메타데이터
| 항목 |
값 |
| Designation |
C/2007 E2 (Lovejoy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-03-27T12:01:31.946880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:05Z |
| Obs used |
1648 |
| NEO |
- |
| M1 |
10.300 |
| K1 |
17.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2007-05-15.0000000 |
| e |
0.99917565 |
| q (au) |
1.092938 |
| a (au) |
1325.822845 |
| i (deg) |
95.882901 |
| Ω (om, deg) |
232.431837 |
| ω (w, deg) |
340.533777 |
| M (ma, deg) |
0.000990 |
밝기
산란 + 전체 선형
$$
M_a = (14.262 + 3.304\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.262 |
| n |
3.304 |
| gf |
1.000 |
| gb |
-0.728 |
| k |
0.800 |
| 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 |
| 2007-03-27 |
2007-08-23 |
+7.4238 |
-2.181 |
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 |
02:50:27.68 |
+56:21:14.6 |
HIP 13268 |
27.58 |
| 2026-07-29 12:00 |
02:50:28.49 |
+56:21:42.5 |
HIP 13268 |
28.04 |
| 2026-07-30 00:00 |
02:50:29.25 |
+56:22:10.4 |
HIP 13268 |
28.50 |
| 2026-07-30 12:00 |
02:50:29.97 |
+56:22:38.2 |
HIP 13268 |
28.95 |
| 2026-07-31 00:00 |
02:50:30.65 |
+56:23:06.0 |
HIP 13268 |
29.41 |
| 2026-07-31 12:00 |
02:50:31.29 |
+56:23:33.8 |
HIP 13268 |
29.87 |
| 2026-08-01 00:00 |
02:50:31.88 |
+56:24:01.5 |
HIP 13268 |
30.32 |
| 2026-08-01 12:00 |
02:50:32.44 |
+56:24:29.1 |
HIP 13268 |
30.78 |
| 2026-08-02 00:00 |
02:50:32.95 |
+56:24:56.7 |
HIP 13268 |
31.24 |
| 2026-08-02 12:00 |
02:50:33.41 |
+56:25:24.3 |
HIP 13268 |
31.69 |
| 2026-08-03 00:00 |
02:50:33.84 |
+56:25:51.8 |
HIP 13268 |
32.15 |
| 2026-08-03 12:00 |
02:50:34.22 |
+56:26:19.2 |
HIP 13268 |
32.61 |
| 2026-08-04 00:00 |
02:50:34.56 |
+56:26:46.6 |
HIP 13380 |
32.23 |
| 2026-08-04 12:00 |
02:50:34.86 |
+56:27:13.9 |
HIP 13262 |
31.78 |
| 2026-08-05 00:00 |
02:50:35.11 |
+56:27:41.2 |
HIP 13262 |
31.32 |
| 2026-08-05 12:00 |
02:50:35.32 |
+56:28:08.4 |
HIP 13262 |
30.87 |
| 2026-08-06 00:00 |
02:50:35.49 |
+56:28:35.5 |
HIP 13262 |
30.42 |
| 2026-08-06 12:00 |
02:50:35.62 |
+56:29:02.6 |
HIP 13262 |
29.96 |
| 2026-08-07 00:00 |
02:50:35.70 |
+56:29:29.5 |
HIP 13262 |
29.51 |
| 2026-08-07 12:00 |
02:50:35.74 |
+56:29:56.5 |
HIP 13262 |
29.07 |
| 2026-08-08 00:00 |
02:50:35.73 |
+56:30:23.3 |
HIP 13262 |
28.62 |
| 2026-08-08 12:00 |
02:50:35.68 |
+56:30:50.1 |
HIP 13262 |
28.17 |
| 2026-08-09 00:00 |
02:50:35.59 |
+56:31:16.8 |
HIP 13262 |
27.73 |
| 2026-08-09 12:00 |
02:50:35.45 |
+56:31:43.4 |
HIP 13262 |
27.28 |
| 2026-08-10 00:00 |
02:50:35.27 |
+56:32:09.9 |
HIP 13262 |
26.84 |
| 2026-08-10 12:00 |
02:50:35.05 |
+56:32:36.3 |
HIP 13262 |
26.40 |
| 2026-08-11 00:00 |
02:50:34.78 |
+56:33:02.7 |
HIP 13262 |
25.96 |
| 2026-08-11 12:00 |
02:50:34.47 |
+56:33:28.9 |
HIP 13262 |
25.53 |
| 2026-08-12 00:00 |
02:50:34.11 |
+56:33:55.1 |
HIP 13262 |
25.09 |
| 2026-08-12 12:00 |
02:50:33.71 |
+56:34:21.1 |
HIP 13262 |
24.66 |
| 2026-08-13 00:00 |
02:50:33.27 |
+56:34:47.1 |
HIP 13262 |
24.23 |
| 2026-08-13 12:00 |
02:50:32.78 |
+56:35:13.0 |
HIP 13262 |
23.80 |
| 2026-08-14 00:00 |
02:50:32.25 |
+56:35:38.8 |
HIP 13262 |
23.37 |
| 2026-08-14 12:00 |
02:50:31.68 |
+56:36:04.4 |
HIP 13262 |
22.95 |
| 2026-08-15 00:00 |
02:50:31.06 |
+56:36:30.0 |
HIP 13262 |
22.52 |
| 2026-08-15 12:00 |
02:50:30.39 |
+56:36:55.5 |
HIP 13262 |
22.10 |
| 2026-08-16 00:00 |
02:50:29.68 |
+56:37:20.8 |
HIP 13262 |
21.69 |
| 2026-08-16 12:00 |
02:50:28.93 |
+56:37:46.0 |
HIP 13262 |
21.27 |
| 2026-08-17 00:00 |
02:50:28.14 |
+56:38:11.2 |
HIP 13262 |
20.86 |
| 2026-08-17 12:00 |
02:50:27.30 |
+56:38:36.2 |
HIP 13262 |
20.45 |
| 2026-08-18 00:00 |
02:50:26.41 |
+56:39:01.0 |
HIP 13262 |
20.05 |
| 2026-08-18 12:00 |
02:50:25.48 |
+56:39:25.8 |
HIP 13262 |
19.65 |
| 2026-08-19 00:00 |
02:50:24.51 |
+56:39:50.5 |
HIP 13262 |
19.25 |