メタデータ
| 項目 |
値 |
| Designation |
C/2008 N1 (Holmes) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-09-25T21:06:06.120000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:21Z |
| Obs used |
1522 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-06-22.0000000 |
| e |
0.99713966 |
| q (au) |
2.783511 |
| a (au) |
973.139852 |
| i (deg) |
115.521017 |
| Ω (om, deg) |
357.472211 |
| ω (w, deg) |
100.813452 |
| M (ma, deg) |
359.996887 |
等級
散乱 + 全体線形
$$
M_a = (11.312 + 2.390\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.312 |
| n |
2.390 |
| gf |
1.000 |
| gb |
-0.883 |
| k |
0.999 |
| 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 |
| 2008-07-01 |
2009-05-02 |
+2.0960 |
-1.501 |
| 2009-05-02 |
2009-09-25 |
+0.0188 |
-0.150 |
| 2009-09-26 |
2010-02-20 |
+7.1027 |
-3.886 |
| 2010-02-20 |
2010-06-30 |
+5.8832 |
-3.022 |
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) |
| 2026-09-20 00:00 |
07:53:13.98 |
-36:32:25.8 |
HIP 38497 |
10.81 |
| 2026-09-20 12:00 |
07:53:15.65 |
-36:33:07.2 |
HIP 38497 |
11.55 |
| 2026-09-21 00:00 |
07:53:17.29 |
-36:33:48.7 |
HIP 38497 |
12.30 |
| 2026-09-21 12:00 |
07:53:18.91 |
-36:34:30.3 |
HIP 38497 |
13.05 |
| 2026-09-22 00:00 |
07:53:20.49 |
-36:35:12.1 |
HIP 38497 |
13.80 |
| 2026-09-22 12:00 |
07:53:22.04 |
-36:35:54.0 |
HIP 38497 |
14.56 |
| 2026-09-23 00:00 |
07:53:23.56 |
-36:36:36.1 |
HIP 38497 |
15.31 |
| 2026-09-23 12:00 |
07:53:25.05 |
-36:37:18.2 |
HIP 38497 |
16.07 |
| 2026-09-24 00:00 |
07:53:26.51 |
-36:38:00.5 |
HIP 38497 |
16.83 |
| 2026-09-24 12:00 |
07:53:27.93 |
-36:38:42.9 |
HIP 38544 |
17.49 |
| 2026-09-25 00:00 |
07:53:29.33 |
-36:39:25.5 |
HIP 38544 |
16.77 |
| 2026-09-25 12:00 |
07:53:30.69 |
-36:40:08.1 |
HIP 38544 |
16.04 |
| 2026-09-26 00:00 |
07:53:32.02 |
-36:40:50.9 |
HIP 38544 |
15.32 |
| 2026-09-26 12:00 |
07:53:33.32 |
-36:41:33.7 |
HIP 38544 |
14.61 |
| 2026-09-27 00:00 |
07:53:34.59 |
-36:42:16.7 |
HIP 38544 |
13.89 |
| 2026-09-27 12:00 |
07:53:35.83 |
-36:42:59.8 |
HIP 38544 |
13.18 |
| 2026-09-28 00:00 |
07:53:37.03 |
-36:43:43.0 |
HIP 38544 |
12.47 |
| 2026-09-28 12:00 |
07:53:38.20 |
-36:44:26.3 |
HIP 38544 |
11.77 |
| 2026-09-29 00:00 |
07:53:39.34 |
-36:45:09.6 |
HIP 38544 |
11.07 |
| 2026-09-29 12:00 |
07:53:40.45 |
-36:45:53.1 |
HIP 38544 |
10.37 |
| 2026-09-30 00:00 |
07:53:41.52 |
-36:46:36.7 |
HIP 38544 |
9.69 |
| 2026-09-30 12:00 |
07:53:42.56 |
-36:47:20.3 |
HIP 38544 |
9.01 |
| 2026-10-01 00:00 |
07:53:43.57 |
-36:48:04.1 |
HIP 38544 |
8.34 |
| 2026-10-01 12:00 |
07:53:44.54 |
-36:48:47.9 |
HIP 38544 |
7.69 |
| 2026-10-02 00:00 |
07:53:45.49 |
-36:49:31.8 |
HIP 38544 |
7.05 |
| 2026-10-02 12:00 |
07:53:46.39 |
-36:50:15.8 |
HIP 38544 |
6.43 |
| 2026-10-03 00:00 |
07:53:47.27 |
-36:50:59.9 |
HIP 38544 |
5.84 |
| 2026-10-03 12:00 |
07:53:48.11 |
-36:51:44.0 |
HIP 38544 |
5.29 |
| 2026-10-04 00:00 |
07:53:48.91 |
-36:52:28.2 |
HIP 38544 |
4.79 |
| 2026-10-04 12:00 |
07:53:49.68 |
-36:53:12.5 |
HIP 38544 |
4.36 |
| 2026-10-05 00:00 |
07:53:50.42 |
-36:53:56.9 |
HIP 38544 |
4.02 |
| 2026-10-05 12:00 |
07:53:51.12 |
-36:54:41.3 |
HIP 38544 |
3.79 |
| 2026-10-06 00:00 |
07:53:51.79 |
-36:55:25.7 |
HIP 38544 |
3.70 |
| 2026-10-06 12:00 |
07:53:52.43 |
-36:56:10.2 |
HIP 38544 |
3.75 |
| 2026-10-07 00:00 |
07:53:53.02 |
-36:56:54.8 |
HIP 38544 |
3.94 |
| 2026-10-07 12:00 |
07:53:53.59 |
-36:57:39.4 |
HIP 38544 |
4.25 |
| 2026-10-08 00:00 |
07:53:54.12 |
-36:58:24.1 |
HIP 38544 |
4.66 |
| 2026-10-08 12:00 |
07:53:54.61 |
-36:59:08.8 |
HIP 38544 |
5.14 |
| 2026-10-09 00:00 |
07:53:55.07 |
-36:59:53.5 |
HIP 38544 |
5.67 |
| 2026-10-09 12:00 |
07:53:55.49 |
-37:00:38.3 |
HIP 38544 |
6.25 |
| 2026-10-10 00:00 |
07:53:55.88 |
-37:01:23.1 |
HIP 38544 |
6.85 |
| 2026-10-10 12:00 |
07:53:56.24 |
-37:02:07.9 |
HIP 38544 |
7.48 |
| 2026-10-11 00:00 |
07:53:56.55 |
-37:02:52.8 |
HIP 38544 |
8.12 |