メタデータ
| 項目 |
値 |
| Designation |
C/1947 Y1 (Mrkos) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1948-02-16T15:01:24.922560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
4 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1948-10-12.0000000 |
| e |
1.00041232 |
| q (au) |
1.499710 |
| a (au) |
-3637.212894 |
| i (deg) |
77.512349 |
| Ω (om, deg) |
199.310414 |
| ω (w, deg) |
61.913458 |
| M (ma, deg) |
0.001071 |
等級
散乱 + 全体線形
$$
M_a = (6.993 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.993 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.777 |
| k |
0.965 |
| 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) |
| 2026-09-20 00:00 |
03:12:00.65 |
-31:20:54.0 |
HIP 14940 |
15.33 |
| 2026-09-20 12:00 |
03:11:59.86 |
-31:21:06.6 |
HIP 14940 |
15.60 |
| 2026-09-21 00:00 |
03:11:59.06 |
-31:21:19.2 |
HIP 14940 |
15.87 |
| 2026-09-21 12:00 |
03:11:58.25 |
-31:21:31.7 |
HIP 14940 |
16.14 |
| 2026-09-22 00:00 |
03:11:57.44 |
-31:21:44.2 |
HIP 14940 |
16.41 |
| 2026-09-22 12:00 |
03:11:56.61 |
-31:21:56.7 |
HIP 14940 |
16.67 |
| 2026-09-23 00:00 |
03:11:55.78 |
-31:22:09.0 |
HIP 14940 |
16.94 |
| 2026-09-23 12:00 |
03:11:54.94 |
-31:22:21.4 |
HIP 14940 |
17.21 |
| 2026-09-24 00:00 |
03:11:54.09 |
-31:22:33.6 |
HIP 14940 |
17.48 |
| 2026-09-24 12:00 |
03:11:53.23 |
-31:22:45.9 |
HIP 14940 |
17.75 |
| 2026-09-25 00:00 |
03:11:52.36 |
-31:22:58.0 |
HIP 14940 |
18.02 |
| 2026-09-25 12:00 |
03:11:51.48 |
-31:23:10.1 |
HIP 14940 |
18.29 |
| 2026-09-26 00:00 |
03:11:50.60 |
-31:23:22.2 |
HIP 14940 |
18.57 |
| 2026-09-26 12:00 |
03:11:49.70 |
-31:23:34.2 |
HIP 14940 |
18.84 |
| 2026-09-27 00:00 |
03:11:48.80 |
-31:23:46.1 |
HIP 14940 |
19.11 |
| 2026-09-27 12:00 |
03:11:47.89 |
-31:23:58.0 |
HIP 14940 |
19.38 |
| 2026-09-28 00:00 |
03:11:46.97 |
-31:24:09.9 |
HIP 14904 |
19.52 |
| 2026-09-28 12:00 |
03:11:46.04 |
-31:24:21.6 |
HIP 14904 |
19.42 |
| 2026-09-29 00:00 |
03:11:45.11 |
-31:24:33.3 |
HIP 14904 |
19.32 |
| 2026-09-29 12:00 |
03:11:44.16 |
-31:24:45.0 |
HIP 14904 |
19.22 |
| 2026-09-30 00:00 |
03:11:43.21 |
-31:24:56.5 |
HIP 14904 |
19.13 |
| 2026-09-30 12:00 |
03:11:42.25 |
-31:25:08.1 |
HIP 14904 |
19.05 |
| 2026-10-01 00:00 |
03:11:41.29 |
-31:25:19.5 |
HIP 14904 |
18.97 |
| 2026-10-01 12:00 |
03:11:40.31 |
-31:25:30.9 |
HIP 14904 |
18.89 |
| 2026-10-02 00:00 |
03:11:39.33 |
-31:25:42.2 |
HIP 14904 |
18.82 |
| 2026-10-02 12:00 |
03:11:38.34 |
-31:25:53.5 |
HIP 14904 |
18.76 |
| 2026-10-03 00:00 |
03:11:37.34 |
-31:26:04.6 |
HIP 14904 |
18.71 |
| 2026-10-03 12:00 |
03:11:36.33 |
-31:26:15.7 |
HIP 14904 |
18.66 |
| 2026-10-04 00:00 |
03:11:35.32 |
-31:26:26.8 |
HIP 14904 |
18.61 |
| 2026-10-04 12:00 |
03:11:34.30 |
-31:26:37.8 |
HIP 14904 |
18.57 |
| 2026-10-05 00:00 |
03:11:33.27 |
-31:26:48.7 |
HIP 14904 |
18.54 |
| 2026-10-05 12:00 |
03:11:32.24 |
-31:26:59.5 |
HIP 14904 |
18.51 |
| 2026-10-06 00:00 |
03:11:31.19 |
-31:27:10.2 |
HIP 14904 |
18.50 |
| 2026-10-06 12:00 |
03:11:30.14 |
-31:27:20.9 |
HIP 14904 |
18.48 |
| 2026-10-07 00:00 |
03:11:29.08 |
-31:27:31.5 |
HIP 14904 |
18.47 |
| 2026-10-07 12:00 |
03:11:28.02 |
-31:27:42.1 |
HIP 14904 |
18.47 |
| 2026-10-08 00:00 |
03:11:26.95 |
-31:27:52.5 |
HIP 14904 |
18.48 |
| 2026-10-08 12:00 |
03:11:25.87 |
-31:28:02.9 |
HIP 14904 |
18.49 |
| 2026-10-09 00:00 |
03:11:24.79 |
-31:28:13.2 |
HIP 14904 |
18.51 |
| 2026-10-09 12:00 |
03:11:23.69 |
-31:28:23.4 |
HIP 14904 |
18.53 |
| 2026-10-10 00:00 |
03:11:22.60 |
-31:28:33.5 |
HIP 14904 |
18.57 |
| 2026-10-10 12:00 |
03:11:21.49 |
-31:28:43.6 |
HIP 14904 |
18.60 |
| 2026-10-11 00:00 |
03:11:20.38 |
-31:28:53.5 |
HIP 14904 |
18.65 |