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) |
| 2026-03-26 00:00 |
07:39:48.09 |
-37:17:06.2 |
HIP 37348 |
5.79 |
| 2026-03-26 12:00 |
07:39:46.40 |
-37:16:22.7 |
HIP 37348 |
6.58 |
| 2026-03-27 00:00 |
07:39:44.76 |
-37:15:39.2 |
HIP 37348 |
7.38 |
| 2026-03-27 12:00 |
07:39:43.15 |
-37:14:55.6 |
HIP 37348 |
8.17 |
| 2026-03-28 00:00 |
07:39:41.58 |
-37:14:12.0 |
HIP 37348 |
8.96 |
| 2026-03-28 12:00 |
07:39:40.05 |
-37:13:28.3 |
HIP 37348 |
9.75 |
| 2026-03-29 00:00 |
07:39:38.55 |
-37:12:44.5 |
HIP 37348 |
10.54 |
| 2026-03-29 12:00 |
07:39:37.10 |
-37:12:00.7 |
HIP 37348 |
11.33 |
| 2026-03-30 00:00 |
07:39:35.68 |
-37:11:16.9 |
HIP 37348 |
12.11 |
| 2026-03-30 12:00 |
07:39:34.29 |
-37:10:33.0 |
HIP 37348 |
12.89 |
| 2026-03-31 00:00 |
07:39:32.95 |
-37:09:49.1 |
HIP 37348 |
13.67 |
| 2026-03-31 12:00 |
07:39:31.64 |
-37:09:05.1 |
HIP 37348 |
14.45 |
| 2026-04-01 00:00 |
07:39:30.37 |
-37:08:21.1 |
HIP 37348 |
15.22 |
| 2026-04-01 12:00 |
07:39:29.13 |
-37:07:37.1 |
HIP 37348 |
15.99 |
| 2026-04-02 00:00 |
07:39:27.94 |
-37:06:53.1 |
HIP 37348 |
16.77 |
| 2026-04-02 12:00 |
07:39:26.78 |
-37:06:09.0 |
HIP 37348 |
17.53 |
| 2026-04-03 00:00 |
07:39:25.66 |
-37:05:25.0 |
HIP 37348 |
18.30 |
| 2026-04-03 12:00 |
07:39:24.58 |
-37:04:40.9 |
HIP 37348 |
19.06 |
| 2026-04-04 00:00 |
07:39:23.53 |
-37:03:56.8 |
HIP 37348 |
19.82 |
| 2026-04-04 12:00 |
07:39:22.52 |
-37:03:12.7 |
HIP 37348 |
20.58 |
| 2026-04-05 00:00 |
07:39:21.55 |
-37:02:28.6 |
HIP 37348 |
21.34 |
| 2026-04-05 12:00 |
07:39:20.62 |
-37:01:44.5 |
HIP 37348 |
22.09 |
| 2026-04-06 00:00 |
07:39:19.72 |
-37:01:00.3 |
HIP 37430 |
21.96 |
| 2026-04-06 12:00 |
07:39:18.86 |
-37:00:16.2 |
HIP 37430 |
21.84 |
| 2026-04-07 00:00 |
07:39:18.04 |
-36:59:32.2 |
HIP 37430 |
21.73 |
| 2026-04-07 12:00 |
07:39:17.26 |
-36:58:48.1 |
HIP 37430 |
21.64 |
| 2026-04-08 00:00 |
07:39:16.51 |
-36:58:04.0 |
HIP 37430 |
21.57 |
| 2026-04-08 12:00 |
07:39:15.81 |
-36:57:20.0 |
HIP 37430 |
21.51 |
| 2026-04-09 00:00 |
07:39:15.14 |
-36:56:35.9 |
HIP 37430 |
21.48 |
| 2026-04-09 12:00 |
07:39:14.50 |
-36:55:51.9 |
HIP 37430 |
21.47 |
| 2026-04-10 00:00 |
07:39:13.91 |
-36:55:08.0 |
HIP 37430 |
21.47 |
| 2026-04-10 12:00 |
07:39:13.35 |
-36:54:24.0 |
HIP 37430 |
21.49 |
| 2026-04-11 00:00 |
07:39:12.83 |
-36:53:40.1 |
HIP 37430 |
21.53 |
| 2026-04-11 12:00 |
07:39:12.35 |
-36:52:56.3 |
HIP 37430 |
21.59 |
| 2026-04-12 00:00 |
07:39:11.90 |
-36:52:12.5 |
HIP 37430 |
21.66 |
| 2026-04-12 12:00 |
07:39:11.50 |
-36:51:28.7 |
HIP 37430 |
21.76 |
| 2026-04-13 00:00 |
07:39:11.13 |
-36:50:45.0 |
HIP 37223 |
21.64 |
| 2026-04-13 12:00 |
07:39:10.79 |
-36:50:01.3 |
HIP 37223 |
20.92 |
| 2026-04-14 00:00 |
07:39:10.50 |
-36:49:17.7 |
HIP 37223 |
20.20 |
| 2026-04-14 12:00 |
07:39:10.24 |
-36:48:34.1 |
HIP 37223 |
19.49 |
| 2026-04-15 00:00 |
07:39:10.02 |
-36:47:50.6 |
HIP 37223 |
18.78 |
| 2026-04-15 12:00 |
07:39:09.84 |
-36:47:07.2 |
HIP 37223 |
18.07 |
| 2026-04-16 00:00 |
07:39:09.69 |
-36:46:23.9 |
HIP 37223 |
17.38 |