メタデータ

項目	値
Designation	292P/Li
Type	P
Perihelion (tp_cal, UTC)	2014-02-06T08:53:58.968960Z
Orbit solution date (soln_date, UTC)	2022-05-19T21:14:15Z
Obs used	498
NEO	-
M1	9.500
K1	13.500
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2009-05-04.0000000
e	0.58678712
q (au)	2.535007
a (au)	6.134869
i (deg)	24.316162
Ω (om, deg)	91.860435
ω (w, deg)	318.847932
M (ma, deg)	247.179418

等級

散乱 + 全体線形

$$ M_a = (8.075 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	8.075
n	6.000
gf	1.000
gb	-0.506
k	1.000
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
2013-05-09	2014-02-01	+14.5124	-5.970
2014-02-06	2018-04-23	-1.1227	+0.220

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)
2026-05-12 00:00	18:56:00.28	-25:19:53.3	HIP 92929	17.14
2026-05-12 12:00	18:55:53.88	-25:20:47.2	HIP 92929	18.09
2026-05-13 00:00	18:55:47.32	-25:21:41.3	HIP 92929	19.17
2026-05-13 12:00	18:55:40.60	-25:22:35.7	HIP 92929	20.34
2026-05-14 00:00	18:55:33.72	-25:23:30.3	HIP 92929	21.61
2026-05-14 12:00	18:55:26.67	-25:24:25.1	HIP 92929	22.97
2026-05-15 00:00	18:55:19.47	-25:25:20.2	HIP 92929	24.41
2026-05-15 12:00	18:55:12.11	-25:26:15.5	HIP 92929	25.92
2026-05-16 00:00	18:55:04.59	-25:27:11.0	HIP 92929	27.50
2026-05-16 12:00	18:54:56.91	-25:28:06.8	HIP 92929	29.14
2026-05-17 00:00	18:54:49.08	-25:29:02.8	HIP 92929	30.84
2026-05-17 12:00	18:54:41.09	-25:29:59.0	HIP 92929	32.60
2026-05-18 00:00	18:54:32.94	-25:30:55.3	HIP 92610	33.07
2026-05-18 12:00	18:54:24.64	-25:31:51.9	HIP 92610	31.59
2026-05-19 00:00	18:54:16.19	-25:32:48.7	HIP 92610	30.17
2026-05-19 12:00	18:54:07.58	-25:33:45.7	HIP 92610	28.80
2026-05-20 00:00	18:53:58.81	-25:34:42.9	HIP 92610	27.50
2026-05-20 12:00	18:53:49.90	-25:35:40.3	HIP 92610	26.30
2026-05-21 00:00	18:53:40.84	-25:36:37.8	HIP 92610	25.21
2026-05-21 12:00	18:53:31.62	-25:37:35.6	HIP 92610	24.26
2026-05-22 00:00	18:53:22.26	-25:38:33.5	HIP 92610	23.48
2026-05-22 12:00	18:53:12.75	-25:39:31.5	HIP 92610	22.89
2026-05-23 00:00	18:53:03.09	-25:40:29.7	HIP 92610	22.52
2026-05-23 12:00	18:52:53.29	-25:41:28.1	HIP 92610	22.39
2026-05-24 00:00	18:52:43.34	-25:42:26.6	HIP 92610	22.51
2026-05-24 12:00	18:52:33.25	-25:43:25.3	HIP 92610	22.89
2026-05-25 00:00	18:52:23.01	-25:44:24.1	HIP 92511	23.20
2026-05-25 12:00	18:52:12.63	-25:45:23.1	HIP 92511	20.89
2026-05-26 00:00	18:52:02.11	-25:46:22.2	HIP 92511	18.63
2026-05-26 12:00	18:51:51.45	-25:47:21.4	HIP 92511	16.43
2026-05-27 00:00	18:51:40.65	-25:48:20.7	HIP 92511	14.35
2026-05-27 12:00	18:51:29.72	-25:49:20.1	HIP 92511	12.47
2026-05-28 00:00	18:51:18.64	-25:50:19.7	HIP 92511	10.90
2026-05-28 12:00	18:51:07.43	-25:51:19.4	HIP 92511	9.83
2026-05-29 00:00	18:50:56.09	-25:52:19.1	HIP 92511	9.45
2026-05-29 12:00	18:50:44.61	-25:53:18.9	HIP 92511	9.86
2026-05-30 00:00	18:50:33.00	-25:54:18.9	HIP 92511	11.00
2026-05-30 12:00	18:50:21.26	-25:55:18.9	HIP 92511	12.69
2026-05-31 00:00	18:50:09.39	-25:56:19.0	HIP 92511	14.76
2026-05-31 12:00	18:49:57.38	-25:57:19.1	HIP 92314	15.28
2026-06-01 00:00	18:49:45.26	-25:58:19.4	HIP 92314	12.38
2026-06-01 12:00	18:49:33.00	-25:59:19.7	HIP 92314	9.45
2026-06-02 00:00	18:49:20.62	-26:00:20.0	HIP 92314	6.49