00 |
09:59:59.30 |
-04:43:13.0 |
HIP 49021 |
17.58 |
| 2026-06-03 00:00 |
10:00:16.44 |
-04:42:48.5 |
HIP 49021 |
18.23 |
| 2026-06-03 12:00 |
10:00:33.72 |
-04:42:25.5 |
HIP 49021 |
19.79 |
| 2026-06-04 00:00 |
10:00:51.12 |
-04:42:03.8 |
HIP 49021 |
22.10 |
| 2026-06-04 12:00 |
10:01:08.66 |
-04:41:43.6 |
HIP 49021 |
24.96 |
| 2026-06-05 00:00 |
10:01:26.32 |
-04:41:24.7 |
HIP 49072 |
26.65 |
| 2026-06-05 12:00 |
10:01:44.10 |
-04:41:07.2 |
HIP 49072 |
27.98 |
| 2026-06-06 00:00 |
10:02:02.01 |
-04:40:51.1 |
HIP 49072 |
29.96 |
| 2026-06-06 12:00 |
10:02:20.04 |
-04:40:36.3 |
HIP 49072 |
32.48 |
| 2026-06-07 00:00 |
10:02:38.19 |
-04:40:23.0 |
HIP 49072 |
35.43 |
| 2026-06-07 12:00 |
10:02:56.46 |
-04:40:11.0 |
HIP 49072 |
38.72 |
| 2026-06-08 00:00 |
10:03:14.86 |
-04:40:00.4 |
HIP 49072 |
42.29 |
| 2026-06-08 12:00 |
10:03:33.37 |
-04:39:51.1 |
HIP 49072 |
46.07 |
| 2026-06-09 00:00 |
10:03:52.00 |
-04:39:43.2 |
HIP 49072 |
50.03 |
| 2026-06-09 12:00 |
10:04:10.75 |
-04:39:36.6 |
HIP 49465 |
52.63 |
| 2026-06-10 00:00 |
10:04:29.61 |
-04:39:31.4 |
HIP 49465 |
50.55 |
| 2026-06-10 12:00 |
10:04:48.59 |
-04:39:27.5 |
HIP 49465 |
48.81 |
| 2026-06-11 00:00 |
10:05:07.68 |
-04:39:25.0 |
HIP 49465 |
47.45 |
| 2026-06-11 12:00 |
10:05:26.88 |
-04:39:23.7 |
HIP 49465 |
46.52 |
| 2026-06-12 00:00 |
10:05:46.20 |
-04:39:23.9 |
HIP 49465 |
46.04 |
| 2026-06-12 12:00 |
10:06:05.62 |
-04:39:25.3 |
HIP 49465 |
46.03 |
| 2026-06-13 00:00 |
10:06:25.16 |
-04:39:28.1 |
HIP 49684 |
44.16 |
| 2026-06-13 12:00 |
10:06:44.80 |
-04:39:32.2 |
HIP 49684 |
40.83 |
| 2026-06-14 00:00 |
10:07:04.55 |
-04:39:37.6 |
HIP 49684 |
37.84 |
| 2026-06-14 12:00 |
10:07:24.41 |
-04:39:44.3 |
HIP 49684 |
35.30 |
| 2026-06-15 00:00 |
10:07:44.38 |
-04:39:52.3 |
HIP 49684 |
33.32 |
| 2026-06-15 12:00 |
10:08:04.44 |
-04:40:01.6 |
HIP 49684 |
32.01 |
| 2026-06-16 00:00 |
10:08:24.61 |
-04:40:12.2 |
HIP 49684 |
31.47 |
| 2026-06-16 12:00 |
10:08:44.89 |
-04:40:24.1 |
HIP 49684 |
31.75 |
| 2026-06-17 00:00 |
10:09:05.26 |
-04:40:37.3 |
HIP 49684 |
32.85 |
| 2026-06-17 12:00 |
10:09:25.73 |
-04:40:51.7 |
HIP 49862 |
30.93 |
| 2026-06-18 00:00 |
10:09:46.30 |
-04:41:07.4 |
HIP 49862 |
27.68 |
| 2026-06-18 12:00 |
10:10:06.97 |
-04:41:24.4 |
HIP 49862 |
25.06 |
| 2026-06-19 00:00 |
10:10:27.73 |
-04:41:42.7 |
HIP 49862 |
23.33 |
| 2026-06-19 12:00 |
10:10:48.59 |
-04:42:02.1 |
HIP 49862 |
22.69 |
| 2026-06-20 00:00 |
10:11:09.54 |
-04:42:22.9 |
HIP 49862 |
23.25 |
| 2026-06-20 12:00 |
10:11:30.59 |
-04:42:44.8 |
HIP 49862 |
24.95 |
| 2026-06-21 00:00 |
10:11:51.73 |
-04:43:08.0 |
HIP 49862 |
27.60 |
| 2026-06-21 12:00 |
10:12:12.95 |
-04:43:32.4 |
HIP 50084 |
29.19 |
| 2026-06-22 00:00 |
10:12:34.27 |
-04:43:58.1 |
HIP 50084 |
25.58 |