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 |
-4.3508 |
+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) |
| 2026-03-26 00:00 |
18:21:45.83 |
-23:29:59.7 |
HIP 90085 |
18.29 |
| 2026-03-26 12:00 |
18:21:45.95 |
-23:30:00.8 |
HIP 90085 |
18.26 |
| 2026-03-27 00:00 |
18:21:46.03 |
-23:30:01.8 |
HIP 90085 |
18.23 |
| 2026-03-27 12:00 |
18:21:46.09 |
-23:30:02.9 |
HIP 90085 |
18.21 |
| 2026-03-28 00:00 |
18:21:46.13 |
-23:30:04.0 |
HIP 90085 |
18.20 |
| 2026-03-28 12:00 |
18:21:46.13 |
-23:30:05.1 |
HIP 90085 |
18.20 |
| 2026-03-29 00:00 |
18:21:46.11 |
-23:30:06.3 |
HIP 90085 |
18.20 |
| 2026-03-29 12:00 |
18:21:46.07 |
-23:30:07.4 |
HIP 90085 |
18.20 |
| 2026-03-30 00:00 |
18:21:45.99 |
-23:30:08.6 |
HIP 90085 |
18.21 |
| 2026-03-30 12:00 |
18:21:45.89 |
-23:30:09.8 |
HIP 90085 |
18.23 |
| 2026-03-31 00:00 |
18:21:45.76 |
-23:30:10.9 |
HIP 90085 |
18.25 |
| 2026-03-31 12:00 |
18:21:45.61 |
-23:30:12.1 |
HIP 90085 |
18.28 |
| 2026-04-01 00:00 |
18:21:45.43 |
-23:30:13.4 |
HIP 90085 |
18.32 |
| 2026-04-01 12:00 |
18:21:45.22 |
-23:30:14.6 |
HIP 90085 |
18.36 |
| 2026-04-02 00:00 |
18:21:44.99 |
-23:30:15.8 |
HIP 90085 |
18.40 |
| 2026-04-02 12:00 |
18:21:44.73 |
-23:30:17.1 |
HIP 90085 |
18.46 |
| 2026-04-03 00:00 |
18:21:44.44 |
-23:30:18.4 |
HIP 90085 |
18.51 |
| 2026-04-03 12:00 |
18:21:44.13 |
-23:30:19.7 |
HIP 90085 |
18.58 |
| 2026-04-04 00:00 |
18:21:43.79 |
-23:30:21.0 |
HIP 90085 |
18.65 |
| 2026-04-04 12:00 |
18:21:43.42 |
-23:30:22.3 |
HIP 90085 |
18.72 |
| 2026-04-05 00:00 |
18:21:43.03 |
-23:30:23.6 |
HIP 90085 |
18.81 |
| 2026-04-05 12:00 |
18:21:42.61 |
-23:30:24.9 |
HIP 90085 |
18.89 |
| 2026-04-06 00:00 |
18:21:42.17 |
-23:30:26.3 |
HIP 90085 |
18.99 |
| 2026-04-06 12:00 |
18:21:41.69 |
-23:30:27.7 |
HIP 90085 |
19.09 |
| 2026-04-07 00:00 |
18:21:41.20 |
-23:30:29.0 |
HIP 90085 |
19.19 |
| 2026-04-07 12:00 |
18:21:40.67 |
-23:30:30.4 |
HIP 90085 |
19.30 |
| 2026-04-08 00:00 |
18:21:40.12 |
-23:30:31.8 |
HIP 90085 |
19.42 |
| 2026-04-08 12:00 |
18:21:39.54 |
-23:30:33.3 |
HIP 90085 |
19.54 |
| 2026-04-09 00:00 |
18:21:38.94 |
-23:30:34.7 |
HIP 90085 |
19.67 |
| 2026-04-09 12:00 |
18:21:38.31 |
-23:30:36.2 |
HIP 90085 |
19.81 |
| 2026-04-10 00:00 |
18:21:37.65 |
-23:30:37.6 |
HIP 90085 |
19.95 |
| 2026-04-10 12:00 |
18:21:36.97 |
-23:30:39.1 |
HIP 90085 |
20.10 |
| 2026-04-11 00:00 |
18:21:36.27 |
-23:30:40.6 |
HIP 90085 |
20.25 |
| 2026-04-11 12:00 |
18:21:35.53 |
-23:30:42.1 |
HIP 90085 |
20.41 |
| 2026-04-12 00:00 |
18:21:34.77 |
-23:30:43.6 |
HIP 90085 |
20.57 |
| 2026-04-12 12:00 |
18:21:33.99 |
-23:30:45.1 |
HIP 90085 |
20.75 |
| 2026-04-13 00:00 |
18:21:33.17 |
-23:30:46.7 |
HIP 90085 |
20.92 |
| 2026-04-13 12:00 |
18:21:32.34 |
-23:30:48.2 |
HIP 90085 |
21.11 |
| 2026-04-14 00:00 |
18:21:31.47 |
-23:30:49.8 |
HIP 90085 |
21.29 |
| 2026-04-14 12:00 |
18:21:30.58 |
-23:30:51.4 |
HIP 90085 |
21.49 |
| 2026-04-15 00:00 |
18:21:29.67 |
-23:30:53.0 |
HIP 90085 |
21.69 |
| 2026-04-15 12:00 |
18:21:28.73 |
-23:30:54.6 |
HIP 90085 |
21.90 |
| 2026-04-16 00:00 |
18:21:27.76 |
-23:30:56.2 |
HIP 90085 |
22.11 |