C/2008 N1 (Holmes)
메타데이터
| 항목 |
값 |
| 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 |
- |
Osculating 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (11.312 + 2.390\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.312 |
| n |
2.390 |
| gf |
1.000 |
| gb |
-0.883 |
| k |
0.999 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (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(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
07:45:29.72 |
-38:14:38.9 |
HIP 37819 |
16.77 |
| 2026-02-03 12:00 |
07:45:25.12 |
-38:14:19.8 |
HIP 37819 |
16.33 |
| 2026-02-04 00:00 |
07:45:20.54 |
-38:14:00.4 |
HIP 37819 |
15.92 |
| 2026-02-04 12:00 |
07:45:15.97 |
-38:13:40.6 |
HIP 37819 |
15.56 |
| 2026-02-05 00:00 |
07:45:11.42 |
-38:13:20.4 |
HIP 37819 |
15.24 |
| 2026-02-05 12:00 |
07:45:06.89 |
-38:12:59.9 |
HIP 37819 |
14.97 |
| 2026-02-06 00:00 |
07:45:02.37 |
-38:12:38.9 |
HIP 37819 |
14.75 |
| 2026-02-06 12:00 |
07:44:57.86 |
-38:12:17.6 |
HIP 37819 |
14.59 |
| 2026-02-07 00:00 |
07:44:53.38 |
-38:11:56.0 |
HIP 37666 |
13.84 |
| 2026-02-07 12:00 |
07:44:48.91 |
-38:11:34.0 |
HIP 37666 |
12.97 |
| 2026-02-08 00:00 |
07:44:44.45 |
-38:11:11.6 |
HIP 37666 |
12.12 |
| 2026-02-08 12:00 |
07:44:40.02 |
-38:10:48.8 |
HIP 37666 |
11.29 |
| 2026-02-09 00:00 |
07:44:35.60 |
-38:10:25.7 |
HIP 37666 |
10.49 |
| 2026-02-09 12:00 |
07:44:31.21 |
-38:10:02.3 |
HIP 37666 |
9.71 |
| 2026-02-10 00:00 |
07:44:26.83 |
-38:09:38.4 |
HIP 37666 |
8.97 |
| 2026-02-10 12:00 |
07:44:22.47 |
-38:09:14.3 |
HIP 37666 |
8.29 |
| 2026-02-11 00:00 |
07:44:18.13 |
-38:08:49.7 |
HIP 37666 |
7.66 |
| 2026-02-11 12:00 |
07:44:13.81 |
-38:08:24.9 |
HIP 37666 |
7.11 |
| 2026-02-12 00:00 |
07:44:09.51 |
-38:07:59.6 |
HIP 37666 |
6.65 |
| 2026-02-12 12:00 |
07:44:05.23 |
-38:07:34.1 |
HIP 37666 |
6.32 |
| 2026-02-13 00:00 |
07:44:00.97 |
-38:07:08.2 |
HIP 37666 |
6.11 |
| 2026-02-13 12:00 |
07:43:56.73 |
-38:06:41.9 |
HIP 37666 |
6.06 |
| 2026-02-14 00:00 |
07:43:52.51 |
-38:06:15.3 |
HIP 37666 |
6.16 |
| 2026-02-14 12:00 |
07:43:48.32 |
-38:05:48.4 |
HIP 37666 |
6.40 |
| 2026-02-15 00:00 |
07:43:44.15 |
-38:05:21.1 |
HIP 37666 |
6.77 |
| 2026-02-15 12:00 |
07:43:40.00 |
-38:04:53.6 |
HIP 37666 |
7.25 |
| 2026-02-16 00:00 |
07:43:35.87 |
-38:04:25.7 |
HIP 37666 |
7.81 |
| 2026-02-16 12:00 |
07:43:31.77 |
-38:03:57.4 |
HIP 37666 |
8.45 |
| 2026-02-17 00:00 |
07:43:27.69 |
-38:03:28.9 |
HIP 37666 |
9.14 |
| 2026-02-17 12:00 |
07:43:23.63 |
-38:03:00.0 |
HIP 37666 |
9.87 |
| 2026-02-18 00:00 |
07:43:19.60 |
-38:02:30.8 |
HIP 37666 |
10.64 |
| 2026-02-18 12:00 |
07:43:15.59 |
-38:02:01.3 |
HIP 37666 |
11.44 |
| 2026-02-19 00:00 |
07:43:11.61 |
-38:01:31.5 |
HIP 37666 |
12.25 |
| 2026-02-19 12:00 |
07:43:07.65 |
-38:01:01.4 |
HIP 37666 |
13.08 |
| 2026-02-20 00:00 |
07:43:03.72 |
-38:00:30.9 |
HIP 37666 |
13.93 |
| 2026-02-20 12:00 |
07:42:59.81 |
-38:00:00.2 |
HIP 37666 |
14.79 |
| 2026-02-21 00:00 |
07:42:55.93 |
-37:59:29.2 |
HIP 37666 |
15.65 |
| 2026-02-21 12:00 |
07:42:52.08 |
-37:58:57.9 |
HIP 37666 |
16.52 |
| 2026-02-22 00:00 |
07:42:48.25 |
-37:58:26.3 |
HIP 37666 |
17.40 |
| 2026-02-22 12:00 |
07:42:44.45 |
-37:57:54.4 |
HIP 37666 |
18.28 |
| 2026-02-23 00:00 |
07:42:40.67 |
-37:57:22.2 |
HIP 37666 |
19.17 |
| 2026-02-23 12:00 |
07:42:36.93 |
-37:56:49.7 |
HIP 37666 |
20.06 |
| 2026-02-24 00:00 |
07:42:33.21 |
-37:56:17.0 |
HIP 37684 |
20.41 |