메타데이터
| 항목 |
값 |
| Designation |
C/2004 Q2 (Machholz) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-01-24T21:52:04.915200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:43Z |
| Obs used |
3612 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2005-03-30.0000000 |
| e |
0.99950132 |
| q (au) |
1.205042 |
| a (au) |
2416.445814 |
| i (deg) |
38.588949 |
| Ω (om, deg) |
93.622895 |
| ω (w, deg) |
19.504703 |
| M (ma, deg) |
0.000532 |
밝기
산란 + 전체 선형
$$
M_a = (4.612 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
4.612 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.921 |
| k |
0.988 |
| δ90 |
1.000 |
| 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 |
| 2004-08-28 |
2005-01-24 |
-4.3509 |
+1.375 |
| 2005-01-24 |
2006-09-09 |
-1.9949 |
+0.688 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
18:12:52.60 |
-23:38:04.0 |
HIP 89153 |
16.36 |
| 2026-07-29 12:00 |
18:12:50.12 |
-23:38:05.6 |
HIP 89153 |
15.80 |
| 2026-07-30 00:00 |
18:12:47.65 |
-23:38:07.3 |
HIP 89153 |
15.25 |
| 2026-07-30 12:00 |
18:12:45.19 |
-23:38:08.9 |
HIP 89153 |
14.70 |
| 2026-07-31 00:00 |
18:12:42.75 |
-23:38:10.6 |
HIP 89153 |
14.15 |
| 2026-07-31 12:00 |
18:12:40.32 |
-23:38:12.2 |
HIP 89153 |
13.61 |
| 2026-08-01 00:00 |
18:12:37.92 |
-23:38:13.8 |
HIP 89153 |
13.08 |
| 2026-08-01 12:00 |
18:12:35.52 |
-23:38:15.4 |
HIP 89153 |
12.54 |
| 2026-08-02 00:00 |
18:12:33.14 |
-23:38:17.0 |
HIP 89153 |
12.02 |
| 2026-08-02 12:00 |
18:12:30.78 |
-23:38:18.6 |
HIP 89153 |
11.50 |
| 2026-08-03 00:00 |
18:12:28.44 |
-23:38:20.2 |
HIP 89153 |
10.98 |
| 2026-08-03 12:00 |
18:12:26.11 |
-23:38:21.8 |
HIP 89153 |
10.47 |
| 2026-08-04 00:00 |
18:12:23.80 |
-23:38:23.3 |
HIP 89153 |
9.97 |
| 2026-08-04 12:00 |
18:12:21.50 |
-23:38:24.9 |
HIP 89153 |
9.47 |
| 2026-08-05 00:00 |
18:12:19.23 |
-23:38:26.5 |
HIP 89153 |
8.98 |
| 2026-08-05 12:00 |
18:12:16.96 |
-23:38:28.0 |
HIP 89153 |
8.50 |
| 2026-08-06 00:00 |
18:12:14.72 |
-23:38:29.5 |
HIP 89153 |
8.03 |
| 2026-08-06 12:00 |
18:12:12.50 |
-23:38:31.1 |
HIP 89153 |
7.56 |
| 2026-08-07 00:00 |
18:12:10.29 |
-23:38:32.6 |
HIP 89153 |
7.11 |
| 2026-08-07 12:00 |
18:12:08.10 |
-23:38:34.1 |
HIP 89153 |
6.67 |
| 2026-08-08 00:00 |
18:12:05.93 |
-23:38:35.6 |
HIP 89153 |
6.23 |
| 2026-08-08 12:00 |
18:12:03.78 |
-23:38:37.1 |
HIP 89153 |
5.82 |
| 2026-08-09 00:00 |
18:12:01.64 |
-23:38:38.6 |
HIP 89153 |
5.42 |
| 2026-08-09 12:00 |
18:11:59.52 |
-23:38:40.1 |
HIP 89153 |
5.03 |
| 2026-08-10 00:00 |
18:11:57.43 |
-23:38:41.5 |
HIP 89153 |
4.67 |
| 2026-08-10 12:00 |
18:11:55.35 |
-23:38:43.0 |
HIP 89153 |
4.34 |
| 2026-08-11 00:00 |
18:11:53.29 |
-23:38:44.4 |
HIP 89153 |
4.04 |
| 2026-08-11 12:00 |
18:11:51.25 |
-23:38:45.9 |
HIP 89153 |
3.77 |
| 2026-08-12 00:00 |
18:11:49.23 |
-23:38:47.3 |
HIP 89153 |
3.55 |
| 2026-08-12 12:00 |
18:11:47.23 |
-23:38:48.7 |
HIP 89153 |
3.38 |
| 2026-08-13 00:00 |
18:11:45.25 |
-23:38:50.2 |
HIP 89153 |
3.26 |
| 2026-08-13 12:00 |
18:11:43.29 |
-23:38:51.6 |
HIP 89153 |
3.21 |
| 2026-08-14 00:00 |
18:11:41.35 |
-23:38:53.0 |
HIP 89153 |
3.22 |
| 2026-08-14 12:00 |
18:11:39.43 |
-23:38:54.4 |
HIP 89153 |
3.29 |
| 2026-08-15 00:00 |
18:11:37.54 |
-23:38:55.7 |
HIP 89153 |
3.41 |
| 2026-08-15 12:00 |
18:11:35.66 |
-23:38:57.1 |
HIP 89153 |
3.58 |
| 2026-08-16 00:00 |
18:11:33.80 |
-23:38:58.5 |
HIP 89153 |
3.79 |
| 2026-08-16 12:00 |
18:11:31.97 |
-23:38:59.8 |
HIP 89153 |
4.03 |
| 2026-08-17 00:00 |
18:11:30.15 |
-23:39:01.2 |
HIP 89153 |
4.29 |
| 2026-08-17 12:00 |
18:11:28.36 |
-23:39:02.5 |
HIP 89153 |
4.57 |
| 2026-08-18 00:00 |
18:11:26.58 |
-23:39:03.9 |
HIP 89153 |
4.87 |
| 2026-08-18 12:00 |
18:11:24.83 |
-23:39:05.2 |
HIP 89153 |
5.18 |
| 2026-08-19 00:00 |
18:11:23.10 |
-23:39:06.5 |
HIP 89153 |
5.50 |